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Q: The passenger compartment heats up excessively through the heater system. on 1992 Porsche 968

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The insulation has been replaced but the problem persists.Blocking the heater outlets causes the engine to heat excessively.
Could it be that the heater thermostat is stuck on high?
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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