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Q:

No HEAT on 1992 Cadillac DeVille

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Air works great but now that cold weather is here I have no heat. Could it be the thermostat or the temp sensor switch?
(2) Answers
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Start by checking engine temperature - see if it gets actually hot. Check the inlet and outlet hoses of the heater core - scalding hot, or just warm? If they are both scalding hot, then you are looking at a temperature control issue inside the car.
Thanks Dave I'll look at this.
actuater is bad