Question about 1999 Cadillac DeVille

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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 it

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  • Cadillac Master
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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.

Posted on Sep 14, 2010

  • Jonah Oneal Sep 14, 2010

    FAN RELAYS AND FUSE UNDER THE HOOD IN THE ENGINE COMPARTMENT.

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2 Answers

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 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

1 Answer

'98 cadillac northstar deville engine temp up to 240 after useing bars head gasket repair---how can this be fixed ??????


Hello: You may have a stopped up radiator. A temp sensing heat sensor will tell you. Auto Zone or advance auto. Are you sure the head gasket is not leaking? Does coolant fill up the surge tank and bubble with engine running????

Jul 30, 2011 | 1998 Cadillac DeVille

1 Answer

Why is my 2000 cadillac deville overheating but not smoking


I bought a 2000 caddy Deville off the side of the road, had a 800.00 sign on it, pullover to see it, a man came out and said he had it to four shops and they can't figure it out. gave 700.00 for it and had to tow it home., flushed radiator, heater core, and engine out, changed thermostat, checked water pump. this Northstar engine would over heat when driving it. Turned out to be the plastic cover underneith, it hooks to the front bumper and goes to the metal frame to block the wind. when it is missing, the wind blows in and back drafts the radiator so the fans can't do their job and cool the motor. a five dollar cover from the junkyard and it was fixed, crazy hu. I hope this helps someone.

Jun 27, 2011 | 2000 Cadillac DeVille

2 Answers

My 2000 cadillac deville keep running hot when i drive it.the coolant shoots out the coolant tank when i open it.i changed the radiator and the thermostat.i don't think a head is blown cause it dosen't...


OK, check that the 2 fans are turning on when it gets to operating temperature. If not, replace the 3 or so relays that control the two speed fans on your car.If that doesn't solve the problem, then you may have to buy new fan motors and also have the harness replaced if necessary to make it cool reliably.

I had this problem on a 1997 Cadillac Deville Limousine that overheated over 157 deg. F and went into its limp mode for cooling the engine off by allowing 1/2 of the cylinders to circulate fresh air into the engine in case all antifreeze would leak out or the car would overheat.

Don't run the Northstar engine too long, more than 45 min. at a time in this limp mode.

Good luck on this repair of your Northstar Engine.

Jan 02, 2011 | 2000 Cadillac DeVille

2 Answers

I have a 1999 Cadilac Deville that I replaced a


Are you sure the thermostat was in the wrong way ?.

The thermostat is located in the bottom hose unlike most conventional cooling systems.

The thermostat in the Northstar engine is a dual action device.
One end of the stem is the Thermostat(obviously) and at the other end is a spring loaded pressure valve(the thinner end).

Make sure the thermostat end is nearest the rubber hose and the pressure valve end is in towards the engine.

Also note that the cooling fans don't come on until the coolant temperature hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.

For overheating problems consider the following......

The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,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 close to the thermostat housing,the blockage may be there.

Jun 30, 2010 | 1999 Cadillac DeVille

1 Answer

How too find the thermostat on a 2000 Cadillac Northstar Engine


follow top radiator hose to engine it is located in that housing

Oct 10, 2009 | 2000 Cadillac DeVille

2 Answers

What coolant temp should i have, while driving temp gets to 222 f. is this normal?


222 is quite normal for the Northstar engine.
The cooling fans don't come on until around 225 degrees unless of course you have the air con on.

Oct 03, 2009 | 1998 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

Alternator


J,
I have a 99 and aftter posting the same question was given some bad info, at a different sight. On the 99 I found it necessary to remove the fan assemblies, drain the radiator and remove , you have to move the condensor for the A/C but it does not have to be removed. I also had to remove the upper plastic piece in the engine compartment and the lower gravel shield. After this is done you will have a clear view of the Alt., mine was the watercooled version, I also replaced all the hoses and belts while I was in there. You may want to have the Alt tested before removal this was a 2 day job in the driveway for me. Mine is also the northstar version , I believe the 2000 is the same.
CA CADDY

Dec 18, 2008 | 2000 Cadillac DeVille

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