Question about 2002 Pontiac Grand Prix

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Changed thermostate still overheating

94 GrandAM, CHANGED THERMASTAT STILL OVERHEATING , DONE BLED AIR OUT OF SYSTEM, AN STILL OVERHEATING

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What about the water pump? is the water circulating
is the electric fan working? check all these things outlook in the radiator see if the water is circulating feel the top hose is it cold or hot when the engine is runing

Posted on Jan 01, 2009

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Posted on Jan 02, 2017

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HI, Vehicle had no heat and was overheating, so we had the heater core flushed - twice. Didn't help. We changed the heater core and thermostat. Now vehicle is still overheating. What else do we check?


You first make sure that the cooling system is completely bled/purged of any trapped air, that can cause both symptoms, it that is done and you are sure you have purged all the air out then the head gasket would be most likely leaking.

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Could be air lock in system that needs bleeding or water pump not pumping water round!

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1 Answer

Overheating and not throwing any heat


Have a flow test done on the radiator to check for blocked cores. Have a compression test done to check for head gasket and cracked head. Check that there is not an air lock in the cooling system as an air lock will cause overheating and no heater temperature.

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1 Answer

1997 a4 se overheating.i have changed the thermostat and car is still overheating.cold air is coming from the blower.car drives perfectly otherwise.fan is not coming on.how would i diagnose the problem


Alot of time you have to bleed the cooling system after changing a thermostat it gets an air pocket in it look for a bleeder valve near or on the thermastat housing if so bleed it to get the air out.check the radiator and make sure its full because if you filled it up after changing the thermastat once the thermastat opened after the engine ran awhile well the cooling system needs refilled.

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1 Answer

Radiator is overheating chaned thermastat still


water pump is the problem,you will find the the water pump impellor has broken or come loose from the shaft,you going to have to replace the water pump

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1 Answer

Overheating, already changed thermastat and bled air outof system


flush radiator, check hoses to see if collapsed or pinched

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1 Answer

Overheating


Yes, you re correct! thats a thermostat issue.

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