Overheating
140

Asked by Steven Mar 20, 2017 at 01:11 PM about the 2000 Cadillac DeVille Sedan FWD

Question type: Maintenance & Repair

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?

3 Answers
224,145

Rowefast answered 7 years ago

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.

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35,395

lrodri911 answered 7 years ago

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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StarXLR answered 5 years ago

Did you ever find what the problem was? I would also check both the water pump tensioner and also the purge line for any clogging. I've have seen both a clogged purge line and I've had to replace the water pump belt tensioner which caused an overheat condition.

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