Question about 1991 Cadillac DeVille

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No hot air from heater or defroster.

Car will throw heat sometimes, but not when I need it. I noticed my service A/C light comes on when I first start up and then goes out after a few minutes. Had the radiator and system flushed 12,000 miles ago. I have water with antifreeze in system. Mech. said my heater door may be sticking????. Don't know because when he checked the heater, it was working fine. Today, nothing. Any suggestions???

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  • flipm Jan 23, 2009

    We checked that. All hoses are hot to heater and such. Mech. says thermostat is good.

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Replace the thermostate

Posted on Jan 23, 2009

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My heater worked a little bit today when I had the thermostat changed but notice the fan wasn't working and that's why it did not heat the cabin. Now I notice the air compressor is coming on while the


well the ac compressor will come on if you have it in defrost mode,if heater is blowing cold ,after you just had thermostat replace ,you could possibly have air in system.now if your heater motor is not working which is called the blower motor under dash it could be the resistor that controls it also these rigs have been known for wire harness problems at heater control unit and the blower motor connector.good luck,mike

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1996 Montero Heater Blower not working


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Heater doesnt work


To troubleshoot this types of problem,click the link below :---
Car heater blowing warm, but not hot air?http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html

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Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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