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

 

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tjdpdt, 3.0L 4 Cylinder, Grand Island, NY, August 15, 2011, 05:33
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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?

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