BT410 Phase 5.3.12: experience gates + coolant system -- novice/expert modes REAL

The player-experience system now gates the entire heat/jam economy, verified in
BOTH directions with a one-token egg edit (TESTNOV.EGG, experience=novice):
NOVICE = 212 fire cycles all pinned at T=77, zero jams, zero shutdowns (the
heat model authentically absent); EXPERT = the full economy (duty cycles, 119
shutdowns + 2 authentic jams under forced fire). Zero Fail in both.

- BTPLAYER: the flag block renamed to its TRUE semantics (simLive @0x25c,
  heatModelOn @0x260 -- the FUN_004ad7d4 master switch, advancedDamageOn pair,
  levelFlag26c/270, experienceLevel); the ctor rows were already
  binary-accurate (nov 0000 / std 1011 / vet 1111 / exp 1101); accessors +
  [exp] sentinel.
- HeatSink::HeatModelActive() + ProjectileWeapon::LiveFireEnabled(): owner
  mech -> Entity::GetPlayerLink() -> the BTPlayer flags, NULL-permissive.
  Gates: both HeatSinkSimulation phases, every weapon fire-heat dump, and
  CheckForJam is now the AUTHENTIC form (LiveFireEnabled + heatLoad<=0
  early-outs + the minJamChance floor; the interim heat-degraded gate retired).

- THE LOAD-BEARING FIX: Mech ctor SetValidFlag(). Every 1995 entity ctor tail
  marks itself valid; ours didn't -- Entity::Dispatch routes messages to an
  INVALID entity into the deferred event queue, so the PlayerLink bind (and
  every directly-dispatched mech message) silently never landed and the gates
  read a NULL player forever.

- THE COOLANT SYSTEM (authentic bodies, byte-verified constants: HeatLoadScale
  0.002 -> heatLoad now in [0,1]; equalize eps 1e-4; draw floor/ON
  0.0025/0.003): UpdateCoolant (damage-scaled draw -- an undamaged mech leaks
  nothing), BalanceCoolant (full clamp chain from ConductHeat), DrawCoolant
  base=0 with the RESERVOIR override as THE SOURCE; Reservoir reconstructed
  (capacity overlays thermalCapacity, CoolantSimulation + the full
  InjectCoolant flush distribution, BT_FORCE_FLUSH dev hook); Condenser
  RefrigerationSimulation (massScale = (1-damage)*refrigerationFactor >= 1 --
  the heat pump that chills the bank; valveState inits 1; digit-suffix number
  fix). Deferred: AggregateHeatSink family, cockpit-button handlers
  (MoveValve/ToggleCooling/InjectCoolant), TrackSeekVoltage charge model.

Research driven by a 4-agent workflow dossier over the BT411 RE (verbatim
bodies for every function above + the egg experience plumbing).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

restoration/source410/BT/BTPLAYER.CPP

@@ -155,41 +155,51 @@ BTPlayer::BTPlayer(
 	else
 	{
 		//
-		// Master: derive the game-mode flags from the mission experience
-		// level (novice / standard / veteran / expert) and advanced-damage
-		// technician flag.  See BTPLAYER.NOTES.md for the flag mapping.
+		// Master: derive the game-mode flags from the mission experience level
+		// (the egg's per-pilot "experience" token).  The binary rows for
+		// (simLive, heatModelOn, levelFlag26c, levelFlag270):
+		// nov 0,0,0,0 / std 1,0,1,1 / vet 1,1,1,1 / exp 1,1,0,1.
+		// Standard mode is LIVE but has no heat model -- authentic.
 		//
 		Check(bt_mission);
-		switch (bt_mission->ExperienceLevel())
+		experienceLevel = bt_mission->ExperienceLevel();
+		switch (experienceLevel)
 		{
 		case BTMission::NoviceMode:
-			showDamageReceived	= 0;
-			showKills			= 0;
-			roleReturnDelay2	= 0;
-			showScore			= 0;
+			simLive			= 0;
+			heatModelOn		= 0;
+			levelFlag26c	= 0;
+			levelFlag270	= 0;
 			break;
 		case BTMission::StandardMode:
-			showDamageReceived	= 1;
-			showKills			= 0;
-			roleReturnDelay2	= 1;
-			showScore			= 1;
+			simLive			= 1;
+			heatModelOn		= 0;
+			levelFlag26c	= 1;
+			levelFlag270	= 1;
 			break;
 		case BTMission::VeteranMode:
-			showDamageReceived	= 1;
-			showKills			= 1;
-			roleReturnDelay2	= 1;
-			showScore			= 1;
+			simLive			= 1;
+			heatModelOn		= 1;
+			levelFlag26c	= 1;
+			levelFlag270	= 1;
 			break;
 		case BTMission::ExpertMode:
-			showDamageReceived	= 1;
-			showKills			= 1;
-			roleReturnDelay2	= 0;
-			showScore			= 1;
+			simLive			= 1;
+			heatModelOn		= 1;
+			levelFlag26c	= 0;
+			levelFlag270	= 1;
 			break;
 		}
-		showDamageInflicted	= bt_mission->AdvancedDamageOn();
-		roleReturnDelay		= bt_mission->AdvancedDamageOn();
-		roleClassIndex		= bt_mission->ExperienceLevel();
+		advancedDamageOn	= bt_mission->AdvancedDamageOn();
+		advancedDamageOn2	= advancedDamageOn;
+
+		if (getenv("BT_MECH_LOG"))
+		{
+			DEBUG_STREAM << "[exp] master player experience=" << experienceLevel
+				<< " simLive=" << (int)simLive
+				<< " heatModelOn=" << (int)heatModelOn
+				<< " advDamage=" << (int)advancedDamageOn << endl << flush;
+		}
 	}
 
 	killCount		= 0;
@@ -403,6 +413,12 @@ void
 	playerVehicle->Dispatch(&player_link_message);
 	playerVehicle->DispatchToReplicants(&player_link_message);
 
+	if (getenv("BT_MECH_LOG"))
+	{
+		DEBUG_STREAM << "[link] InitializePlayerLink -> vehicle playerLink="
+			<< (void *)playerVehicle->GetPlayerLink() << endl << flush;
+	}
+
 	Check_Fpu();
 }
 

restoration/source410/BT/BTPLAYER.HPP

@@ -173,24 +173,46 @@
 			suppressConsole;
 
 		//
-		// Game-mode flags derived in the constructor from the mission's
-		// experience level (novice / standard / veteran / expert) and
-		// advanced-damage technician flag.  See BTPLAYER.NOTES.md.
+		// EXPERIENCE-LEVEL game-mode flags, derived in the constructor from the
+		// mission's experience level (novice / standard / veteran / expert) and
+		// advanced-damage technician flag.  TRUE SEMANTICS (the early "display
+		// toggles" reading of this block was wrong -- see BTPLAYER.NOTES.md):
+		// binary rows for (simLive, heatModelOn, levelFlag26c, levelFlag270) =
+		// nov 0,0,0,0 / std 1,0,1,1 / vet 1,1,1,1 / exp 1,1,0,1.
+		//   simLive       -- the novice lockout: jams, searchlight, powersub
+		//                    short events (CheckForJam's LiveFireEnabled gate);
+		//   heatModelOn   -- THE heat-model master switch (HeatModelActive):
+		//                    weapon-fire heat, the heat sim, coolant, movement
+		//                    heat.  Standard mode has NO heat consequences --
+		//                    authentic, not a gap;
+		//   advancedDamageOn/2 -- the egg's technician flag (an int pair in the
+		//                    binary; NOT part of the level switch);
+		//   experienceLevel -- the raw 0..3 (the ==0 novice-lockout predicate).
 		//
 		Logical
-			showDamageReceived;
+			simLive;
 		Logical
-			showKills;
+			heatModelOn;
 		Logical
-			showDamageInflicted;
+			advancedDamageOn;
 		Logical
-			showScore;
-		Scalar
-			roleReturnDelay;
-		Scalar
-			roleReturnDelay2;
+			advancedDamageOn2;
+		Logical
+			levelFlag26c;
+		Logical
+			levelFlag270;
 		int
-			roleClassIndex;
+			experienceLevel;
+
+	public:
+		Logical
+			IsSimLive() const		{ Check(this); return simLive; }
+		Logical
+			IsHeatModelOn() const	{ Check(this); return heatModelOn; }
+		Logical
+			IsAdvancedDamageOn() const { Check(this); return advancedDamageOn; }
+
+	protected:
 
 		int
 			killCount;

restoration/source410/BT/BTPLAYER.NOTES.md

@@ -147,3 +147,17 @@ marker), zero Fail. The mech BODY is still `DoNothingOnce` (its real
 3. Score / ScoreInflicted / ScoreUpdate handlers (scoring wave); the console
    SCORE-delta flush inside PlayerSimulation.
 4. DropZoneReply respawn tail (`Mech::Reset` in-place heal/move).
+
+## Experience flags renamed to TRUE semantics (2026-07-22, Phase 5.3.12)
+
+The `show*` / `roleReturn*` block was the old "per-role display toggles"
+misread (the memory note flagged it).  Renamed + retyped to the binary truth:
+`simLive` @0x25c (novice lockout: jams/lights/powersub short events),
+`heatModelOn` @0x260 (THE heat-model master switch, FUN_004ad7d4),
+`advancedDamageOn`/`advancedDamageOn2` (the egg technician flag pair),
+`levelFlag26c` (0/1/1/0, consumer unlocated), `levelFlag270` (0/1/1/1),
+`experienceLevel` (raw 0..3).  The ctor rows were already binary-accurate.
+Public accessors IsSimLive()/IsHeatModelOn()/IsAdvancedDamageOn(); a gated
+`[exp]` sentinel prints the derived flags per master player.  Consumers:
+HeatSink::HeatModelActive() (HEAT.CPP), ProjectileWeapon::LiveFireEnabled()
+(PROJWEAP.CPP) -- both walk mech->GetPlayerLink(), NULL-permissive.

restoration/source410/BT/EMITTER.CPP

@@ -127,15 +127,19 @@ void
 	ComputeOutputVoltage();
 
 	//
-	// Dump the firing heat into our own thermal accumulator; the HeatSink step
-	// absorbs it next frame and conducts it toward the linked Condenser bank.
-	// The heat chain is 1e7-unit-native (the BT411 calibration audit): the
-	// authored heatCostToFire is the closed form's full-charge value / 1e7
-	// (PPC: 11 -> 1.1e8 units -> +632 K on its own 174000-mass sink).
-	// (PARTIAL: the (1-dF)*E*chargeRatio^2 charge-scaling joins with the
-	// electrical-charge wave.)
+	// Dump the firing heat into our own thermal accumulator, under the
+	// heat-model experience gate (novice / standard fire generates no heat --
+	// authentic); the HeatSink step absorbs it next frame and conducts it
+	// toward the linked Condenser bank.  The heat chain is 1e7-unit-native
+	// (the BT411 calibration audit): the authored EMITTER heatCostToFire is
+	// the closed form's full-charge value / 1e7 (PPC: 11 -> 1.1e8 units ->
+	// +632 K on its own 174000-mass sink).  (PARTIAL: the
+	// (1-dF)*E*chargeRatio^2 charge-scaling joins the electrical-charge wave.)
 	//
-	AddPendingHeat(heatCostToFire * 10000000.0f);
+	if (HeatModelActive())
+	{
+		AddPendingHeat(heatCostToFire * 10000000.0f);
+	}
 
 	if (getenv("BT_MECH_LOG"))
 	{

restoration/source410/BT/HEAT.CPP

@@ -19,8 +19,26 @@
 #	include <mech.hpp>
 #endif
 
+#if !defined(BTPLAYER_HPP)
+#	include <btplayer.hpp>
+#endif
+
 #include <math.h>
 
+//
+//#############################################################################
+// Tuning constants (byte-verified against the shipped image in the BT411 RE:
+// .data / literal-pool reads).
+//#############################################################################
+//
+static const Scalar HeatLoadScale		= 0.002f;	// heat-load normalising scale -> band [0,1]
+static const Scalar HeatLoadMinimum		= 0.0f;
+static const Scalar HeatLoadMaximum		= 1.0f;
+static const Scalar HeatEqualizeEpsilon	= 1.0e-4f;	// BalanceCoolant no-op band
+static const Scalar CoolantDrawGate		= 1.0e-4f;	// DrawCoolant |amount| gate
+static const Scalar CoolantDrawFloor	= 0.0025f;	// draw zero-floor + ACTIVE-off hysteresis
+static const Scalar CoolantActiveOn		= 0.003f;	// coolantActive ON threshold
+
 //
 //#############################################################################
 // Shared data support -- reuses the base Subsystem sets (no boot-critical
@@ -286,17 +304,39 @@ Logical
 
 //
 //#############################################################################
-// HeatSinkSimulation -- the per-frame thermal step (binary @004ad924).
-// Absorb the pending heat into the thermal mass, recompute the temperature and
-// the smoothed heat-load reading, conduct into the linked sink, then drive the
-// degradation / failure alarm from the authored thresholds.
+// HeatModelActive -- the heat-model master switch (binary FUN_004ad7d4):
+// owner mech -> Entity::playerLink -> BTPlayer::heatModelOn, ON only for
+// veteran / expert experience.  Standard mode has NO heat consequences --
+// authentic, not a gap.  A NULL player link (unlinked dev mech / target dummy)
+// reads ON, matching the permissive dev-rig behavior; the binary derefs
+// unguarded (a linked player always exists in pod missions).
+//#############################################################################
 //
-// PARTIAL: the heat model runs unconditionally -- the authentic gate is the
-// player experience level (HeatModelActive: novice mode disables the heat
-// model / jams; joins with the player-link accessor wave).  UpdateCoolant
-// (coolant depletion / venting) is deferred with the coolant wave; the
-// coolant level stays at capacity, which holds the conduction term at its
-// full-coolant value.
+Logical
+	HeatSink::HeatModelActive()
+{
+	Check(this);
+
+	if (owner == NULL)
+	{
+		return True;
+	}
+	BTPlayer *player = Cast_Object(BTPlayer *, owner->GetPlayerLink());
+	if (player == NULL)
+	{
+		return True;
+	}
+	return player->IsHeatModelOn();
+}
+
+//
+//#############################################################################
+// HeatSinkSimulation -- the per-frame thermal step (binary @004ad924).
+// Under the heat-model experience gate: absorb the pending heat into the
+// thermal mass, recompute the temperature and the smoothed heat-load reading,
+// conduct into the linked sink, and run the coolant draw.  The degradation /
+// failure alarm drive is OUTSIDE the gate (authentic -- with the model off the
+// temperature never moves, so the alarm just holds Normal).
 //#############################################################################
 //
 void
@@ -304,11 +344,19 @@ void
 {
 	Check(this);
 
-	heatEnergy         += pendingHeat;
-	currentTemperature  = heatEnergy / thermalMass;
-	UpdateHeatLoad();
-	pendingHeat         = 0.0f;
-	ConductHeat(time_slice);
+	if (HeatModelActive())
+	{
+		heatEnergy         += pendingHeat;
+		currentTemperature  = heatEnergy / thermalMass;
+		UpdateHeatLoad();
+		pendingHeat         = 0.0f;
+		ConductHeat(time_slice);
+	}
+
+	if (HeatModelActive())
+	{
+		UpdateCoolant(time_slice);
+	}
 
 	//
 	// Drive the degradation / failure alarm.
@@ -326,15 +374,32 @@ void
 		heatAlarm.SetLevel(NormalHeat);
 	}
 
+	//
+	// BT_HEAT_LOG: a 5-second per-sink census (temperature / coolant / load).
+	//
+	if (getenv("BT_HEAT_LOG"))
+	{
+		static Scalar censusAccum = 0.0f;
+		censusAccum += time_slice;
+		if (censusAccum >= 5.0f)
+		{
+			censusAccum = 0.0f;
+			DEBUG_STREAM << "[heat-t] " << GetName()
+				<< " T=" << currentTemperature
+				<< " cool=" << coolantLevel << "/" << thermalCapacity
+				<< " load=" << heatLoad << endl << flush;
+		}
+	}
+
 	Check_Fpu();
 }
 
 //
 //#############################################################################
-// UpdateHeatLoad -- recompute the radiated heat and feed it through the
-// 15-sample running-average filter to produce the smoothed heatLoad reading
-// (binary @004ad7f0; the HeatLoadScale / min / max shaping constants join with
-// the gauge-calibration wave).
+// UpdateHeatLoad -- recompute the radiated heat and feed the normalised sample
+// through the 15-sample running-average filter to produce the smoothed
+// heatLoad reading in the [0,1] band (binary @004ad7f0; the shaping constants
+// are byte-verified from the image).
 //#############################################################################
 //
 void
@@ -343,14 +408,25 @@ void
 	Check(this);
 
 	radiatedHeat = currentTemperature * coolantLevel;
-	heatFilter.Add(radiatedHeat);
+
+	Scalar sample = HeatLoadScale * radiatedHeat;
+	if (sample < HeatLoadMinimum)
+	{
+		sample = HeatLoadMinimum;
+	}
+	else if (sample > HeatLoadMaximum)
+	{
+		sample = HeatLoadMaximum;
+	}
+
+	heatFilter.Add(sample);
 	heatLoad = heatFilter.CalculateAverage();
 }
 
 //
 //#############################################################################
-// ConductHeat -- conduct heat into the linked sink (binary @004ad8ac).  The
-// coolant rebalance (BalanceCoolant) is deferred with the coolant wave.
+// ConductHeat -- conduct heat into the linked sink, then rebalance coolant so
+// the hotter side sheds load (binary @004ad8ac).
 //#############################################################################
 //
 void
@@ -364,6 +440,116 @@ void
 		Scalar flow = ComputeHeatFlow(other, time_slice);
 		other->pendingHeat += flow;
 		pendingHeat        -= flow;
+		BalanceCoolant(time_slice);
+	}
+}
+
+//
+//#############################################################################
+// BalanceCoolant -- move coolant between this sink and its linked sink so that
+// the hotter side sheds load (binary @004ada94).  Clamped on both ends so
+// neither sink goes below empty or above its capacity.
+//#############################################################################
+//
+void
+	HeatSink::BalanceCoolant(Scalar time_slice)
+{
+	Check(this);
+
+	HeatSink *other = (HeatSink *)linkedSinks.Resolve();
+	if (other == NULL)
+	{
+		return;
+	}
+
+	Scalar spread = radiatedHeat - other->radiatedHeat;
+	if (spread < 0.0f)
+	{
+		spread = -spread;
+	}
+	if (spread <= HeatEqualizeEpsilon)
+	{
+		return;
+	}
+
+	Scalar delta = other->radiatedHeat / currentTemperature - coolantLevel;
+
+	//
+	// Clamp delta to +/- (thermalCapacity * dt).
+	//
+	Scalar limit = thermalCapacity * time_slice;
+	if (delta < -limit)
+	{
+		delta = -limit;
+	}
+	else if (delta > limit)
+	{
+		delta = limit;
+	}
+
+	//
+	// Clamp so this sink stays within [0, thermalCapacity].
+	//
+	Scalar hi = thermalCapacity - coolantLevel;
+	Scalar lo = -coolantLevel;
+	if (delta < lo)			delta = lo;
+	else if (delta > hi)	delta = hi;
+
+	//
+	// Clamp so the other sink stays within its own [0, thermalCapacity].
+	//
+	Scalar otherLo = -(other->thermalCapacity - other->coolantLevel);
+	if (delta < otherLo)					delta = otherLo;
+	else if (delta > other->coolantLevel)	delta = other->coolantLevel;
+
+	delta = coolantFlowScale * delta;
+	coolantLevel        += delta;
+	other->coolantLevel -= delta;
+}
+
+//
+//#############################################################################
+// UpdateCoolant -- consume coolant proportional to the current load, request a
+// top-up from the central cooling system, and update the draw state machine
+// (binary @004adbf8).  The draw scales with THIS subsystem's own structural
+// damage: an undamaged subsystem leaks nothing (the coolant bars stay full on
+// a pristine mech); the draw rises only as the sink itself takes battle
+// damage.
+//#############################################################################
+//
+void
+	HeatSink::UpdateCoolant(Scalar time_slice)
+{
+	Check(this);
+
+	coolantDraw = GetSubsystemDamageLevel() * heatLoad;
+	if (coolantDraw < CoolantDrawFloor)
+	{
+		coolantDraw = 0.0f;
+	}
+
+	Scalar amount = coolantDraw * time_slice;
+	if (coolantLevel < amount)
+	{
+		amount = coolantLevel;
+	}
+	coolantLevel -= amount;
+
+	if (amount > CoolantDrawGate || amount < -CoolantDrawGate)
+	{
+		coolantLevel += DrawCoolant(amount);
+	}
+
+	//
+	// The draw state machine (hysteresis: ON above 0.003, OFF below 0.0025).
+	//
+	if (coolantActive == 0 && coolantDraw > CoolantActiveOn)
+	{
+		coolantActive = 1;
+	}
+	else if (coolantActive == 1 && coolantDraw < CoolantDrawFloor)
+	{
+		coolantActive = 0;
 	}
 }
 
@@ -403,10 +589,17 @@ Scalar
 	return equilibrium * tau * response;
 }
 
+//
+//#############################################################################
+// DrawCoolant -- ask the central cooling system for coolant and return how
+// much was actually supplied.  Base sinks supply nothing on their own; the
+// Reservoir (the coolant store) overrides this as the source.
+//#############################################################################
+//
 Scalar
 	HeatSink::DrawCoolant(Scalar)
 {
-	Fail("HeatSink::DrawCoolant -- heat.cpp not yet reconstructed");
+	Check(this);
 	return 0.0f;
 }
 
@@ -519,14 +712,41 @@ Condenser::Condenser(
 	Check(owner);
 	Check_Pointer(subsystem_resource);
 
-	valveState			= 0;
+	//
+	// The authentic ctor (binary @4ae568): the valve opens at 1, the
+	// refrigeration output rides the inherited massScale slot, and the
+	// condenser's own coolantFlowScale streams 0 (the valve recompute --
+	// BTRecomputeCondenserValves, the cockpit MoveValve wave -- assigns each
+	// condenser its share of the total valve opening).  INTERIM: flow scale is
+	// left at the inherited 1.0 until the valve-recompute wave lands -- a zero
+	// flow scale would zero the condenser->bank conduction exponent and strand
+	// the heat in the condensers with no way to reach the central sink.
+	//
+	valveState			= 1;
 	refrigerationFactor	= subsystem_resource->refrigerationFactor;
+	massScale			= refrigerationFactor;
 
 	//
-	// Condenser number from the segment-name suffix ('A' -> 1 ...).
+	// Condenser number from the segment-name DIGIT suffix ("Condenser1" -> 1;
+	// the letter form -0x40 is the GENERATOR convention).
 	//
 	const char *name = GetName();
-	condenserNumber = name[strlen(name) - 1] - 0x40;
+	condenserNumber = name[strlen(name) - 1] - '0';
+
+	if (getenv("BT_POWER_LOG"))
+	{
+		DEBUG_STREAM << "[cond] '" << GetName()
+			<< "' refrigFactor=" << refrigerationFactor
+			<< " #" << condenserNumber << endl << flush;
+	}
+
+	//
+	// Install the per-frame refrigeration Performance.
+	//
+	if (owner->GetInstance() != Entity::ReplicantInstance)
+	{
+		SetPerformance(&Condenser::RefrigerationSimulation);
+	}
 
 	Check_Fpu();
 }
@@ -546,3 +766,27 @@ Logical
 {
 	return IsDerivedFrom(ClassDerivations);
 }
+
+//
+//#############################################################################
+// RefrigerationSimulation -- the condenser's per-frame step (binary @4ae4d8):
+// recompute the refrigeration output as (1 - own structural damage) *
+// refrigerationFactor, clamped >= 1, into the inherited massScale slot -- an
+// undamaged condenser behaves refrigerationFactor-times "hotter" in the
+// conduction exchange, actively pumping heat toward the central bank and
+// chilling itself below ambient -- then run the base HeatSink step.
+//#############################################################################
+//
+void
+	Condenser::RefrigerationSimulation(Scalar time_slice)
+{
+	Check(this);
+
+	massScale = (1.0f - GetSubsystemDamageLevel()) * refrigerationFactor;
+	if (massScale < 1.0f)
+	{
+		massScale = 1.0f;
+	}
+
+	HeatSink::HeatSinkSimulation(time_slice);
+}

restoration/source410/BT/HEAT.HPP

@@ -200,6 +200,7 @@
 		public HeatableSubsystem
 	{
 		friend class Condenser;
+		friend class Reservoir;
 	//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 	// Shared Data Support
 	//
@@ -251,6 +252,14 @@
 					activePerformance = (Simulation::Performance)performance;
 				}
 
+		//
+		// The heat-model master switch (binary FUN_004ad7d4): the owning
+		// BTPlayer's heatModelOn experience flag, reached through the mech's
+		// playerLink.  ON only for veteran / expert; a NULL player reads ON.
+		//
+		Logical
+			HeatModelActive();
+
 		void
 			HeatSinkSimulation(Scalar time_slice);
 		void
@@ -259,6 +268,10 @@
 			ConductHeat(Scalar time_slice);
 		Scalar
 			ComputeHeatFlow(HeatSink *other, Scalar time_slice);
+		void
+			UpdateCoolant(Scalar time_slice);
+		void
+			BalanceCoolant(Scalar time_slice);
 		virtual Scalar
 			DrawCoolant(Scalar requested);
 
@@ -340,6 +353,26 @@
 		);
 		~Condenser();
 
+	//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+	// Per-frame refrigeration (binary @4ae4d8): the condenser actively pumps
+	// heat toward the central bank -- massScale is recomputed each frame as
+	// (1 - own damage) * refrigerationFactor, clamped >= 1, so an undamaged
+	// condenser behaves refrigerationFactor-times "hotter" in the conduction
+	// exchange and chills itself below ambient (which is what cools the
+	// weapons equalizing against it).  Damage degrades it toward a plain sink.
+	//
+	public:
+		typedef void
+			(Condenser::*Performance)(Scalar time_slice);
+		void
+			SetPerformance(Performance performance)
+				{
+					Check(this);
+					activePerformance = (Simulation::Performance)performance;
+				}
+		void
+			RefrigerationSimulation(Scalar time_slice);
+
 	protected:
 		int		valveState;
 		int		condenserNumber;

restoration/source410/BT/HEAT.NOTES.md

@@ -100,11 +100,71 @@ The weapon-side consequences are wired and VERIFIED under sustained fire:
   thermal duty cycle (fire at ~1930° → spike 2562° → shutdown → cool → refire);
   the lasers oscillate around ~2200°.
 
+## The experience gates + the coolant wave (Phase 5.3.12, 2026-07-22)
+
+**The player-experience gates are LIVE** (the workflow dossier recovered every
+body from the BT411 RE):
+
+- `HeatSink::HeatModelActive()` (binary FUN_004ad7d4): owner mech →
+  `Entity::GetPlayerLink()` → `BTPlayer::heatModelOn` — ON only for veteran /
+  expert.  Gates BOTH phases of HeatSinkSimulation (absorb/conduct AND
+  UpdateCoolant) and every weapon fire-heat dump.  Standard mode has NO heat
+  consequences — authentic.  NULL player link reads ON (dev-permissive).
+- `ProjectileWeapon::LiveFireEnabled()`: playerLink → `simLive` — 0 only for
+  novice, whose ballistics never jam.  `CheckForJam` is now the AUTHENTIC form:
+  LiveFireEnabled early-out + the `heatLoad <= 0` early-out (with the model off
+  heatLoad stays 0, so standard mode never jams either) + the minJamChance
+  floor (a veteran+ launcher carries its authored ~5% cold jam chance — the
+  interim heat-degraded gate is retired).
+- BTPlayer's flag block renamed to its TRUE semantics (simLive @0x25c,
+  heatModelOn @0x260, advancedDamageOn/2, levelFlag26c/270, experienceLevel) —
+  the ctor rows were already binary-accurate; only the names/types were the
+  old "display toggles" misread.
+
+**THE LOAD-BEARING FIX found on the way: `Mech` ctor `SetValidFlag()`.**
+Every 1995 entity ctor tail marks itself valid; ours didn't — and
+`Entity::Dispatch` routes messages to an INVALID entity into the deferred
+event queue, so the PlayerLink bind (and every directly-dispatched mech
+message) silently never landed.  The experience gates read a NULL player
+forever (permissive ON) until this one authentic line was restored.
+
+**The coolant system** (all bodies authentic from the dossier, constants
+byte-verified: HeatLoadScale 0.002 → heatLoad now lives in the [0,1] band,
+HeatEqualizeEpsilon 1e-4, draw floor 0.0025 / ON 0.003, draw gate 1e-4):
+- `UpdateCoolant` (@004adbf8): coolantDraw = own structural damage × heatLoad
+  (an UNDAMAGED mech leaks nothing — the bars stay full), drain, top-up via
+  the virtual `DrawCoolant`, and the active-flag hysteresis.
+- `BalanceCoolant` (@004ada94): full clamp chain, called from ConductHeat.
+- `DrawCoolant` base = 0; **Reservoir overrides it as THE SOURCE** (@4af3b0).
+- **Reservoir reconstructed** (@4af408): capacity overlays thermalCapacity
+  (streamed 20), squirtMass 0.5, `CoolantSimulation` + `InjectCoolant`
+  (@4aefa4, the full flush distribution: condensers → weapons → heatables →
+  master with intentional duplicate weighting, squirts only leave the tank,
+  the chill only cools).  `BT_FORCE_FLUSH=1` dev hook (the cockpit
+  InjectCoolant button joins the message wave).  Deferred: the
+  AggregateHeatSink master-bank attach + the 0.05×count capacity rescale.
+- **Condenser refrigeration** (@4ae4d8): valveState inits 1, massScale =
+  (1 − own damage) × refrigerationFactor (streamed 3.0) clamped ≥ 1 each
+  frame — the condenser pumps heat as if 3× hotter, chilling itself below
+  ambient; that chill is what cools the weapons.  INTERIM: coolantFlowScale
+  stays 1.0 (authentic streams 0 + the MoveValve/BTRecomputeCondenserValves
+  share assignment — the cockpit-button wave; zeroing it now would strand
+  condenser heat).
+
+**VERIFIED headlessly, both directions of the experience lever** (TESTNOV.EGG
+= TEST.EGG with `experience=novice`):
+- NOVICE: 212 fire cycles ALL at T=77, zero jams, zero shutdowns, coolant
+  static — the heat model authentically absent.
+- EXPERT: playerLink resolves, the full economy runs (PPC duty cycle now
+  sawing ~650-1200° — the refrigeration pump drains harder than before — 119
+  shutdowns + 2 authentic jams under forced sustained fire).  Zero Fail in
+  both.
+
 ## Still deferred
 
-UpdateCoolant / BalanceCoolant (coolant depletion + venting), the
-HeatModelOff / LiveFireEnabled experience gates (novice mode), the electrical
-charge model (TrackSeekVoltage / voltage sag / I²R), the mech-disabled halves
-of the weapon gates (damage wave), the central sink's forward-linked drain,
-Condenser MoveValve handling, jam recovery via ResetToInitialState (mission
-reset path).
+The electrical charge model (TrackSeekVoltage / voltage sag / I²R), the
+mech-disabled halves of the weapon gates (damage wave), the AggregateHeatSink
+family (the central bank's count/radiator loop + reservoir attach + capacity
+rescale + its forward-linked drain), the MoveValve / ToggleCooling /
+InjectCoolant cockpit-button message handlers + BTRecomputeCondenserValves,
+Myomers movement heat, jam recovery via ResetToInitialState (mission reset).

restoration/source410/BT/MECH.CPP

@@ -462,6 +462,16 @@ Mech::Mech(
 	//
 	SetPerformance(&Mech::Simulate);
 
+	//
+	// The entity is complete -- mark it VALID, like every 1995 entity ctor tail
+	// (CamShip / DoorFrame / DropZone / ...).  LOAD-BEARING: Entity::Dispatch
+	// routes messages to an INVALID entity into the deferred event queue, so
+	// without this the mech never receives a directly-dispatched message --
+	// the PlayerLink bind (and with it every player-experience gate) silently
+	// never lands.
+	//
+	SetValidFlag();
+
 	Check_Fpu();
 }
 

restoration/source410/BT/MECH.NOTES.md

@@ -355,3 +355,13 @@ invalidates every bucket; newest BT/BT_L4 header mtime additionally invalidates
 the game buckets) so header edits force the dependent recompiles.  CODE/ is
 immutable and needs no stamp.  When in doubt: purge `build410/obj/*` for a
 clean baseline.
+
+## PHASE 5.3.12: the missing SetValidFlag (2026-07-22)
+
+The Mech ctor tail now calls `SetValidFlag()` -- every 1995 entity ctor does
+(CamShip/DoorFrame/DropZone/...), and ours didn't.  LOAD-BEARING:
+`Entity::Dispatch` routes messages to an INVALID entity into the deferred
+event queue, so the mech never received a directly-dispatched message -- the
+PlayerLink bind silently never landed and every player-experience gate read a
+NULL player (dev-permissive heat-always-on) until this line was restored.
+Found while verifying the novice-mode heat lockout end-to-end.

restoration/source410/BT/MISLANCH.CPP

@@ -104,9 +104,13 @@ void
 	//
 	// Ballistic heatCostToFire is stored 1e7-unit-NATIVE in the stream (SRM6
 	// reads 5.06e7 = +641K on its own sink -- the same design magnitude as the
-	// PPC's +632K); dump it raw.  (The EMITTER's authored value is small and
-	// its 1e7 comes from the energy algebra -- see EMITTER.CPP.)
-	AddPendingHeat(heatCostToFire);
+	// PPC's +632K); dump it raw, under the heat-model experience gate (novice /
+	// standard fire generates no heat -- authentic).  (The EMITTER's authored
+	// value is small and its 1e7 comes from the energy algebra.)
+	if (HeatModelActive())
+	{
+		AddPendingHeat(heatCostToFire);
+	}
 
 	if (getenv("BT_MECH_LOG"))
 	{

restoration/source410/BT/PROJWEAP.CPP

@@ -27,6 +27,10 @@
 #	include <random.hpp>
 #endif
 
+#if !defined(BTPLAYER_HPP)
+#	include <btplayer.hpp>
+#endif
+
 Derivation
 	ProjectileWeapon::ClassDerivations(
 		MechWeapon::ClassDerivations,
@@ -150,9 +154,14 @@ void
 
 	// Ballistic heatCostToFire is stored 1e7-unit-NATIVE in the stream (SRM6
 	// reads 5.06e7 = +641K on its own sink -- the same design magnitude as the
-	// PPC's +632K); dump it raw.  (The EMITTER's authored value is small and
-	// its 1e7 comes from the energy algebra -- see EMITTER.CPP.)
-	AddPendingHeat(heatCostToFire);
+	// PPC's +632K); dump it raw, under the heat-model experience gate (novice /
+	// standard fire generates no heat -- authentic).  (The EMITTER's authored
+	// value is small and its 1e7 comes from the energy algebra -- see
+	// EMITTER.CPP.)
+	if (HeatModelActive())
+	{
+		AddPendingHeat(heatCostToFire);
+	}
 
 	if (getenv("BT_MECH_LOG"))
 	{
@@ -165,18 +174,39 @@ void
 
 //
 //#############################################################################
-// CheckForJam -- the heat-scaled jam roll (binary @4bbfcc):
-//     p = 0.41 * currentTemperature / failureTemperature,
-//     clamped to [minJamChance, 1.0], rolled against a uniform random.
-// A jammed launcher clears only on ResetToInitialState (mission reset).
+// LiveFireEnabled -- the "sim live" novice lockout: owner mech ->
+// Entity::playerLink -> BTPlayer::simLive, 0 only for NOVICE experience.  A
+// NULL player link reads LIVE (the unlinked dev mech / target dummy).
+//#############################################################################
 //
-// TWO interim gates stand in for deferred systems (the BT411 port hit exactly
-// this): the authentic leading gate is LiveFireEnabled() -- the player
-// experience switch (novice mode = no jams), which needs the player-link
-// accessor wave -- and the binary's own `heatLoad <= 0` early-out is trivially
-// true once the heat model runs.  Until LiveFireEnabled lands, gate the roll
-// on the sink actually being heat-degraded, so cold weapons fire reliably and
-// jams appear exactly when the heat economy says the weapon is cooking.
+Logical
+	ProjectileWeapon::LiveFireEnabled()
+{
+	Check(this);
+
+	if (owner == NULL)
+	{
+		return True;
+	}
+	BTPlayer *player = Cast_Object(BTPlayer *, owner->GetPlayerLink());
+	if (player == NULL)
+	{
+		return True;
+	}
+	return player->IsSimLive();
+}
+
+//
+//#############################################################################
+// CheckForJam -- the heat-scaled jam roll (binary @4bbfcc), AUTHENTIC form:
+// novice never jams (LiveFireEnabled); a cold heat model never jams (heatLoad
+// stays 0 with the model off -- UpdateHeatLoad only runs under the experience
+// gate); otherwise
+//     p = 0.41 * currentTemperature / failureTemperature,
+// clamped to [minJamChance, 1.0], rolled against the uniform random.  Note the
+// floor: even a cool launcher at veteran+ carries the authored minimum jam
+// chance per shot (SRM6: 5%) -- authentic pod behavior.  A jammed launcher
+// clears only on ResetToInitialState (mission reset).
 //#############################################################################
 //
 Logical
@@ -184,7 +214,11 @@ Logical
 {
 	Check(this);
 
-	if (GetHeatState() < DegradationHeat)		// interim LiveFireEnabled stand-in
+	if (!LiveFireEnabled())
+	{
+		return False;
+	}
+	if (heatLoad <= 0.0f)
 	{
 		return False;
 	}

restoration/source410/BT/PROJWEAP.HPP

@@ -80,6 +80,13 @@
 		Logical
 			CheckForJam();
 
+		//
+		// The "sim live" novice lockout (the owning BTPlayer's simLive
+		// experience flag): novice ballistics never jam.
+		//
+		Logical
+			LiveFireEnabled();
+
 	public:
 		typedef ProjectileWeapon__SubsystemResource SubsystemResource;
 

restoration/source410/BT/RESERVR.CPP

@@ -1,16 +1,301 @@
+//===========================================================================//
+// File:	reservr.cpp                                                         //
+// Project: BattleTech           Brick: Mech subsystems                       //
+// Contents: Reservoir -- the coolant store                                  //
+//---------------------------------------------------------------------------//
+// Copyright (C) 1995, Virtual World Entertainment, Inc.                     //
+// All Rights reserved worldwide                                             //
+// This unpublished sourcecode is PROPRIETARY and CONFIDENTIAL               //
+//===========================================================================//
+
 #include <bt.hpp>
 #pragma hdrstop
+
 #if !defined(RESERVR_HPP)
 #	include <reservr.hpp>
 #endif
+
 #if !defined(MECH_HPP)
 #	include <mech.hpp>
 #endif
-Derivation Reservoir::ClassDerivations(HeatSink::ClassDerivations, "Reservoir");
-Reservoir::SharedData Reservoir::DefaultData(Reservoir::ClassDerivations, Subsystem::MessageHandlers, Subsystem::AttributeIndex, Subsystem::StateCount);
-Reservoir::Reservoir(Mech *owner, int subsystem_ID, SubsystemResource *r, SharedData &shared_data)
-	: HeatSink(owner, subsystem_ID, r, shared_data)
-{ Check(owner); Check_Pointer(r); Check_Fpu(); }
-Reservoir::~Reservoir() {}
-Logical Reservoir::TestClass(Mech &) { return True; }
-Logical Reservoir::TestInstance() const { return IsDerivedFrom(ClassDerivations); }
+
+#if !defined(MECHWEAP_HPP)
+#	include <mechweap.hpp>
+#endif
+
+#include <math.h>
+
+Derivation
+	Reservoir::ClassDerivations(
+		HeatSink::ClassDerivations,
+		"Reservoir"
+	);
+
+Reservoir::SharedData
+	Reservoir::DefaultData(
+		Reservoir::ClassDerivations,
+		Subsystem::MessageHandlers,
+		Subsystem::AttributeIndex,
+		Subsystem::StateCount
+	);
+
+//
+//#############################################################################
+// The coolant store (binary ctor @4af408): CoolantCapacity overlays the
+// inherited HeatSink thermalCapacity slot; the charge starts full; the flush
+// flow scale is zero (a reservoir never conducts like an ordinary sink).  A
+// master reservoir registers the CoolantSimulation performance.
+//
+// Deferred with the AggregateHeatSink wave: the authentic master path also
+// attaches the reservoir into the central bank's radiator loop and rescales
+// the capacity by 0.05 x the bank's heat-sink count (the central sink here is
+// still a plain HeatSink, which has no count) -- until then the streamed
+// capacity is used as-is (a larger tank than authentic; noted).
+//#############################################################################
+//
+Reservoir::Reservoir(
+	Mech				*owner,
+	int					subsystem_ID,
+	SubsystemResource	*r,
+	SharedData			&shared_data
+):
+	HeatSink(owner, subsystem_ID, r, shared_data)
+{
+	Check(owner);
+	Check_Pointer(r);
+
+	reservoirAlarm.Initialize(2);
+
+	squirtEfficiency	= 0.5f;
+	thermalCapacity		= r->coolantCapacity;
+	coolantSquirtMass	= r->coolantSquirtMass;
+	coolantLevel		= thermalCapacity;
+	coolantFlowScale	= 0.0f;
+	injectAccumulator	= 0.0f;
+	reservoirAlarm.SetLevel(0);
+
+	if (getenv("BT_POWER_LOG"))
+	{
+		DEBUG_STREAM << "[resv] '" << GetName()
+			<< "' capacity=" << thermalCapacity
+			<< " squirtMass=" << coolantSquirtMass << endl << flush;
+	}
+
+	if (owner->GetInstance() != Entity::ReplicantInstance)
+	{
+		SetPerformance(&Reservoir::CoolantSimulation);
+	}
+
+	Check_Fpu();
+}
+
+Reservoir::~Reservoir()
+{
+}
+
+Logical
+	Reservoir::TestClass(Mech &)
+{
+	return True;
+}
+
+Logical
+	Reservoir::TestInstance() const
+{
+	return IsDerivedFrom(ClassDerivations);
+}
+
+//
+//#############################################################################
+// DrawCoolant -- the SOURCE (binary @4af3b0): hand out up to coolantLevel of
+// the requested amount and deduct it from the charge.
+//#############################################################################
+//
+Scalar
+	Reservoir::DrawCoolant(Scalar requested)
+{
+	Check(this);
+
+	Scalar supplied = 0.0f;
+	if (requested >= 0.0f)
+	{
+		supplied = requested;
+		if (coolantLevel < requested)
+		{
+			supplied = coolantLevel;
+		}
+	}
+	coolantLevel -= supplied;
+	return supplied;
+}
+
+//
+//#############################################################################
+// CoolantSimulation -- the registered Performance (binary @4aef78): while
+// injection is active, accumulate elapsed time and run the coolant
+// distribution.  The InjectCoolant COCKPIT BUTTON (the id-4 message handler
+// that raises the alarm) joins with the cockpit-button message wave; the DEV
+// hook BT_FORCE_FLUSH=1 raises it here so the flush machinery is exercisable
+// headlessly (one press ~4 s after the sim starts ticking).
+//#############################################################################
+//
+void
+	Reservoir::CoolantSimulation(Scalar time_slice)
+{
+	Check(this);
+
+	{
+		static int forceFlush = -1;
+		if (forceFlush < 0)
+		{
+			forceFlush = (getenv("BT_FORCE_FLUSH") != NULL) ? 1 : 0;
+		}
+		if (forceFlush == 1)
+		{
+			static Scalar armAccum = 0.0f;
+			armAccum += time_slice;
+			if (armAccum >= 4.0f && reservoirAlarm.GetLevel() != 1
+				&& coolantLevel > 0.0f)
+			{
+				forceFlush = 2;
+				reservoirAlarm.SetLevel(1);
+				injectAccumulator = 0.0f;
+				if (getenv("BT_MECH_LOG"))
+				{
+					DEBUG_STREAM << "[resv] FLUSH ON (charge="
+						<< coolantLevel << ")" << endl << flush;
+				}
+			}
+		}
+	}
+
+	if (reservoirAlarm.GetLevel() == 1)
+	{
+		injectAccumulator += time_slice;
+		InjectCoolant(time_slice);
+	}
+}
+
+//
+//#############################################################################
+// InjectCoolant -- the coolant-flush distribution (binary @4aefa4).  Walk the
+// roster gathering the flush targets in the authentic pass order -- the
+// condensers, then the weapons, then every heat sink, then the linked master
+// (the duplicate visits are intentional weighting) -- and squirt
+// (coolantSquirtMass x the target's coolantFlowScale x dt) into each,
+// crediting a negative pending-heat chill for the moved mass.  Squirts only
+// ever leave the tank; the chill only ever cools.
+//#############################################################################
+//
+void
+	Reservoir::InjectCoolant(Scalar time_slice)
+{
+	Check(this);
+
+	if (fabs(coolantLevel) <= 1.0e-4f)			// the tank is empty
+	{
+		return;
+	}
+
+	enum { kMaxWork = 96 };
+	HeatSink	*work[kMaxWork];
+	int			workCount = 0;
+	Entity		*own = (Entity *)owner;
+	int			count = own->GetSubsystemCount();
+	int			i;
+
+	for (i = 2; i < count && workCount < kMaxWork; ++i)
+	{
+		Subsystem *s = own->GetSubsystem(i);
+		if (s != NULL && s->IsDerivedFrom(Condenser::ClassDerivations))
+		{
+			work[workCount++] = (HeatSink *)s;
+		}
+	}
+	for (i = 2; i < count && workCount < kMaxWork; ++i)
+	{
+		Subsystem *s = own->GetSubsystem(i);
+		if (s != NULL && s->IsDerivedFrom(MechWeapon::ClassDerivations))
+		{
+			work[workCount++] = (HeatSink *)s;
+		}
+	}
+	for (i = 2; i < count && workCount < kMaxWork; ++i)
+	{
+		Subsystem *s = own->GetSubsystem(i);
+		if (s != NULL && s->IsDerivedFrom(HeatSink::ClassDerivations))
+		{
+			work[workCount++] = (HeatSink *)s;
+		}
+	}
+	{
+		HeatSink *link = (HeatSink *)linkedSinks.Resolve();
+		if (link != NULL && workCount < kMaxWork)
+		{
+			work[workCount++] = link;
+		}
+	}
+
+	for (int w = 0; w < workCount; ++w)
+	{
+		if (fabs(coolantLevel) <= 1.0e-4f)		// ran dry mid-pass
+		{
+			return;
+		}
+		HeatSink *sink = work[w];
+		if (sink->coolantFlowScale == 0.0f)
+		{
+			continue;
+		}
+
+		//
+		// squirt = -(squirtMass x flowScale x dt), clamped to [-coolantLevel, 0].
+		//
+		Scalar move = -coolantSquirtMass
+			* sink->coolantFlowScale
+			* time_slice;
+		Scalar lo = -coolantLevel;
+		if (move < lo)		move = lo;
+		if (move > 0.0f)	move = 0.0f;
+
+		//
+		// The heat delta riding the moved mass (computed BEFORE the level
+		// updates, as in the binary).
+		//
+		Scalar den = (fabs(sink->coolantLevel) > 1.0e-4f)
+			? sink->coolantLevel
+			: sink->thermalCapacity;
+		Scalar moved = (move < 0.0f) ? -move : move;
+		Scalar fracSink = moved / den;
+		Scalar fracRes  = moved / coolantLevel;
+		Scalar heatDelta =
+			sink->heatEnergy * fracSink
+			- heatEnergy * fracRes;
+
+		coolantLevel       += move;				// the reservoir drains (move <= 0)
+		sink->coolantLevel -= move;				// the sink gains
+		if (sink->coolantLevel >= 0.0f)
+		{
+			if (sink->coolantLevel > sink->thermalCapacity)
+			{
+				sink->coolantLevel = sink->thermalCapacity;
+			}
+		}
+		else
+		{
+			sink->coolantLevel = 0.0f;
+		}
+
+		Scalar cap = sink->thermalMass * startingTemperature;
+		if (heatDelta > cap)
+		{
+			heatDelta = cap;
+		}
+		Scalar chill = -heatDelta;
+		if (chill > 0.0f)
+		{
+			chill = 0.0f;						// the flush only ever COOLS
+		}
+		sink->pendingHeat += chill;
+	}
+}

restoration/source410/BT/RESERVR.HPP

@@ -1,19 +1,104 @@
+//===========================================================================//
+// File:	reservr.hpp                                                         //
+// Project: BattleTech           Brick: Mech subsystems                       //
+// Contents: Reservoir -- the coolant store                                  //
+//---------------------------------------------------------------------------//
+// Copyright (C) 1995, Virtual World Entertainment, Inc.                     //
+// All Rights reserved worldwide                                             //
+// This unpublished sourcecode is PROPRIETARY and CONFIDENTIAL               //
+//===========================================================================//
+
 #if !defined(RESERVR_HPP)
 #	define RESERVR_HPP
+
 #	if !defined(HEAT_HPP)
 #		include <heat.hpp>
 #	endif
+
+//#####################    Forward Class Declarations  #######################
 	class Mech;
-	struct Reservoir__SubsystemResource : public HeatSink::SubsystemResource {};
-	class Reservoir : public HeatSink
+
+//###########################################################################
+//####################   Reservoir Model Resource   #########################
+//###########################################################################
+//
+// CoolantCapacity overlays the inherited HeatSink thermalCapacity slot at
+// construction; CoolantSquirtMass is the per-second flush rate base.
+//
+	struct Reservoir__SubsystemResource:
+		public HeatSink::SubsystemResource
+	{
+		Scalar	coolantCapacity;
+		Scalar	coolantSquirtMass;
+	};
+
+//###########################################################################
+//#############################   Reservoir   ###############################
+//###########################################################################
+//
+// The coolant store: a HeatSink that holds the mech's coolant charge and
+// "squirts" it into the other sinks on demand -- it is the DrawCoolant SOURCE
+// (every sink's UpdateCoolant top-up resolves here through the virtual), and
+// the manual coolant FLUSH (the InjectCoolant cockpit button) distributes
+// charge into the condensers / weapons / heatables, crediting each a negative
+// pending-heat chill.
+//
+	class Reservoir:
+		public HeatSink
 	{
 	public:
 		static Derivation ClassDerivations;
 		static SharedData DefaultData;
-		static Logical TestClass(Mech &);
-		Logical TestInstance() const;
+
+		static Logical
+			TestClass(Mech &);
+		Logical
+			TestInstance() const;
+
+	public:
 		typedef Reservoir__SubsystemResource SubsystemResource;
-		Reservoir(Mech *owner, int subsystem_ID, SubsystemResource *r, SharedData &shared_data = DefaultData);
+
+		Reservoir(
+			Mech						*owner,
+			int							subsystem_ID,
+			SubsystemResource			*r,
+			SharedData					&shared_data = DefaultData
+		);
 		~Reservoir();
+
+	//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+	// The coolant-store interface.
+	//
+	public:
+		//
+		// The DrawCoolant SOURCE: hand out up to coolantLevel of the requested
+		// amount and deduct it from the charge.
+		//
+		virtual Scalar
+			DrawCoolant(Scalar requested);
+
+		typedef void
+			(Reservoir::*Performance)(Scalar time_slice);
+		void
+			SetPerformance(Performance performance)
+				{
+					Check(this);
+					activePerformance = (Simulation::Performance)performance;
+				}
+
+		void
+			CoolantSimulation(Scalar time_slice);
+		void
+			InjectCoolant(Scalar time_slice);
+
+	//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+	// Local Data.  The inject flag is the reservoir alarm's level (1 = flushing).
+	//
+	protected:
+		AlarmIndicator	reservoirAlarm;
+		Scalar			coolantSquirtMass;
+		Scalar			injectAccumulator;
+		Scalar			squirtEfficiency;
 	};
+
 #endif