Question about 1996 Cadillac DeVille

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1996 cadillac deville overheat..radiator?

Ive changed water pump, and thermostat, and it still will overheat.
The car can be showing 240 degrees and i feel the air blowing off of the radiator, and it is not that hot at all.

Ive flushed the radiator, and the water comes out of all slots. So it is not clogged, and i do not lose any coolant at all. I do not have any leaks.
Ive read alot about northstar engines and head gasket, but this car has very good power and runs great. Just that it overheats overtime.
It just seems the radiator is not removing the heat from the engine.



Posted by on

  • Anonymous Aug 20, 2009

    If the catalytic converter was stopped up or bad, wouldn't i not have as much power? The car has great power. If there is not any heat being pulled from the engine and the air is cold, wouldn't that be the radiator as it is used to remove heat? Every other car blows out hot air. Also the temp showed 190 degrees, i put my finger in the coolant and it was not that hot at all.

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Check for coolant flow at the Purge line,this is a common problem on the Northstar.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.

Posted on Aug 22, 2009

  • Mark Carrington
    Mark Carrington Aug 22, 2009

    By the way, head gasket failure on the Northstar is very often misdiagnosed and is usually the result of a simple blockage as I've described.
    Also, air locks in the northstar are unlikely because it is self purging, this is what the purge line is for.

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Check to make sure your exhaust or catalytic isn't clogged. Also thinner or synthetic oil will keep engine cooler. Are you filling up coolant system completely? Once it is filled the first time, you will have to burp the radiator hose and car should be running when filling. Let fill one full time, wait and burp hose, level will go down as fluid fills engine block, then you will need to refill system again. Check to see if you have a bleeding screw for your system as well

Posted on Aug 20, 2009

  • Nate Stansfield
    Nate Stansfield Aug 21, 2009

    I would test the temp gauge to make sure it is not faulty, if you are not getting hot air either, then you may have a faulty heater core.

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