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The temperature in our 1998 Cadillac Deville goes very high and it has overheated 2 times? We already had the thermostat replaced?

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  • olwork
    olwork May 11, 2010

    Under what conditions? Does it do it rather quickly or gradually, such as under load (as a long, steep hill) or only on very hot days?

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  • Cadillac Master
  • 6,826 Answers

Check for air in system(cooling system) also check to see if cooling fans on radiator come on when car reaches about 225-230degrees, if not check relays and fans to see if they ar good if so see if both of them work (they should) if they both come on see if they go off if they dont ever go off then the engine is not cooling down have a tech. check it out ,could be a blown head gasket or worse

Posted on Jun 28, 2009

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1996 Cadillac Deville overheating. Bought a new coolant temp sensor. Need to know location of it. Thanks!


Not sure of the location of it. Usually they are in the thermostat housing or on the top of the engine. Maybe on one side of a cylinder head. You may also replace the thermostat itself and make sure your cooling fans are working properly

Oct 02, 2010 | 1998 Cadillac DeVille

1 Answer

What is considered the overheating temerature for a 1998 cadillac sedan deville?


I believe that if it goes above 260 deg. it will go into a safe mode for the engine where the cool air is pumped into 1/2 of the cylinders to keep it cooler.

If it gets to 220 or 230 deg. F, it's ok.

Aug 29, 2010 | 1998 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

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

1 Answer

Thermostat replacement how easy is it on a 1998 cadillac deville 4.6l sfi dohc 8 cyl


Thermostat replacement is relatively easy for an experienced technician. However, it's harder than a 2 bolt change found on older classic cars.

It is located in a thermostat housing on the left side of the engine.

Look to see if you can do this one.




Apr 06, 2010 | 1998 Cadillac DeVille

4 Answers

1998 Cadillac Deville overheating . Engine overheats to 245 + degrees when running 50 mph or more with some torque load.( ie.hills and 4 passengers) New thermostat and coolant reserve pressure valve.were...


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.

Mar 15, 2010 | 1998 Cadillac DeVille

2 Answers

Why does my cadillac 1998 deville keep overheating?


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

2 Answers

1998 cadillac deville fans not coming on starts


If your fans are not coming on then your engine is not receiving the signal that it is overheating. This can be caused by bad fans (unlikely they are both out) a bad relay, or coolant temperature sensor. I would start by checking or replacing the temperature sensor as it can become corroded which is what the PCM uses to turn the fans on. Many vehicles use two sensors, one for the gauge and the other for the ECU, make sure you check/replace the right one. It should be a cheaper part and if you are unsure then match the new one with its location; it should be on the intake manifold or near it, generally with one or two wires. I think you will find your problem as they are common failed parts.

Good luck!

Aug 30, 2009 | 1998 Cadillac DeVille

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