2002 Pontiac Grand Prix is overheating I have flushed the system and changed the t-stat, once it starts to overheat I can turn on the heater and it will cool down which tells me the t-stat is opening and coolant is flowing properly.... I think. Any suggestions before I tear into the head gaskets?

Asked by Sep 06, 2013 at 05:35 PM about the 2002 Pontiac Grand Prix SE

Question type: Maintenance & Repair

3 Answers

475

Before you start throwing money at the problem , get the cooling system pressure tested, have it done twice, when the engine is cold & then again hot, do a compression test on all cylinders as well, (same approach..cold & then hot)..note the readings, if you have a blown head gasket the cylinder which is bad should be revealed. Consider pulling the rad & send it into a shop to be flow tested & flushed. Seeing as the *heater* core is capable of lowering the engine temp that tells me the rad is not doing it's job properly.

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79,265

Also check the radiator cooling fans. Do they come on? HTH. -Jim

1,505

Make SURE your radiator is not plugged with dirt ! It s a simple check and you can save a lot of grief by taking it out and washing it out with a hose

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