Question about 1996 Cadillac DeVille

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I just bought Cadillac Deville 1996(northstar 4.6) today temperature starts to rising up to 233 degree.and antifreeze starts leaking. then temp. drops to 224 and now vary from 222 to 227. whats wrong?

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Of 222 to 227 is normal, but u make have a leak in the system, check the all the water house for leaks, inspect the water pump

Posted on Nov 15, 2009


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Why does my coolant temperature move randomly between 203 and 222 at different degrees?

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What is the highest temperature that a northstar engine was designed to tolerate?

Not sure what the max temp would be. Info should be in owners manual. Or get online info free at your local library, they have access to online service manuals. Sounds like you may have a bad thermostat. When replacing the rad its a good idea to replace the t/stat at the same time. Large fluctuations in temp can be caused by air in the system. Many vehicles can have a very strange procedure to make sure all the air is out of the system. If yours has you need to follow it as described, otherwise air entrapment will occur and this is one of the results.

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Make sure your engine is breathing properly, by regularly changing air filters. Flush your cooling system once each year and pressure test. There are cooling lines that cross over the rear of the engine that get corroded and may begin to weep can view these lines by removing the engine cover....if you've had a consistent odor of antifreeze after running,with no drippage evident, this area is probably the my 99...

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your gonna have to determine where the fluid is coming from look around the engine if its leaking there its the water pump if not you may have a hose gone bad or a bad heater core.

Oct 07, 2010 | 1999 Cadillac DeVille

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I just purchased a 1999 Cadillac Deville. Drove fine for a few days. Today I drove 75 MPH for 20 miles on freeway and car began to overheat. Dashboard told me to replace oil. Checked the coolant, it took 1...

When a Cadillac (Northstar) overheats, It will give the message to change the oil. If you run a Northstar and keep running it long enough it will start shutting off cylinders and stop the A/C compressor to help protect itself. In this condition I would check for a blown headgasket. Possibly your technican will find the problem. Could also be stuck thermostat, dirty radiator Thanks

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1 Answer

1998 Cadillac DeVille Overheats

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Car overheating, Cadillac Deville

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