No HEAT on 1992 Cadillac DeVille

Air works great but now that cold weather is here I have no heat. Could it be the thermostat or the temp sensor switch?

by in El Paso, TX on January 06, 2011
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2 answers 1 comment
ANSWER by , January 06, 2011
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.
COMMENT by , January 07, 2011
Thanks Dave I'll look at this.
ANSWER by , February 26, 2013
actuater is bad