Question about 2001 Pontiac Grand Am SE

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Same Problem:Runs hot comes out over flow no leaks

2001 Grand Am runs hot anti-freeze comes out of over flow there are no leaks.Could it be the sensor and where is it located.I'm a female and would like to fix problem myself.Thanks

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What you need to do on this 8 year old vehicle is simply service the cooling system and see where you stand after that. Turn on the A/C and see if the fan runs. It will run continuously with the A/C on. This will tell you if the fan is good or not. When the engine overheats is the fan running. If so, you know the thermal sensor is good. If not it needs replacing. Do you see coolant flowing in the radiator with the cap off engine cool. You will see the flow when the thermostat opens. Purchase a new thermostat, 1 gallon of DexCool antifreeze, & 1 gallon of distilled water. Set the heater control to full hot. Clean the exterior front cooling fins of the radiator of all debris. Drain the radiator and remove and replace the thermostat, being careful to install it correctly. Install exactly like the old one. Now flush the system with plenty of water. Drain and clean the overflow reservoir. Shut the drain valve and pour in a 50/50 mix of DexCool and distilled water until the radiator is full. Keep adding coolant slowly until all air escapes and you can add no more. Start the engine with the radiator cap off and add coolant as the level goes down. Run the engine until you see no more air bubbles escaping. Put the cap on and bleed air from the system with the bleeder valves if equipped. If no bleeder valves, all the air should have escaped, but I recommend you drive the car and repeat the bleeding process one more time. Careful only remove the cap when the engine is cold. If this does not solve your problem you may have a defective water pump.

Posted on Sep 05, 2009

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If the anti-freeze is coming out of the overflow you probably have serious problems. One it could be a blown head gasket or blown intake manifold gasket. I not sure what your abilities are as far as mechanical but there is a lot you have to do and have the tools to do it with. That would explain why you are running hot if you had either of these two problems.

Posted on Sep 05, 2009

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  • outdoorsman5
    outdoorsman5 Sep 05, 2009

    I am sorry, It could be as simple as a bad thermostat which is not real serious.

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Walk through on how to replace a thermostat in a 2001 Jeep grand Cherokee


Jennipherbrr,

1. Make sure the car is cold. Remove the radiator cap (press & turn about 1/4 turn to remove pressure in the system) Once the pressure is bled off you can remove cap and leave it rest on the filler opening.

2. Find the petcock on the radiator (the little valve attached to the radiator. You have to open/turn clockwise to drain the anti-freeze. Drain anti freeze below thermostat housing. About 1/2 to 1 gallon.

3. Have a catch basin for the anti freeze under the car. Remove upper radiator hose from radiator and thermostat housing.

4. Remove thermostat housing from engine block (usually two or three bolts in the thermostat housing). Scrap off ALL old gasket material from engine block. Double check and make sure all gasket material is removed from surface. If not the thermostat housing will leak.

5. Install new gasket with some high temp silicone. Place a couple of dabs on the thermostat housing and gasket (the silicone is used to keep the gasket in place) *MAKE SURE YOU INSTALL the thermostat the same way you took it out. Don't over tighten the thermostat housing bolts.

6. Remove the radiator cap and replace the anti freeze you removed (make sure the anti freeze is clean). Fill the radiator to the top of the filler neck and replace the radiator cap (push and turn the radiator cap to the right- like a pill bottle). Start the car and make sure the temperture guage goes up. The guage pointer should be in the middle of the guage.

7. Check the radiator reservoir for proper anti freeze level. DO NOT OPEN THE RADIATOR CAP WHEN THE CAR IS HOT!!! THE ANTI FREEZE IS HOT AND WILL BURN YOU.

Hope this helps

Apr 19, 2010 | 2001 Jeep Grand Cherokee

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better check your engine oil ASAP.
If the oil on the dipstick is bubbley and discolored the anti-freeze is leaking into the motor.

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1 Answer

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Main common causes of overheat are lack of flow: bad thermostat, (after an overheat, thermostats become unreliable replace it as "routine" they are inexpensive.) internally or externally obstructed radiator (internal, flush or replace, external, clean leaves bugs etc from outside front of radiator.) A radiator that takes a long time to fill generally is internally blocked. Bad cooling fan, fan sensor or relay. (make sure electric fan comes on when engine reaches or is just above normal temp...If not, hot wire fan motor to battery....replace if it does not run. find and check
relay if there is no power and ground at the fan plug harness when fan
should be on...relay may be in power distribution center or below right front headlight, best accessed from below. If no ground signal at relay from the computer, check the temp sender. (sender sends info to computer which sends ground to relay that sends power to fan motor)
If water pump is not leaking or noisy, leave it alone...they will pump even when the seal and bearing are horribly bad...there is no "secret stuff" in there.
It also won't hurt to check the clutch fan if you have one....it should spin free when cold and offer some resistance when hot. Pretty rare they fail but they can.
Any questions just ask
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