It can be your engine thermostat that is stuck fully open. Check your coolant level first, if it's not at the full mark, add some and test your heating system again.
dredzgothik answered 10 years ago
Change the thermostat and check the fluid. It will always serve you better to get a GM part when replacing a part.
I dont know how to work heat in cadillac deville 1991
1991 Cadillac DeVille Sedan FWD
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Maintenance & Repair
Why is it running hot I seen people say they change the thermostat and water pump and there's no luck wat should I do
2001 Cadillac DeVille
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Maintenance & Repair
my 1991 deville starts intermitten, it's not the battery, what could it be?
1991 Cadillac DeVille Sedan FWD
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Maintenance & Repair
some saying something a bough a shouter door under dash it started after change antifreeze I took out one gallon and replace one gallon of pure antifreeze be fore that I hade heat now it cold tell ...
Cadillac DeVille
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Maintenance & Repair
Whenever I drive I get a good 15-20 mins before my car starts over heating when it does it displays "Engine Overheating" then "Stop Engine" what's wrong I need help! -please anyone. Thanks
2000 Cadillac DeVille
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Maintenance & Repair
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