Question about 2000 Cadillac DeVille

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2001 DTS Deville Overheating. Cant find leak. Checked waterpump and looks Ok. Only seen coolent at overflow when overheating. Cooling fans are running ok. Will try to find problem by starting by changing thermostate. Dont know if head gazett are blowen., but not getting any white smoke.

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  • erlelia Feb 26, 2009

    Thanks for the advise. I will try it. Can not find a cap on the rad. on this car. only the reserve tank has a pressure cap.

  • erlelia Feb 27, 2009

    Changed thermostat today and still overheats. Pressure cap was tested and is ok. How do you test for coolent gases in the system ?

  • bambam73 Apr 09, 2009

    2000 Deville Overheating. Cant find leak. Repleced waterpump and thermostate. Only seen coolent at overflow when overheating. Cooling fans are running ok. Dont know if head gasket are blowen., but not getting any white smoke from the tailpipe.

  • Anonymous Apr 29, 2009

    same problem. losing collent. and over heating. no leak found. dont want to accept that its a head gasket.

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If you have a blown head gasket you would have a miss
the waterpump can look good and still be bad
after you replace the thermostate fill the radiator and leave the cap off start the car let it get too operating temp and check for flow if you have good flow shut the car off and and put a pressure terter on the raidator this will tell of and leaks

Posted on Feb 26, 2009

  • barryerick Jan 21, 2011

    On a northstar it is possible to not have coolant enter the combustion chamber due to the design of the head. In fact, it is quite common. This is likely (99%) a bad head gasket. This is condition that is unique to the northstar, no a non-northstar expert would not know this.

  • BeenThereMan Aug 12, 2011

    No doubt it's the head gasket. The N* head leak will pressurize the cooling system with combustion gasses causing an air locked water pump which causes overheating. Purge air from the system and with engine running and res cap off, check the coolant and you will see it bubbling from combustion gasses. If the res cap is just left loose on the res- do not turn it, but just set it in the openning- air will escape without pressurizing the system and you will see the engine will operate normally except under high temp, high altidude, or steep grade driving. Spent thousands fixing it once and failed again. been driving almost 2 years with cap loose and only problem was 100+ degree day at end of 8 hr drive to the Black Hills, SD. Takes a long time to cool back down to purge the air and fill with coolant at 100 degrees air temp!

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