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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Related Questions:

1 Answer

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


The temp sensor may be going out or you may have a bad ground between the engine block and the body of the car.

Sep 11, 2014 | 1997 Cadillac DeVille

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What is the normal operating temp in cooling system of a northstar engine?


For my 1997 Cadillac Deville limousine with 4.6 L Northstar it should be 196 to 205 deg. And top out at no more than 230 deg. F. Check multispeed fans for high speed turning over and antifreeze fluid level in overflow tank. Also, check for head gasket leaks through tailpipe which will show up as steam when you start the engine.

Sep 05, 2014 | 1997 Cadillac DeVille

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Is 245 a dangerous temperature for cadillac northstar engine?


a north star engine has aluminum heads anything over 212 is not good and has the posibility of warping the heads to leak resulting in failure of engine

normal temp sholuld be about 160 +/- 10

Aug 28, 2014 | 1997 Cadillac DeVille

1 Answer

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.

Aug 28, 2014 | 1997 Cadillac DeVille

2 Answers

Temp got up to 230 on my 99 cadillac deville is that normal


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 antifreeze..you 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 culprit.....love my 99...

Mar 14, 2012 | 1999 Cadillac DeVille

1 Answer

Just bought 99 devillr 4.6 northstar drove home and smell a liitle antifreeze coolant and see small leak what could it be?temperature reads at about 95 c to 105c


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

Aug 31, 2010 | 1999 Cadillac DeVille

2 Answers

The engin running temp is 210 to 233, but the temp outside is a 103 degrees today. Is this a problem.


Most cooling fans come on at about 225 degrees. 233 is a little high, but if it comes down pretty quickly, you should be okay. You might need a coolant flush.

Jun 27, 2009 | 1996 Cadillac DeVille

1 Answer

1998 Cadillac DeVille Overheats


The cooling fans will not come on until 225 degrees. Normal temp is around 199-215. Sitting still in traffic most will inch up around 220 or so. When you turn ac on it turns the fans on and may cool down engine, Check fan operation.

Jun 16, 2009 | 1998 Cadillac DeVille

1 Answer

Car overheating, Cadillac Deville


maybe it is cloged up. also check the fans. and the thermastat. and temp sensor.

Nov 21, 2008 | 2002 Cadillac Deville

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