My 2000 deville base is overheating. When it is overheating I turn the heater on
full blast. The air coming from the vents is cold, almost like I have the ac on.
What could cause this?
Low coolant, the water pump more than likely, or the thermostat. I would plan on having the water pump replaced along with the thermostat. The impeller on the water pump disintegrates so it can't circulate the coolant.
Sounds like the thermostat is stuck closed, causing the overheating problem, since water doesn't circulate through the heater core, you don't get the hot air on the heater
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