Question about 1999 Pontiac Sunfire

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Just replaced my thermostat due to it locking shut on me but now my car will drive and stays cool but will now kind of sputter almost as if i was playing with the gas peddle but im not

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Is the check engine light on, and is it loosing coolant ?

Posted on Jul 31, 2013

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Posted on Jan 02, 2017

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SOURCE: just yestaurday i was driving and felt it a little

Check out this recall:

http://www.automotive.com/2004/49/pontiac/grand-prix/recalls/45415.html

Springs or the cable might be a problem. Check on the recall and then go from there.

Posted on Mar 28, 2010

  • 878 Answers

SOURCE: My Grand Prix stared running

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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1 Answer

I change thermostat, water pump, housing coolant sensor, but yet when i start driving the tempeture goes up and down and the heat gets kind of cool not all


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