Question about 1997 Cadillac DeVille

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97 Cadillac deville only overheats on hills it has a new radiator, water pump and rad cap. it runs fine on flat roads and at idle rad fans kick on about 222 degrees.

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  • Anonymous Mar 07, 2010

    no i have not had the exhaust checked and no there is no slipping in the tranny and rpms are normal

  • Anonymous Mar 07, 2010

    i have not had any exhausts checks yet

  • Anonymous Mar 08, 2010

    It seems to have been the tranny fluid It was Low which ticks me off since i just had it in for a full service oil change, and that should have been checked. I filled the tranny fluid and so far she is running great and not going above 222 on the hills. I might try to find a Bigger hill around here to test her on though. Thanks for the help guys.

  • Mike Butler
    Mike Butler May 11, 2010

    Have you had it checked for possible exhaust restriction, such as catalytic converter?

  • charlie230 May 11, 2010

    DO U FEEL ANY SLIPPING OF TRANNY ON HILLS? DOSE UR RPM CLIME HIGHER THAN NORMAL?

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The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
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.Or trace the hose back until you find the blockage.The hose goes in to the engine to a crossover and comes out the other side to near the thermostat housing,the blockage may be there.

Posted on Mar 09, 2010

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There's a few things I'd take into consideration. As stated in other posts, yes make sure transmission fluid is up to proper level. Also, depending on what engine you have, there may be an electric assist pump or even 2 in the system. On some, they have an electric pump to circulate coolant through heater core at idle to maintain proper heat , as well as another to assist mechanically driven pump when coolant temperature gets to approx 195F. Obviously when going up hills there is an added continuous load on engine, which will cause it to run hotter, thus I would expect that electric pump to be kicking in, and if not, may be the cause. Also the added load of climbing hills, creates added exhaust temperature, and if there is any restrictions, the results would be overheating. Quite often you may feel at least a little lack of power compared to what it used to be, or an increase in fuel consumption, or both when exhaust has a restriction. With that said, a weak water pump is also a possibility. Hope this sheds some light on what to pay attention to.

Posted on Mar 07, 2010

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I'd check the transmission fuild level.

Posted on Mar 06, 2010

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1 Answer

What can i do my 97 cadillac deville overheats changes thermostate, water pump, radiator and coolant what do i do next?


Check that two fans are turning on when you turn the a/c on or when it gets to 222 deg. F according to the gauge, and shuts off when it gets down to 212 deg. F.

May have a problem with relays, wiring contacts at the relays, fuse, or the relays themselves. Also, the fans on Cadillac Devilles from 1997 have multiple speeds depending on demand for cooling.

In summary, I would check fans.

Jul 29, 2012 | 1997 Cadillac DeVille

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Overheating can be numerous things: Fans not working, water pump, thermostat, overflow cap, and the list keeps going. When the engine is running and heats ups, feel the heat of the top hose, if the hose isn't hot, the thermostat is most likely stuck open and needs replaced. If it is hot we know you have circulation. The cap on the expansion tank may be defective, if it can't hold the pressure of the water, it will release at the overflow cap if the cap is bad. Also check the coolant level.

Jan 30, 2010 | 1997 Cadillac DeVille

1 Answer

I have a 1992 cadillac deville.i have a problem with the water going from radiator to the water reservior after it driven for awhile.what could the problem be?


This is normall oppertion, as the coolant heats up it expands just like water in a pot on the stove will boil over, hence the reson for the tank to catch it and return it to the radiator as it cools down. Now, if your coolant is not being returned to the radiator when it cools down you will most likely need a new rad cap.

Aug 27, 2009 | 1992 Cadillac DeVille

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4.6 lit cadillac overheats although I replaced the thermostat


did you try replacing the radiator cap and the temp sensor?

Mar 31, 2009 | 1997 Cadillac DeVille

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2001 Cadillac Deville coolant bleed screw Location??


I had the same problem with my 2001 Cadillac Deville, like you I had replaced literally everything thermostat, water pump, radiator, temperature sensor, reservoir and cap, hoses etc....I didnt have any leakage. I was told I had air in my coolant system. After a lot of research and running across the right mechanic I was able to locate the bleeder and remove the air from my lines. No problem since. The bleeder is located on yhe left side of the radiator on the crossover, mines was sideways..Hope this helps someone before they spend money for new head gasket problems..Try this it helped me....

Mar 25, 2009 | 2001 Cadillac DeVille

2 Answers

I HAVE A 1999 DEVILLE


99 cadillac deville overheating put in new radiator,thermostat,waterpump. it stays cool at idle for a hour running.drivin about 15-30 minutes it overheats. is not using hardly any coolant to speak of.

Jan 05, 2009 | 1999 Cadillac DeVille

2 Answers

I have a 2000 cadillac deville


You can rent a cooling system preasure tester at a parts store. These engines run so close to boiling that they must be able to hold presure or they overheat. Presurize the system and check for even the smallest leaks at all hose connections. I fought this problem for a long time before I figured it out.

Oct 14, 2008 | 1999 Cadillac DeVille

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