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Why is the temperature steady rising after thermostat and all hoses have been changed on a 99 cadillac deville 4.6 northstar engine

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  • Cadillac Master
  • 923 Answers

Maybe it's low on coolant. Maybe the radiator fan is not turning on. Maybe the new thermostat is defective or in a bind because it wasn't centered correctly in it's place.

Posted on Apr 22, 2017

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Posted on Jan 02, 2017

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SOURCE: 99 cadillac deville

hello i have a 1998 cadillac deville course. an i been having the same over heating problems with mine i been taking it to mechanics an no one seems to know even the caddy dealship its overheating i checked the termostat water pump radiator all hoses was wondring could you tell me what you did or what you are doing to fix your problems my email is teree1234@yahoo.com thank you very much

Posted on Aug 27, 2008

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SOURCE: codes po174/171 cadillac deville northstar engine

Check for vacuum leaks around the intake. This is the most common cause for these codes.

Posted on Mar 16, 2009

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SOURCE: Problem with overheating on 1996 Cadillac Deville with Northstar

The oil life resets to zero after the engine overheats. Check for external leaks first, make sure the water pump belt is still there and turning. The most likely cause if the car has over 70,000 miles is head gaskets.

Posted on May 18, 2009

Kravcar
  • 192 Answers

SOURCE: how to change starter

You have to remove the intake manifold as the starter is just underneath it.
Removing the starter itself is quite easy once you have the manifold off.

Unfortunately, removing the manifold is a right royal pain in the back side!!!.
I can list the removal procedure as per the factory workshop manual if you wish?.
The good news is that you do not need to work under the car,everything is done on top.

Posted on Oct 15, 2009

  • 1608 Answers

SOURCE: where is the knock sensor located

The knock sensor is located under the intake manifold.The starter is also located under the intake manifold.Hope this helps.Good luck.

Posted on Jul 21, 2010

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2 Answers

Temp got up to 230 on my 99 cadillac deville is that normal


Make sure your engine is breathing properly, by regularly changing air filters. Flush your cooling system once each year and pressure test. There are cooling lines that cross over the rear of the engine that get corroded and may begin to weep antifreeze..you can view these lines by removing the engine cover....if you've had a consistent odor of antifreeze after running,with no drippage evident, this area is probably the culprit.....love my 99...

Mar 14, 2012 | 1999 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

I have a 97' cadillac Deville. I found the thermostat in the lower hose just below the upper hose. Is it suppose to be in the upper? Is there a certain orientation for the new thermostat?


The thermostat in the Northstar is in the lower hose as you have stated.
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.
The cooling system in the Northstar does not work like the older,conventional systems, this is why most people are confused when they find the Thermostat in the lower hose.

Apr 14, 2010 | 1997 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

1 Answer

Need to locate where my 2001 cadillac deville thermostat Car is not overheating but is running hot not all the time I want to change my thermostat


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.


Overheating........

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.

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.


Nov 05, 2009 | 2001 Cadillac DeVille

2 Answers

No heat on my 98 caddy deville delegance?


do the heater core coolant supply hoses both get hot at the firewall in the engine compartment? if yes then you have a defective temperature control blend door actuater motor.

Oct 17, 2009 | 1998 Cadillac DeVille

2 Answers

Need to know where the thermostat is on my 99 deville


Hi,
The thermostat is located in a housing attached to your engine, where the top radiator hose is connected to that housing.
I hope this helps...

Oct 16, 2009 | 1999 Cadillac DeVille

2 Answers

Diagram of cadilac northstar engine exploded view of a cadilac northstar engine


need 1998 northstar engine diagram to change the head gasket thanks

Sep 30, 2009 | 2001 Cadillac DeVille

1 Answer

Whta size thermostat for a 97 northstar engine?


Your engine is a 4.6 liter 281 CID V8.

There are thermostat rated for 180f or 195f for your engine,

I will select a 195f thermostat with a pressure relief poppet/valve to protect the coolant hoses.





Jul 17, 2009 | 1997 Cadillac DeVille

3 Answers

99 cadillac deville


hello i have a 1998 cadillac deville course. an i been having the same over heating problems with mine i been taking it to mechanics an no one seems to know even the caddy dealship its overheating i checked the termostat water pump radiator all hoses was wondring could you tell me what you did or what you are doing to fix your problems my email is teree1234@yahoo.com thank you very much

Aug 02, 2008 | 1999 Cadillac DeVille

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