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Overheating engine removed thermostat, same problem

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This is a common misconception with cooling systems.

Removing the thermostat will cause overheating, due to the coolant not having time to be cooled down in the radiator. That is why if it is left idling, it won't overheat (low RPM - slow coolant flow).

The thermostat acts as a type of "restrictor" and slows down the coolant flow, giving the radiator time to do it's job.

Posted on Jun 22, 2008

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What happen when I remove out the thermostat?


the thermostat opens and closes to allow the coolant to flow in when it's supposed to and out to cool the engine and keep the engine temperature steady. The part is there for a reason and purpose. I would replace it before you have an issue.

Mar 03, 2015 | Cars & Trucks

1 Answer

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

Will removing my thermostat help keep my car from overheating until I can get it into the shop?


removing the thermostat is a sure recipe for overheating as it allows the coolant to circulate too quickly to allow the heat top transfer to the air
have a compression test done to check for head gasket
The power steering pump failure would not cause a water pump seal to fail so I suspect that you were "had" there
check that the coolant level is at the radiator cap . You may have to bleed any air out of the cooling system as that will cause overheating and no heater hot air.

Jan 03, 2015 | 1997 Lincoln Continental

1 Answer

Engine overheated , got second hand engine but still overheating after new Radiator and thermostat. What could be the problem


-Remove the thermostat and flush the engine back and forward couple time with water. Then re install the thermostat back to. Make sure the thermostat's spring or bottom go inside the engine.
-Make sure the water pump is in good shape, belt drive the water pump must be good tight.
-Try this you should be good to go.

Good luck

Mai Lor

Nov 04, 2014 | Cars & Trucks

7 Answers

Is is safe to take off thermostat on a 1996 jeep grand cherokee limited?


Thermostats are used to keep the engine operating in the optimum temperature range. Generally speaking, it is safe to remove the thermostat in summer conditions. Coolant will flow continuously with no restriction. In winter months and below freezing conditions the engine may not reach proper operating temperature. Removing the thermostat may help you find the possible over-heating problem.

Jul 29, 2014 | 1996 Jeep Grand Cherokee

1 Answer

Replace thermostat its overheating


If you overheated your Contour, you have also probably blew the head gasket AND warped the head but hopefully Not.

The Thermostat is removed by removing the 3 bolts on the housing. Install the Pill DOWN.

Recommend that you replace it with a "FAILSAFE" thermostat and I do hope you did not do any damage to the engine

Apr 15, 2013 | 1998 Ford Contour

1 Answer

2006 CHEVY COBALT OVERHEATING HAS NEW RADIATOR WATER PUMP AND THERMOSTAT


That is normal, it will not get hot without the thermostat. The water cools in the radiator and falls to the bottom and the bottom hose is cold. This is what cools the engine and stops it from overheating.

Oct 26, 2011 | Cars & Trucks

3 Answers

1997 Cirrus is still overheating... The heater does not blow out hot air...would the heater core cause the vehicle to overheat? if not, what other problems am I looking for, I was loosing anti freeze...


it appears that you have a large air pocket/low on coolant. The engine is getting hot due to the lack of coolant but there is no heat because nothing is flowing through the core.

Feb 20, 2011 | Chrysler Cirrus Cars & Trucks

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

1 Answer

Overheating


You can remove the thermostat, but this is not the best thing in the world for your engine. Your thermostat lets your engine reach operating temperature quickly for best oiling. Over cooling is almost as bad as over heating and since your thermostat is relatively cheap (http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_THERMOSTAT-PERFORMANCE-Mr--Gasket_17360031-P_N6003E_P%7CGRP2061A____) 9.99 at advance, you should just go ahead and change it out. Let me know if this helps :)

May 10, 2009 | 2003 Ford Ranger Regular Cab

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