Question about 2000 Pontiac Grand Prix

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Had intake gasket replaced new water pump replaced manifold changed new plugs and wires . never had overheating problem in ten years now it is overheating they can't find problem say it is the gage itself the car is a 2000 gran prix

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In so far as it is a 10 year old automobile, and not knowing the maintenance history, my first area of concern would be the Radiator. The buildup of scale in the radiator core is a gradual process, and slowly reduces Radiator efficiency. What may seem like suddenly is, in fact, the result of long term process.
First step is to verify that the vehicle is actually overheating, or is the gauge just reading higher than normal?
Is the engine losing coolant? Then pressure test the system and Radiator cap, repair as necessary.
Are the cooling fans operating normally, both of them?
Has the radiator been checked for flow? Is airflow through the radiator restricted by dirt , bug debris, or plastic bags?
Finally, you may want to have the system block checked for the presence of exhaust gasses indicating Head Gasket leakage.

Posted on Dec 29, 2010

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Did they replace the thermostat? On these engines they put the temp sensor under the thermostat in the "lower" intake, the problem is that this wire runs very close to the exhaust that crosses over the trans, I have seen some melted right to the exhaust!

Make sure your wires are not melted to the pipe and the connector is clean, if you think it's the inside gauge check the temperature via a "non touch laser" job or bypass the factory sensor with a cheap aftermarket gauge.

These engines have a fault with the upper intake/ EGR melting the intake and leaking coolant into the engine. I recommended Dorman intakes.

I would replace the thermostat, drain and refill the system with 50/50 mix, check the wires to the sensor, and or replace the sensor, replace the radiator cap (most overlooked) and if thats not the problem have a code reader hooked up to your PCM that reads engine stats, this will show engine temp.

Hope this helps.

Posted on Dec 29, 2010

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