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hot air with heater off

Jim Borkowski's Avatar
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05-09-02, 11:35 AM   #1  
Jim Borkowski
hot air with heater off

I have a 1988 Porsche 944 non-turbo. Recently hot air blows thru the vents on heavy acceleration even when the temperature setting is off. Under normal driving cool air returns. It is especially apparent when in a higher gear trying to accelerate onto an expressway. Otherwise the engine cooling system and engine performance appear normal

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Joe_F's Avatar
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05-09-02, 12:39 PM   #2  
Check for problems with the blend door/HVAC system.

Get a vacuum schematic from Porsche (it's not likely to have it in my signature file below) and test the system.

I recommend you get a schematic from Alldata.com. It's a 25 dollar yearly fee. Well worth it.

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