Question about 2001 Cadillac DeVille

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My 01 deville wont stop overheating we replaced waterpump thermostat waterpump cover and all the gaskets wat else could it b

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Check the rad and cooling fan on motor also check fan relays
make sure rad colling fins are clean if all this check out o.k.
cylinder heads may be plugged up try reverse flush if it dont help
head gaskets or heads

Posted on Apr 02, 2011

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If it is overheating, coolant coming out of tank, you may have a head gasket issue

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I'd start with replacing thermostat (that's the most common fault) Other possibilities; waterpump,leaky hose, radiator cap (not holding pressure), fan belt broken. I'd inspect for belt & leaks - if good replace thermostat.

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We put antifreeze on it, and it went right out. I put more and I drove it home. driving slowly, it started to make noise in the front, and eventually stop. is this a symptom of a blown gasket?


This car is hard to blow a head gasket but sounds like you overheated it too the point the motor stopped running, you will need to find out first what the leak was and repair it and also replace the thermostat due to overheating it, then fill with coolant and run the motor, if you have an overheating problem then have a block test done to see if the gasket let go.i ve worked on many that were overheated and they were ok, they just needed a thermostat and a waterpump that leaked or the impeller was rotted away, hope this helps.

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MY CADILLAC IS OVERHEATING I HAVE ALREADY REPLACED THE WATER PUMP AND THERMOSTAT BUT IT STILL IS OVERHEATING. I ALSO HAD A BLOWN HEAD GASKET SO I BOUGHT SOME BLUE DEVIL AND DID ALL I WAS SUPPOSE TO FOR...


BLOWN HEAD GASKET IS THE PROBLEM CANT PATCH UP WITH STOP LEAK PRODUCTS WHICH WILL STOP RADIATOR CORES AND HEATER CORES UP PROMOTING OVERHEATING.HEADGASKET LEAKS HAS TO BE FIX.IT GOING TO COST SOME MONEY.

Jun 02, 2010 | 1998 Cadillac DeVille

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99 deville head gasket leak?


A head gasket leak is usually indicated (among other things) by continous overheating of the motor, and subsequent loss of coolant.
It can also be indicated by the presence of engine combustion gas bubbles in the coolant resevoir.
Ensure the coolant system has no external leaks, such as faulty hose/s, radiator etc.

Ensure motor tune or other motor mechanical condition is not the cause of overheating.
I assume the motor is actually running hot.

Check cooling fans are operating ok (as necessary when car warms up):- if not check
1) fuse,
2) relay operation,
3) heat sensor switch.

Check/replace the thermostat,
Check the coolant pressure cap is serviceable & of correct rating,
Ensure cooling system is correctly filled, bleed off any airlocks as necessary when re-filling,
Ensure radiator hose on suction side of waterpump is not collapsing at engine revs above idle (due softening),
If the motor has been severely overheated, the head gasket could be blown - look for combustion gas bubbles in the coolant resevoir.

Sep 21, 2009 | 1999 Cadillac DeVille

1 Answer

My 1998 deville is overheating, I have had the h20 pump replaced last summer, could it be the thermostat or the headgasket? there is no leakage that I see.


I assume motor tune or other mechanical condition is not causing the problem.
Yes, the thermostat is a common cause of overheating - replace the thermostat.
Also:-
Check operation of the radiator cooling fans is ok.
Check the coolant pressure cap is serviceable & of correct rating,
Ensure cooling system is correctly filled, bleed off any airlocks as necessary,
Ensure radiator hose on suction side of waterpump is not collapsing at engine revs above idle (due softening),
Check radiator cooling core is not blocked internally or externally.
If the motor has been severely overheated, the head gasket could be blown - look for combustion gas bubbles in the coolant resevoir.

Aug 27, 2009 | 1998 Cadillac DeVille

1 Answer

2001 DTS Deville Overheating. Cant find leak. Checked waterpump and looks Ok. Only seen coolent at overflow when overheating. Cooling fans are running ok. Will try to find problem by starting by changing...


if you have a blown head gasket you would have a miss
the waterpump can look good and still be bad
after you replace the thermostate fill the radiator and leave the cap off start the car let it get too operating temp and check for flow if you have good flow shut the car off and and put a pressure terter on the raidator this will tell of and leaks

Feb 26, 2009 | 2000 Cadillac DeVille

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Water coming from engine into overflow tank


Sounds like an overheating problem, best to get it checked, maybe thermostat stuck closed, pluged radiator, head gasget, cracked head.

Feb 08, 2009 | 2000 Cadillac DeVille

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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

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