it could possibly have either a blown head gasket or intake manifold gaskets leaking
water pump. thermostat.
a new heater core
On the 3.1 LS model, the thermostat is in the intake manifold, just underneath the air intake, and between the exhaust crossover and the manifold. Trace the upper radiator hose back to a metal pipe from the engine, that is the thermostat housing. Replacing it means using a ratcheting box-end (10mm?) or open end wrench to start and finish, and fingertips for the rest, so NOT when the engine is hot! The thermostat fits horizontally into the manifold, and comes with its own molded gasket, which fits into a recess, and doesn't require gasket sealant. I just changed mine, so good luck.
check your intake manifold gasket.
have you changed the battery in the thermostat?
If it is leaking coolant. And you changed the thermostat. I would then move to this section. Flush the radiator and the heater core. This can be done at a certified shop with a reliable mechanic.
the thermostat is located behind the glove box retained by two Phillips type screws err no that's the resistor pack for the blower motor,the thermostat is located below the inlet manifold with a plastic top attached to a steel pipe running the length of the block and down to the rad,three t8 bolls hold it on and with patience can be changed without manifold removal ,the steel pipe does however need undoing
You may have the thermostat in backwards. The spring side of the thermostat faces into the engine.
that's what it is, i have a lumina, had same problem, replaced the intake manifold. run like a top since
Sounds like thermostat is not opening and needs replacing
Check the Blender door... Also check the temp knobs they make be broken.
It could be you thermostat Have you have already checked oil level, and/ot changed oil recently Exaust restrictions can cause overheating
How did you change the thermostat?
i changed mine but what a nightmare. I don't think they could have fit the thermostat in any tighter back mounting bolt has to be turned with a open end wrench about 1 flat at a time to get it out. I had to take off the radiator hose and the duct from the air intake to the manifold to get access. It takes longer to get access to the thermostat than it does to get it off. firstname.lastname@example.org
The thermostat is located on the back side of the engine if you are facing the car. As you face the car, it will be to the passenger side, down under the exhaust manifold. To get to the thermostat, you will have to remove several different bolts. Remove the heat shield on top of the exhaust manifold, three bolts there. Under the engine, you wil see a metal pipe that leads up to the thermostat housing that will have a blt with a wiring clp attached to it, remove that. Then there are the two bolts that hold that pipe up that you wil need to remove then. If you need more info, let me know, I just changed mine.
I had to pay a dealership $450 to change the thermostat on the 3.4L engine. You have to remove the crossover exhaust manifold. Once that is out of the way, the thermostat itself is easy. Before the manifold is removed, I could only touch one of the two bolts holding the thermostat housing in place, much less get a wrench on it. Good Luck! after i read this i had to say something. I've changed thermostat on a 2002 Buick rendezvous before, it wasn't hard and you don't have to remove the exhaust crossover pipe.I could not reach the back two bolts on the cross over manifold, so I took off the last piece of the air intake where the throttle position sensor is located. At that point I could get a wrench down there a slowly loosen the lower bolt enough to slide out the thermostat housing, and eventually the thermostat. It took me a couple of hours to complete a task that on any other car would take 30 minutes or so.
thermostat on 3.1 engine is located on driver side right behind manifold crossover. remove air breather. u need 1/2 inch socket for left bolt, right hand bolt is very hard to get to. i just changed thermostat for daughters 98 Malibu with 3.1. good luck pressley
The thermostat is not opening up enough,
You have to install the thermostat with the jiggle valve in the 12 o'clock position.
I had this problem on a 2001 Ford Fiesta. I ended up having to get the temparature gauge sender unit replaced.
The exhaust manifold on a Chevy S10 truck is changed by removing the spark plugs, unbolting the manifold from the cylinder heads, and unbolting the collector. The manifold can then be removed from the vehicle and a new set put in its place.
The thermostat is inside of the water inlet on top of the motor. Disconnect the top water hose, then unbolt the water inlet. The thermostat can then be changed.
You could have a bad water pump causing no coolant flow, inoperable radiator fans, a coolant leak,............