Question about 2001 Cadillac DeVille

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Hi im a mechanic... I have a 2000 Deville with a northstar. Radiator, waterpump, thermostat, are all changed and good. There are no external leaks. I heard the Northstar motors have problems with there engines when they start overheating. I heard the head bolts start to loosen up in the head causing them to overheat. How true is that? I heard you cant do a regular headgasket job on it, you have to retap all the headbolt holes before you put the new headbolts in it. Im just tryna verify this info.

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What happens is the head gaskets shrink causing the headbolts to loose torgue, and the headbolts are of one time use, whenever you do a headgasket job you will need to replace all the headbolts with new ones. and when ever you remove a cylinder head on any engine you should always chase the bolt holes with the proper tap, then blow out the holes with compressed air, this will help to insure a more accurate torque setting on the new headbolts...

Posted on Oct 01, 2009

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3 Answers

Just bought a 2000 Cadillac deville an I drove it 5 min. and it started over heating...the previous owner put a new radiator and thermostat in and said the heads was not blown..


he could be right about the heads but he may have put the thermostat in wrong and instead of opening it is blocking the coolant flow causing the overheating
The time span quoted is about right for a thermostat to start opening

Feb 11, 2016 | 2000 Cadillac DeVille

1 Answer

How do I change out the thermostat on my 2000 deville northstar


Partially drain the radiator (drain is at the bottom on the driver's side of the radiator - you need to remove the front air deflector panel underneath the car to get at it). Remove the air cleaner assembly. Remove the outlet hose from the thermostat housing (this hose is the one attached to the top of the radiator on the driver's side - it is NOT the inlet hose which is routed across the top of the radiator). Remove the bolts holding the thermostat housing to the water pump, then the thermostat and gasket. Carefully clean off any gasket material from the water pump and housing, install the new thermostat and gasket, and reverse the procedure. Make absolutely sure you install the thermostat correctly - in must be installed in the same orientation as the old one.

Oct 06, 2014 | 2000 Cadillac DeVille

2 Answers

I have a 1997 cadillac deville and it keep over heating. i have changed the hose out twice and checked for leaks, plus i my fan is working fine...


Check the waterpump and thermostat. When the waterpump doesn't turn, engine heat is not transported to the radiator. When the thermostat doesn't open once warm the same happens - no engine cooling.

The radiator should be hot op top and cooler at the bottom. If it's cold allover then there's no cooling fluid transport

Jun 29, 2011 | 1997 Cadillac DeVille

1 Answer

Where can I find a diagram for the cooling system on a 1998 cadillac deville online? We need to know the position of the thermostat, and water pump.


Hello: I don't know of any free information unless you join a website called AllData but I can explain where the thermostat and Waterpump are located on a Cadillac Northstar engine.
Thermostat: Follow the lower radiator hose from the radiator to where it hooks to the engine. The nipple where the hose connects has 2 10mm bolt heads, remove the bolts, the thermostat is behind it, note the position it comes out so you can install the new one the same way. Waterpump is in the same area, remove the 4 10mm bolts that hold the cover of the Waterpump housing. You may have to remove a heater hose. You will have to have a special tool (can get one at Advance Auto Parts) to remove and install the new Waterpump. Both of these items are on the drivers side on the engine.

Nov 02, 2010 | Cadillac DeVille Cars & Trucks

1 Answer

Where is the hi heat sensing control to turn on the fans to the radiator located on a 2000 cadillac northstar engine , mine is turning on at 222 degrees and i think thats to high , i would like to change...


REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP TO BE ON THE SAFE SIDE.I SEEN CADILLAC RUNS A 192 TO 199 DEGREE THERMOSTAT.CADILLAC 4.6L 4.9L ENGINES ARE BIGGER THEY RUN A LITTLE HOT THAN MOST ENGINES.

Sep 14, 2010 | 1999 Cadillac DeVille

2 Answers

Where do i find the thermostat and how do i replace it on a 2001 cadillac deville


The thermostat in the northstar engine is located at the bottom radiator hose (unlike most conventional cooling systems), the hose connects into the housing where you will also find the water pump.
Remove the hose from the housing,then remove the two bolts on the flange,the thermostat can then be pulled out.
Take note of the orientation of the thermostat as you remove it.
Don't forget the new gasket, you may have to order this separately.

Mar 30, 2010 | 2001 Cadillac DeVille

1 Answer

Engine over heats 2000 cadallic deville northstar engine


flush your radiator first.with the thermostat out you should see the water moving if not bad water pump.this engine needs the thermostat to function properly and either a 50/50 coolant or straight coolant so it does not boil over.also make sure your fans are coming on

Sep 20, 2009 | 2000 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

How to replace the thermostat on 2001cadillac deville


4.6 Northstar V8. It is located on the rear of engine (driver side) in front. It is 1n the the waterpump housing cover. Remove airbox and intake tube and bottom radiator hose. 2 bolts(believe 10mm) on thermo housing. These systems are a lil finiky about air pockets....so fill slowly and let run at idle until operating temp and let cool and chk level.....fill as needed and repeat if needed.

Jul 06, 2009 | 2001 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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