diff --git a/game/reconstructed/btl4gau2.cpp b/game/reconstructed/btl4gau2.cpp
index 9fb51f1..ace13f7 100644
--- a/game/reconstructed/btl4gau2.cpp
+++ b/game/reconstructed/btl4gau2.cpp
@@ -1411,6 +1411,21 @@ void SubsystemCluster::Execute()
 		failedState = (BTSubsystemDamageLevelOf(subsystem) >= 1.0f);
 	}
 
+	if (getenv("BT_TEMPBAR_LOG"))
+	{
+		Scalar *t  = (Scalar *)AttributePointerOf(subsystem, "CurrentTemperature");
+		Scalar *dg = (Scalar *)AttributePointerOf(subsystem, "DegradationTemperature");
+		Scalar *fl = (Scalar *)AttributePointerOf(subsystem, "FailureTemperature");
+		static int s_tbN = 0;
+		if (t != 0 && ((++s_tbN) % 30) == 0)
+			DEBUG_STREAM << "[tempbar] cluster EXECUTING "
+				<< (subsystem ? ((Subsystem *)subsystem)->GetName() : "?")
+				<< " T=" << *t
+				<< " degT=" << (dg ? *dg : -1.0f)
+				<< " failT=" << (fl ? *fl : -1.0f)
+				<< " drawState=" << GetDrawState() << "\n" << std::flush;
+	}
+
 	int state = GetDrawState();
 	if (state != previousDrawState)
 	{