Question about Pontiac Grand Prix

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My Grand Prix stared running hot. We replaced head gaskets and intake gaskets, replaced water pump, thermostat, and flushed radiator. My car is still running hot. The heat not blowing hot even after new thermostat. it will idle cool. But if you press gas or drive it instantly stars running hot

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Are you sure that the radiator is not clog ,also check the cap for broken gasket also check the hoses for stiffness i would also wanna run it without thermostat to see what happens ,some times they come defected from manufacturer good luck

Posted on Mar 30, 2011

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  • rlrippy1980 Mar 30, 2011

    Thanks. Just put radiator back in. It seemed to be fine. The hoses seemed to collapse before we changed water pump. they no longer do that since it was replaced. and even though the thermostat has been replaced, the heater still does not work. Will check that next. hopefully it is what the problem is. Have replaced just about all we could think of. Thank you for your help.

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2005 Pontiac grand am overheating replaced intake gasket checked hoses replaced thermostat what else could it be


Could be a blocked heater core. Could be a head gasket or a warped head or block if it got to hot at one time.

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I Have a 1997 Pontiac Grand Prix, For months now my temperature gauge has been running hot to nearly 260 degrees. The car has never officially overheated although the fans do kick in, In the last few...


What's chances that the temperature gauge or sender itself is wrong?
Is the heat exceptionally hot? What temperature is the heater dicharge when the gauge reads 260?
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If you need further help, reach me via phone at https://www.6ya.com/expert/scott_541ceb86d69e7743

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There could be several reasons that may cause an engine to overheat. It sounds like you have covered the most important ones. Thermostat,radiator and water pump. Hopefully you do not have internal damage, cracked head, head gasket, or a cracked block. I would try flushing the heater core and pay close attention to what comes out. You know, is it clogged with stop leak or rust. Then while I was flushing that I would drain the entire system and put in some Prestone super radiator flush. You just add plain water with it and run your vehicle for about 10 minutes. You then empty your cooliant system and refill with antifreeze. The flush works pretty well and if there is an obstruction from a previous owner putting stop leak in the system it generally will clean it out.
BTW, are you sure the thermostat is in properly? Not upside down? I think I would start there before I went through all of the work of flushing the system. It actually sounds like from everything you've done already, that's possible. Hey it does happen once in awhile. Was this car overheating when you bought it? If so, maybe the previous owner put it in upside down, and when you changed it put it in the same way by accident.
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