Question about 1999 Cadillac DeVille
Check your cooling fans. relays power and ground the wuickest easiest way is to turn on your ac if your ac system works the fans should kick on when the ac compressor comes on. also check your coolant there is a tool that you can pick up at the parts store for a few bucks. your coolant helps heat and cool your engine if the mixture isn't right the engine could overheat or possible freeze if the temps dip. also check the waterpump look for small amouts of coolant dripping or a sweet smellwhen inside the car.
Posted on Jul 26, 2009
Chances are it is your heater core , it don't have to leak just get stopped up . it has tiny vanes and the antifreeze has to run through them. I know the your heater hoses outside on the motor are different sizes but switch places with these two hoses connected with heater core it will change the flow direction and chances are unplug it.
God Bless Greg
Posted on Dec 02, 2008
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