Question about 1997 Cadillac DeVille

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Does my caddilac northstar overheating to 245 degrees mean that my heads are damaged?

After having my radiator replaced ...I drove the car about 4 or 5 miles and the temperature fluxuated between 212 and 226. However ...all of a sudden it started to climb to 245 when I stopped ...pulled over and shut the engine off. I then discovered that there was a small whole in the lower radiator hose ...the mechanic repaired it, and the temperature went down to 196 degrees until I drove it about a mile and it started to climb again but only between 212 and 226. I drove it home about one and a half miles ...parked it and let it set overnight. I went out this morning and started it and it ran normal with no misses. As a matter of fact; it never missed. What do I do to remedy the over heating problem? or is my engine damaged?

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  • Cadillac Master
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If the overflow tank doesn't lose fluid and there is no steam coming out of the tailpipe when running then the engine is probably okay after the short period of running hot.

Posted on Aug 28, 2014


6 Suggested Answers


6ya staff

  • 2 Answers


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Posted on Jan 02, 2017

Mr BrokRench

Mr BrokRench

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SOURCE: 1999 Cadillac Catera - 103,000 miles - cranks but no fire

Hello carol...from the symptons you describe more than likely it's the CPS (crankshaft position sensor.)
The CPS is a common problem on Cateras with these symptoms.
The sensor is a magnetic impulse type that sends a signal to the computer, the computer then triggers the fire signal. When the CPS gets weak, dirty or has low voltage the intermitten no starts occur. It will finally result in a no start at all...Please be aware that a lot of caddy dealers will and have overcharged customers for this common problem by ill advise and replaceing uneeded componets.
Good luck...i hope this helps and will fixya up.

Posted on May 22, 2009



  • 85216 Answers

SOURCE: 4.0L Northstar Engine Overheating

the useual problem with this engine is the head gasket leaking, that sounds like what is going on with your Northstar.

Posted on Aug 16, 2009

Ted Schore

  • 7353 Answers

SOURCE: our 01 devill dts is overheating new radiaor,

That car holds 8 quarts of oil. Thats why its still low. You may have head gasket problems. Find a shop that is familiar with your Northstar engine, its going to be big bucks.

Posted on Mar 11, 2010

Testimonial: "thankyou for your knowledge. I just didn't want to believe it's a head gasket. "


SOURCE: 93 Deville, 4.9L, 113k miles. I'm a decent

Now you can do the Fuel Pump

They seize up mechanically and fail

Did you drive with a fuel pressure gauge,
taped to the windshield

Got a good fuel filter

Looking won't help you

Always do some type of testing,
before replacing anything

Posted on Dec 15, 2010


Vincent G

  • 2361 Answers

SOURCE: That engine normally operates around

When was the last time you change the thermostat and do a coolant flush?
The regular schedule is every 2 years or 24,000 miles.

Do not drive the car because over heat can warp the Northstar V8 aluminum head and blow the headgasket.
Do the thermostat change + flush and fill ASAP.

Posted on Jul 28, 2011

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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

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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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I change the thermstat i change the water pump what alse would make it over heat

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Sounds like you may have a blown head gasket,white smoke is usually caused by this,driving it can cause major damage,best to have towed to a shop.

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94 Cadillac deville just stopped running suddenly. could smell fuel the past week,

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