Question about 1997 Pontiac Grand Prix

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My 97 gran prix overheated and shut itself. And now won't start. The Atifrz leaked out and engine overheated.

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  • frankluca566 Apr 09, 2011

    Thank you! I will go through the process that you explained. I will update this post. -Frank Lucas

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  • Pontiac Master
  • 4,977 Answers

Sometimes when an engine gets hot enough it will stop running due to the metal expansion when it is hot.if it cools off it will probably start but don`t run it very long especially without coolant.the thermostat may have seized in the closed position this sometimes happens as when the car is running the temperature flucuates the stat will close and open all the time(won`t close completely).another problem could be a bad head gasket that allowed coolant into the combustion chamber enough that the motor went into what is called hydraulic lock,coolant has filled the combustion chamber enough that the piston won`t move through out its normal travel.i would try changing the thermostat first refill cooling system and let run until the cooling fans have cycled on and off.if it doesn`t overheat and it cranks over when you try to start it then the stat is more than likely the problem.

Posted on Apr 08, 2011

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Posted on Jan 02, 2017

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If you haven't replaced the thermostat yet, try that next.

Please see my tip at http://www.fixya.com/cars/r5929960-s_thermostat . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

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since it sounds like this happens infrequently, you may want to check for something binding the accelerator pedal. ( wouldn't that be great if its that simple?) one can only hope...

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