Question about 2003 Chevrolet TrailBlazer

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Cooling system is overheating no exterior or interior leakage replaced thermostat this am purged air from system still overheating how remote is the idea of an impeller failure in the pump the mechanical fan clutch is tight and appears to rotatate at engine rpms

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  • Chevrolet Master
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If the coolant pulls down with the radiator cap off when increase engine RPMs the water pump is OK.These vehicles had been known for cylinder sleeve problems and head gasket problems.

Posted on May 31, 2010

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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

2 Answers

Overheating light comes on. I pour more antifreeze in and its good for a while. 207 Cooper s. Thermostat housing has been replaced.


Thermostat housing was replaced but the actual thermostat was replaced also?
If it was replaced you might have issues with the water pump, the impellers of the water pump are made of plastic and some of them might be broken.
Also when the thermostat housing was replaced was all the air purged from the cooling circuit?
Air still trapped inside cooling system can create overheating issues.
Never go over 50/50 coolant mix, a higher concentration of coolant can impede a proper engine cooling.

Dec 05, 2014 | 2007 Mini Cooper S

2 Answers

2001 f250 overheating


Check for cracks in the system. It sounds like you have too much air in it. If you are driving, does the temperature gage fluctuate? The cap is designed not to leak, but hot compressed air will blow by it. When it does, it easily confused as coolant "purging" out of the system, but really it is steam and air. By removing the thermostat, you are fully opening the coolant cycle and the water is free to circulate. Also, with the thermostat removed, the system can't build up enough pressure because it is open to the collector bottle, which in turn is open to the atmosphere. The system is designed to work under pressure so you should keep the thermostat in. That said, try to purge the system. Remove the thermostat, plug the overflow tubes, and pull a low vacuum on the reservoir (collector bottle). You want to make sure the reservoir is about half full. My personal experience is using about 5 to 6 inches of vacuum pressure for about 30 minutes. If there's lots of air, you will see bubbles in the reservoir. And as long as you have enough coolant in it, when you remove the vacuum, it will not draw air into the system, so make sure there's enough coolant in the reservoir. I am not sure about this truck, but some vehicles actually have a purge valve on the main coolant line close to the thermostat, and usually at the highest point in the system. It looks like a Schrader valve. So, if you have this, let the car cool down, put some rags around the purge valve, remove the valve cap and purge away (like letting air out of a tire). You'll have to do this a few time after driving to completely vent the system. Finally, if you do overheat again and start spewing coolant, before the car has a chance to cool down, fill the reservoir with coolant at least up to the hot level mark. That way, when the engine (and coolant) cools down, it will draw the fluid into the radiator. Otherwise, you just end up pulling more air into the system making the problem worse. Hope this helps.

Feb 12, 2014 | Ford F-250 Cars & Trucks

1 Answer

Well i replaced the thermostat and housing radiator cap bypass the heating controller unit and the car keeps overheating whats the problem?


Well first when you added the antifreeze did you run the motor and put the heater on high....This allows the heater core to also fill and purge any air that might be in the systemm...Also there is a air bleed located on thermostat housing ...You need to loosen it while the engine is running and then tightening it back up once all air is purged from system...Once this is accomplished ,after you have driven your vehicle and has reached operating temperature ,park it and let it cool....After it has completely cooled remove radiator cap and add coolant if necessary...If car still is overheating you might have a head gasket that is leaking....Good Luck!!!

Jul 02, 2010 | 1999 BMW 318 ti

4 Answers

My 1997 cadillac eldorado overheats plugs, thermostat, water pump, intake value have been replaced and still over heats.


Make sure the air in the cooling system is bled out,and make sure the cooling fans are coming on,and going off on there own.If they come on,they have to go off too,when it cools down.If the cooling fans do not come on,bled the cooling system,and replace the coolant sensor,this tells the computer to activate the cooling fan relays.Also check the fuse,and the cooling fan relay.

Apr 14, 2010 | 1997 Cadillac Eldorado

2 Answers

I just changed the thermostat in my car and now at times it gets hot and i have no heat


It is very possible that you have put the thermostat in up-side-down or you may have just been one of the lucky people that got a bad thermostat and get the experience of putting it in right twice.

Dec 12, 2009 | 1997 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

II have a 98 deville changed thermostat 3 months ago,started overheating yesterday after i checked my coolant level


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.

Oct 06, 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.

Aug 25, 2009 | 1999 Oldsmobile Aurora

2 Answers

Why is it overheating?


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

Jul 08, 2009 | 2003 Lincoln LS

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