Hi All!
I have an 1984 Cadillac Fleetwood. A read the trouble codes. The is code 15. Open coolant sensor circuit.
In the diagnostic test there is -40 celsius from the CTS. And i haven't got any HEAT. The blower works, but the air is cold.
Maybe i haven't got heating because the CTS is bad? Where is the coolant temp sensor in the car?
Other: The cold air goes from the defrost intake. Both hoses are hot at the heater core. Heater valve is OK. How can I see the AIR MIX DOOR or MODE DOOR problem??? How can I diagnose this problem? In heater mode why cold air comes like defrost mode?