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?
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.
Also check the radiator cooling fans. Do they come on? HTH. -Jim
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
Looking for a Used Grand Prix in your area?
CarGurus has 2,464 nationwide Grand Prix listings starting at $950.
Search Pontiac Grand Prix Questions
Pontiac Grand Prix Experts