Question about 1998 Oldsmobile Aurora

3 Answers

Cooling system purge info overheating cooling tank boiling when turn off. replaced thermastat but fans acting funny sometimes 225 before turn on. stop leak was added before problem started. tried to flush couple diffrant times out pug on bottom of radiator and coolent tank hose and through therm. opening ete. but still heating up from norm. of 190 to 225to250. Need info on location of sensor for fan relay so i can clean off the stop leak on the sensor/thinking that will help/what do you think?

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  • Oldsmobile Master
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The biggist problem is most likely the cooling system needs bleeding to purge the air out of the cooling system.To do this,the easy way,is to start this with the car cold.Remove the reservoir cap and fill it full,past the full mark.Wait to see if the coolant level drops.Then refill to the top.Replace the cap,and start the engine,and let it run up to about 218 to 220,and shut the engine off(do not turn ac on,make sure it is off).Wait about 45 minutes,and look at the reservoir level,it should have dropped.If so refill the reservoir,and repeat these steps until the cooling fans come on at about 215 or so,and they go back off by themselves.Keep check on the reservoir for a day or so to make sure that the reservoir does not drop to low,the level will finally set.If I can help,let me know.>>>roniecon@gmail.com

Posted on Sep 24, 2009

Testimonial: "thanks for your help! two brass screws 7mm the location of bleeders do you have any idea"

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Sep 24, 2009

    The biggist problem is most likely the cooling system needs bleeding to purge the air out of the cooling system.To do this,the easy way,is to start this with the car cold.Remove the reservoir cap and fill it full,past the full mark.Wait to see if the coolant level drops.Then refill to the top.Replace the cap,and start the engine,and let it run up to about 218 to 220,and shut the engine off(do not turn ac on,make sure it is off).Wait about 45 minutes,and look at the reservoir level,it should have dropped.If so refill the reservoir,and repeat these steps until the cooling fans come on at about 215 or so,and they go back off by themselves.Keep check on the reservoir for a day or so to make sure that the reservoir does not drop to low,the level will finally set.If I can help,let me know.>>>roniecon@gmail.com PS THERE ARE BLEEDER SCREWS,BUT THE EASIEST WAY OF DOING TIS IS THE DIALOG I CREATED,iT WORKS EVERY TIME TRY IT .IT ACTUALY TAKES LESS TIME AND CONFUSION OUT OF BLEEDING THE SYSTEM

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  • Expert
  • 173 Answers

HI" this cars have two bleeders made from brass they are 7mm screws loosen the and ad your coolant you will see some air com out this is done whit engine off.ok ,if your problem persist its most likely head gasket.

Posted on Sep 24, 2009

Testimonial: "where are these screws my friend"

  • jesus Rojo Sep 25, 2009

    HI here are the area

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  • Master
  • 432 Answers

Never use stop leak in a cooling system now you have to have it flushed which was probably the problem to begin with

Posted on Sep 24, 2009

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1 Answer

98 deville 32 valve North Star OVERHEATS after 33 miles of drive ?? does not overheat in town overheats out on highway and after slowing down- fans dont cool motor unless stop engine ,have changed radiator...


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.

Jul 14, 2010 | 1998 Cadillac DeVille

1 Answer

Cadilac deville 2001 runs hot when you get into stop and go trffic.


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.


Jul 02, 2010 | 2001 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

Engine overheating in 1999 Cadillac Deville. Cooling fan not coming on but does kick in when A/C is on. This is my Mom's car and I need help


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.

May 26, 2010 | 1999 Cadillac DeVille

1 Answer

What is the correct temp on a 1998 Cadillac de ville my cadillac is not should me the correct temp in my gate and is overheating.


The normal coolant temp should be around 200-215 degrees.
The cooling fans will come on at around 225-228 degrees.

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.

May 12, 2010 | 1998 Cadillac DeVille

1 Answer

My es 300 is overheating, and bubbling but then on the next day its fine, what could be causing this just had thermastat replaced


MAKE SURE ENOUGH COOLANT IN COOLING SYSTEM. ALSO MAKE SURE COOLING FANS ARE WORKING.IF CAR SITTING AND IDLING IN A LONG TRAFFIC JAM ON FREEWAY OR ELSE WHERE.IF COOLANT FANS DONT COME ON CAR WILL OVERHEAT BOIL OVER.HAVE CAR SCAN FOR A FAULTY COOLANT TEMPERATURE SENSOR FAULT.AND CHECK THE COOLING FANS FUSE AND RELAYS.MAKE SURE COOLING FANS ARE WORKING.ALSO PUT COOLANT BACK IN TO MAKE UP WHAT BOILED OUT.

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3 Answers

1999 cadillac deville runs hot what are my options


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.
Also note that the cooling fans don't come on until the temp 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.

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2 Answers

The cooling fans wont kick in and its boiling


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.
If the purge line is blocked you may have an air lock preventing coolant flow.
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.

Air locks in the Northstar engine shouldn't be a problem as the system is self purging, providing all the hoses are clear.

Check the coolant level in the tank,it should be half way when cold.
There is no cap on the radiator as it is a fully pressurized system.

The expansion tank is the only means by which to add coolant to the Northstar engine.

Check to see if your fans are working by switching on the air con,they should run all the time.

With the air con off,the fans won't come on until the temp hits around 225 degrees.

Also, if it's boiling over, the cap on the expansion tank may not be holding pressure and therefore needs replacing.....a new cap only costs a few dollars so it is worth replacing to see if this solves your problem.

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Sorry but its common for this year to have a hyd cooling fan motor to go bad along with the coolant degas tank breaking...you'll need ford pn# XW4Z-8K621-AA motor and a # 388898S washer to replace, along with the degas tank..don't forget p/s fluid to refill the system...BESURE you totally PURGE the cooling or it will O/Heat in 2 blocks ....hope this helps you...GL

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2 Answers

How do you know if your engine is overheating? the coolant says 210 degrees wut do i do


When your engine is operating normally, the temp on the gauge should be between 190 and 225. The thermostat is set to open at 190 and this controls minimum engine temp. If you sit in traffic the temp will climb to 225 and then the cooling fan will begin to operate to make sure that you don't overheat.You know that water boils at 212 but you have to add 10 degrees for every pound of pressure the rad cap is set to. Also your coolant has antifreeze in it which raises the boiling point even more. A normal overheat condition of your engine would be 300 or more. Does this help?

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