Question about 1997 Cadillac Eldorado

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97 northstar purges coolant after 50 miles tested cooling system..... i might be crazy but this thermostat before the water pump system makes no sense i think with the restriction of water to the pump

Water plus air plus heat gets steam steam makes pressure shure to be in excess of radiator cap range?

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  • Cadillac Master
  • 21,873 Answers

Can you explain your problem more ?
The thermostat should be at the end of the upper or lower radiator hose to block flow to the radiator. The spring must be on the engine side to get the engine heat to open.

Posted on Apr 20, 2013

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Posted on Jan 02, 2017

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SOURCE: overheating

It's the head gasket. I've had all that work done and finally found out that it's the head gasket.

Posted on Aug 04, 2008

dennymulford
  • 1055 Answers

SOURCE: 96 Deville Overheating....TroubleShooting

did you run a compression check? if so and its good then you have a blockage in the water jacket
if not then you have a head gasket leaking

Posted on Feb 26, 2009

  • 2 Answers

SOURCE: 1999 Cadillac coolant leak,can not find

ok...here is my experience with our 1999 Deville. We had the same problem with ours almost 8 months until we had the coolant flushed and filled. That is when our problem reared its ugly head. As you probably already know, this Northstar engine does have well known issues with head gasket failure as well as head bolt issues and last but not least, thermostat problems. If you haven't had an "official" overheat ( not just the coolant low light, but a true blue overheat where car has safety to shut down or run on half the cylinders) you should be fine and your engine healthy enough to repair.

I would dare say it is your head gasket. The first thing you should do is pressure test your sytem, this will diagnose whether or not it is infact your head gasket. It could also be a head bolt(s) that pull from the block when car gets too hot. If either of these things are the problem, be prepared for the investment and be sure that whoever does the work on your engine knows how to diagnose whether your engine is good enough to repair. Cadillac service bulletins instruct dealerships to replace the engine in this case, but you can repair an engine that is healthy enough. It is costly and you must love your car, but if the love is TRUE, you will love it more when it is repaired.

You did mention that the oil is fine...I know you wereprobably looking for coolant.....when these head gaskets go, the coolant doesnt necessarily mix with the oil, in fact, we didnt have that problem at all. Our coolant was shooting out the tailpipe and evaporating. You could probably check your spark plugs for coolant residue, but you would have to be sure to check them all, because you will probably have the problem in only 1 cylinder. The best way to get a yes or no is the pressure test. Good Luck!

Posted on Apr 07, 2009

  • 11 Answers

SOURCE: replaced water pump. thermostat. radiator, filled

Try backflushing,if this doesn't solve the problem,..then it could be the distributor,they can make the car run hot if the are going out.

Posted on Apr 13, 2009

Kravcar
  • 192 Answers

SOURCE: 1996 cadillac deville overheat..radiator?

Check for coolant flow at the Purge line,this is a common problem on the Northstar.
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.

Posted on Aug 22, 2009

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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

My 98 deville had a cracked radiator. replaced it. all was fine till a couple weeks ago when it overheated due to coolant leak from purge tank. replaced it. no more leaks but still ran up to 140 w/ air on...


First, you must have a properly installed thermostat that is working correctly. Second, Northstar engines are notorious for air in the cooling system after draining and refilling - keep checking the purge tank level after overheating and after the cooling system cools down. Third, make sure your cooling fans are working correctly (relay, fuse, temperature sensor) - check to make sure both are running when it overheats. If all the above is correct, the problem will probably be blockage in the system (try a flush) or your water pump itself is failing.

Aug 18, 2017 | 1998 Cadillac DeVille

1 Answer

97 cadillac eldorado overflowing through overflow pipe


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(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.

Apr 11, 2010 | 1987 Cadillac Eldorado

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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

Car is overheating and at times i don't have heat. i just recently replaced thermostat before this happened


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. If the hose is still blocked, trace it back until you find the blockage.
Make sure you refill the system with a good quality LONG LIFE coolant, Dexcool was the original coolant used in the Northstar engine but there are others to choose from now, Just make sure it's the long life silicate free coolant which is designed to last 5 years or 100,000+ miles.

Dec 12, 2009 | 1997 Cadillac DeVille

4 Answers

I have changed the radiator and thermostat and water pump and it keeps running hot


THEN U MOST LIKELY HAVE A LEAKING HEAD GASKET, VERY COMMON PROBLEM ON THIS V8 NORTHSTAR ENGINE.

Nov 12, 2009 | 1998 Cadillac DeVille

1 Answer

I opened my water pump housing on my 97 deville and the water pump looks fine and turns with key. i replaced a radiator and new thermostat just want some help before spending more money.


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(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 further back until you locate the blockage.

Oct 15, 2009 | 1997 Cadillac DeVille

3 Answers

98 cadillac seville 4.6 overheating


are your fans or fan working if not it will get hot. I assume you have electric fans or fan if so make sure when it starts to overheat the fan or fans come on if not check the fuse for the fans or relay, breaker, wiring itself.

Sep 03, 2009 | 1998 Cadillac Seville

4 Answers

Coolant not circulating / fans working, water pump working and thermostat is new. Sound of water slushing in the firewall area. 1999 oldsmobile aurora 160000 miles


I assume you know that the only circulation happening unti lthe thermostat opens at its nominal temperature is through the heater core if in use. If peering into the radiator opening, you will not see more than the most minimal movement until the thermostat opens.

You may have an airlock in the system and it could be in the heater lines so if you have done a coolant change or had the system open, you need to purge the system of air.
If you have no radiator cap like many newer vehicles, this isn't as easy to accomplish. You will have to pass through several cycles of warmup and cool-down and each time refill the reservoir to the marked level with coolant mix. During this, you will have to have the heater control set to warm the interior so that the coolant is forced to circulate throughout the whole system.

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1 Answer

1993 Cadillac Eldorado overheating


I am assuming you have the Northstar engine.

Check for coolant flow at the Purge line,this is a common problem on the Northstar.
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.

Are you running it without a thermostat? If so,then strangely enough,this will cause overheating as the Northstar cooling system is different to most conventional systems and therefore will not help you diagnose the problem.

May 29, 2009 | 1993 Cadillac Eldorado

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