Question about 2002 Pontiac Grand Prix

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Replaced thermostat and MAF sensor but temp still all over the place and car shakes in idol

My 2002 Grand Prix SE 3.1 temperature started to fluctuate a few days ago. Going up to 210 when idoling and going back down to normal when driving 45-60 mph. I had the thermostat replaced and added coolant. The service engine light code was for the MAF sensor. I replaced that today. But I now the car shakes when idoling and the temperature is still fluctuating but not as bad. Will this continue to happen until the computer resets itself?

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  • jbloom591 Apr 21, 2009

    Both fans are working and running.

  • Richard Scordino May 11, 2010

    Possibly...Also, is the electric fan coming on when vehicle is hot?

  • Anonymous Mar 19, 2014

    it does it while driving to it stalled today when i back up

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  • Pontiac Master
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Radiator may also be partially plugged. This usually becomes evident mostly in the spring, when ambient temps start to rise. When in motion, air flowing through unplugged radiator is sufficient to keep temp down, but at idle, fan can't pull enough air by itself. Since outside air isn't as cold, heat transfer is incomplete.
I'm sure someone out there will argue about my method, but I disconnect lower hose and block off the radiator lower connection, then do the same at the top. I use one container of CLR and pour directly into radiator (if you don't have a fill cap, use upper hose opening instead of blocking it) slowly pour in water 'till it's full. Leave for an hour then drain, use a garden hose to blow water through from top, out through bottom till it runs clear Seal off outside of hose to get pressure into radiator, wrap rag around it), then re-connect hoses, re-fill with coolant. (engine running heat full on).Generally this will give you most if not all flow restored.

Posted on Apr 21, 2009

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