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Northstar v-8 thermostat

Location and replacement of thermostat

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Follow the upper radiator hose back to the engine. Where the hose connect on the engine there should be a housing that contains your thermostat.

Posted on Feb 12, 2012

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HOW DO i REPLACE THERMOSTAT 1997 CADILLAC DEVILLE?


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.
If you still wish to replace the stat...
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.

You will need to remove the air filter housing and air duct to gain easy access to the thermostat.

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.

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.

Feb 14, 2015 | 1997 Cadillac DeVille

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

Need to replace thermostat, and new radiator cap. Have any instructions?


Assuming you have the Northstar engine.....

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.

You will need to remove the air filter housing and air duct to gain easy access to the thermostat.

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.

The thermostat in the Northstar engine is a duel 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.

Don't forget the new gasket when you install your new stat, you may have to order this separately.

There is no radiator cap.The only cap is on the purge tank and these are quite cheap to buy and easy to replace.

Jun 14, 2010 | 1996 Cadillac DeVille

3 Answers

98 Cadillac Northstar motor running hot in 30 min.


The normal operating temperature for the Northstar engine is around 210 degrees.
The fans will not come on until the temp hits 225 degrees.

The thermostat in the northstar engine is located at the bottom radiator hose (unlike most conventional cooling systems).

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 to near the thermostat housing,the blockage may be there.

If the other end of your purge line is not connected to anything then that is the problem......it must be reconnected otherwise the cooling system is not pressurized.

Apr 19, 2010 | 1998 Cadillac DeVille

1 Answer

Need to locate the thermostat for replacement. where is it?


The thermostat is located on the drivers side,In front of the belt driven water pump.If you havent had much experience with the northstar engine you may wanna have a repair shop replace it.

Jan 29, 2010 | 1998 Cadillac DeVille

1 Answer

Replacing the thermostat on a cadillac deville


Assuming you have the Northstar engine....

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 when you install your new stat.

Jan 12, 2010 | 1995 Cadillac DeVille

3 Answers

Need the firing order for a 2004 Cadillac v8 northstar


This should be the firing order;
2004 Northstar RWD/AWD 4.6L V8 (LH2) ... Firing Order: 1-2-7-3-4-5-6-8
Please be sure that when you list your questions on auto's be more precise on info provided. Sometimes listing the Vin Engine number helps to to locate info. Good Luck!

Aug 28, 2009 | 2004 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

2 Answers

AM TRYING TO LOCATE THE THERMOSTAT IN MY 2001 CADILLAC SEVILLE


Your car probably has the 4.6 northstar. If this is the case the thermostat is in the water pump housing at the drivers side of the engine. follow the lower rad hose to the pump housing and its contained in a black (2 bolt 10 mm) housing.

May 04, 2009 | 1998 Cadillac Seville

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