Question about 1995 Cadillac DeVille
I just did a FREE write up on air purge from coolant system,low to no heat and how to
detect initial state of blown head gasket at the Fixya tip selection.
or follow link below.
Posted on Dec 06, 2009
Check the heat temp. control pot under the hood inline on one of your heater hoses, it may be stuck. there should be a small lever sticking out of it that you should be able to move with minimal resistance. if it is sticking you can prolly free it by using p.b lube and gently working it back and forth. if it is not stuck check the vacuum hose going into it by having someone in the car adjust the temp selector from cold to hot and back a few times while you block the end of the hose with your finger, you should be able to feel the suction when the selector is moved. if not,the vacuum line may be dryrotted wich should be fairly easy to check visually, barring these two things either the switch is defective or your coolant level is too low to push adaquite hot water thru the heater core, make sure coolant level is proper, if it is then the switch most likely is bad
Posted on Nov 14, 2009
The heater valve which located behind the dash is not open fully to allow hot antifreeze from the engine to flow fully to the heater core. the heater valve tend to go bad over year due to exposure to heat. the inner valve made of hard rubber, is either seized some what partial way and the valve is not open fully. the heater valve is fairly cheap to replace however to get to it is a task which tearing the dash apart.
Posted on Nov 14, 2009
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Posted on Jan 02, 2017
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