Question about 1996 Pontiac Grand Prix

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1996 Pontiac Grand prix Coolant problem.

My son kept getting the coolant light on along with the check engine light. He bought some coolant/antifreeze and poured it in. It turned thick and goooey, and yellow. Then it overheated when the weather got cold. Who can tell me what happened and how to fix this mess ? I don't even know what kind he bought. The bottle was Prestone.

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  • Daniel Arellano
    Daniel Arellano Dec 18, 2008

    THANK YOU RCL, I FIGURED SOMETHING LIKE THIS COULD BE THE PROBLEM. BUT HAD TO MAKE SURE.

  • christiana12 Jan 16, 2009

    I am having problems with my Grand Prix the low coolant light came on and we put the peeks anti-freeze into it immediatley the next day the thermostat was jumping from 150-290 spontaniously and the heater stopped working.


  • Daniel Arellano
    Daniel Arellano Feb 01, 2009

    I changed the thermostat. And Changed the temperature control sensor. Because the fans were not coming on. That fixed the problem. But the overheating damaged the intake gaskets. Had to replace all the intake gaskets. Reflush the engine and fill with fresh coolant. it seems to be working fine now. Thanks for your help.

  • kenworth1009 Feb 20, 2009

    96 grand prix 3.1 ltr temp gauge fluctuates from about 150- 260 even way over the high point for the gauge then it will drop back down then it will be fine for a while along with the heat loss did put in a new radiator with the correct coolant

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  • 31 Answers

The car came with GM dexcool in it and was mixed with a noncompatable antifreeze. You need to flush to entire cooling system including the heater core. Any Certified shop can handle this job and recycle the used fluid. As for the Ck engine light only a scan can tell you if it is related or not.

Posted on Dec 18, 2008

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2 Answers

How are you supposed to add antifreeze to a 1997 Pontiac Grand Prix


the plastic jug is an overflow container when the vehicle gets warm excess coolant from the radiator flows to it there is a sensor somewhere on the jug or in it for coolant level if it doesnt hold coolant it is most likely cracked as it is only plastic and should be replaced

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Where is the thermostat located on a 1996 pontiac grand prix, engine is a 3.1


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Feb 14, 2011 | 1996 Pontiac Grand Prix

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My car is leaking antifreeze onto the ground under the reserve tank. It is not overheating and of course after the coolant has leaked out my low coolant light comes on. I added more but there was still...


If your coolant light turn on sometimes, and you can check that your coolant level is low, definitly you have a leak.

I suggest check this artricle about how to detecting coolant leak

Hope this help (remember rated and comment this).

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if the coolant levei is ok
then replace the low coolant sensor on the side of the rad

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