Question about 1995 GMC Jimmy

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Overheats once shut down with coolant presurring out, can not see leak any where and think it is the thermostat, where is the thermostat located?

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Its not hard to find the thermostat all you have to do is follow the top radiator hose to the intake, once there the hose will be connected to the thermostat housing. There should be two bolts holding the housing down on to the intake manifold, remove the two bolts and lift the thermostat housing away from the intake manifold and the thermostat will be seated on the manifold. Remove the old thermostat and clean out the area, place the new thermostat and you an use a little RV silicon gasket sealer or you can just place the thermostat in place the tighten up the thermostat housing. You may get a little leak at first but when the rubber o ring expands on the thermostat, the leak should stop so just idle the engine to it's operating temperature before your go out for a drive to ensure there is no leaks. Good luck and hope this helps. Keep me posted, be glad to answer any questions you may have. 

Posted on Jul 16, 2009

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Inside the engine

Posted on Jul 16, 2009

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1 Answer

2006 Equinox. Losing water. Over heats. Is this a thermostat or water pump problem??


Depends on where the coolant is going.
If it is an external leak it could be a leaking water pump. If there are no external leaks and you are loosing coolant, it could be a blown head gasket. Especially if the engine has already overheated once.
A sticking thermostat would cause the engine to overheat and then loose coolant from the overflow tank. But not until it overheats.

Oct 06, 2015 | Cars & Trucks

1 Answer

Thermostat location


Follow the upper radiator hose to the engine. The hose connects onto the thermostat housing. When coolant is drained, and upper radiator hose pulled off the housing, the housing can be removed by pulling off the two retaining bolts and lifting housing off. Then you will see the thermostat in the engine block. Lift it out to replace. Clean the mating surface of housing to block, use a new gasket for the housing to block, put it all back together. Do not over tighten the housing to block bolts or it may leak there. run the bolts down evenly until finger tight, then take a socket wrench and give the bolts a couple of turns. Not too tight-you can always turn them a little tighter if it starts to leak there after you have filled up the coolant, started the engine and checked for leaks.
Fill the radiator and the overflow reservoir. Leave the radiator cap off and start the engine. Let it idle until the thermostat opens -upper hose will get warm-coolant level should drop a little in the radiator when thermostat opens. Add coolant as necessary into the radiator. When the engine has reached normal operating temperature, put the radiator cap on and tighten it down. Shut off the engine and check once more for leaks. This procedure will ensure that no air gets trapped in the coolant system. Trapped air can lead to overheating.
Good luck.

Sep 25, 2013 | Chevrolet Corsica Cars & Trucks

2 Answers

1990 subaru legacy- overheats, I"ve


Most likely you put the thesmostat in upsid down. Good luck

Aug 17, 2011 | 1990 Subaru Legacy

2 Answers

My van started shooting water into the overflow. it was more like a blockage problem to me so here is what i have tried so far with no luck. i removed the thermostat to one make sure it was not stuck and...


Your right that there is not much to a cooling system when you only look at the cooling system without noticing the other components, not really something you do much on aircraft engines cooling systems.

A water pump can have a broken or coroded impeller making the coolant flow too slowly to carry the BTU's that needs to carried off. This usually would allow the user to operate the vehicle for the normal amount of time it would take to reach thermostat opening tempurature, so if it builds presure too quickly or overheats very quickly this may not be the problem. The normal amount of coolant flow through the system depends of the speed of the waterpump at that time, and the position of the thermostat. An egine turning 3000 and a thermostat wide open would produce a flow of about 2 - 3 quarts per 10 seconds. More for larger engines like, say, a v-10 viper.

Or there may be too many BTU's for the system to contend with, like for example, a leaking cylinder head gasket, cracked head/block or something like that which would allow very hot combustion gasses to enter the coolant stream adding huge BTU values to the system as well as increasng the coolant internal presures forcing the radiator cap to "pop" and relieve the system presure into the overflow bottle. In essence, a leaking headgasket acts like a cutting torch shooting hot combustion gasses into the coolant. The amount of time it takes for the system to overpresurize or over heat is a good indicator of coolant being exposed to combustion gasses. The cooling system can be checked for combustion gasses.

Or perhaps the heat being carried is not being effectively removed from the coolant. A radiator can become "sludged" up with stuff and litterally not be able to cool the coolant in the amount of time that the coolant is in the radiator. Sometimes a coolnt flush can help this, but it is only temporary. If the engine is normally producing, say, 250,000 BTU's per minute then the radiator must be able to carry at least twice that amount away durring heat exchanging.

Here's some clarifying questions we could use to help find the problem; (be specific and descriptive)


How long can you run the engine before it either overheats or starts overflowing the coolant?

Does the system presure increase very much when the engine is first started cold?

Is the radiator cap relieving the presure at the specified value?

Do the radiator fans work when needed? If the engine overheats rapidly when started I don't think the fans are an issue unless that is why the engine overheated in the first place taking out the headgaskets.

Also, if you wish to follow up on these questions let us know what model, year, and engine you have.

Always here to help, just ask away!

Apr 17, 2011 | Chrysler Voyager Cars & Trucks

2 Answers

2005 Dodge 1500 Truck overheats when idling


chances are that it isnt your thermostat, check to see if your coolant fan is turning on when engine reaches operating temperature. if it does turn on then i would suggest to check for dust/dirt in between your rad and a/c condensor. if it is dirty in between clean it out with a garden hose and you should be good to go

Oct 03, 2009 | 2005 Dodge Ram

2 Answers

Overheats when idiling and overheats , cools down , overheats when driving. Have replaced the thermostat but is still doing the same thing. There are no apparent waterleaks. No water in the oil and runs...


When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

===

Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

===

MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

===

Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

===

A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

===
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Sep 26, 2009 | 2002 Pontiac Grand Am

4 Answers

My car overheats and blows steam from reservoir


Check your radiator pressure cap see if theres too much pressure in it. If not that which I think it is, your thermostat may be stuck closed.

Aug 04, 2009 | 1990 Nissan Maxima

1 Answer

Changed entire cooling system and still overheats


The overheat sounds like an air pocket in the cooling system there are two bleeder screws located on top of thermostate hosing and 1 on the metal pipe just above the water pump I believe they are 7mm. with the radiator cap off and the car running slowly open 1 bleeder at a time just crack it loose until you get a steady stream of coolant make sure to keep the level in the radiator up. be carefull coolant may be hot! when you take the oil cap off you are creating a big vacuum leak thru the PCV (positive crankcase ventalation) system this is normal for this car to surge or die.

Aug 02, 2009 | 1997 Chevrolet Lumina

1 Answer

Overheating & won't start. Oil & coolant OK.


Sounds like your thermostat is stuck in the closed position. I'd replace the thermostat and flush & refill the coolant.

May 07, 2009 | 1995 Ford Explorer

2 Answers

I have a 2000 cadillac deville


You can rent a cooling system preasure tester at a parts store. These engines run so close to boiling that they must be able to hold presure or they overheat. Presurize the system and check for even the smallest leaks at all hose connections. I fought this problem for a long time before I figured it out.

Oct 14, 2008 | 1999 Cadillac DeVille

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