Question about 1999 Cadillac DeVille

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HEATER REPAIR I RECENTLY REPLACE BOTH MY RADIATOR AND THERMOSTAT TRYING TO RESOLVE THE HEATING PROBLEM WITH MY CADILLAC. TO MY SURPRISE THE HEAT STILL DOES NOT WORK PROPERLY. I DONT THINK IT IS THE HEATING CORE BECAUSE FROM MY PERSONAL EXPEIRENCE THAT NORMALLY MAKES A MESS ON THE FLOOR BOARD. MY TEMPERATURE RISES REALLY FAST ALSO. I CAN BE DRIVING AT 20 TO 30 MPH AND IT RUNS UP TO 240 OR 250'S REALLY QUICK. PRIOR TO MY HEATING PROBLEM I NEVER SEEN IT THAT HIGH. I REALLY NEED TO TAKE CARE OF THIS ISSUE AS QUICK AS POSSIBLE. I AM IN ALASKA NOW AND THE WINTERS HERE TAKE NO PRISONERS. ANY KIND OF INFORMATION OR ASSISTANCE YOU CAN PROVIDE WILL BE GREATLY APPRECIATED. THANK YOU FOR YOU TIME

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  • lilgooberj Dec 07, 2008

    I have no heat at all either! And i live in MN, is there a way to test the thermostat before replacing? 1988 Deville.

  • Anonymous May 20, 2009

    I have a 1998 Cadillac DeVille and having heating problems as well, I replaced the thermostat but it keeps overheating, the fans will start at 222 F, but the temp will continue to rise until 260 F! any help would be greatly appreciate.

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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

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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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