Question about 1999 Chevrolet Lumina

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Best way to replace thermostat on a 1999 chevy lumina 3.1. do I need a 13m flex rachet because I can't get a socket on the bottom bolt.

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  • Dave Sep 23, 2009

    So if I take the exhaust crossover pipe out will I need to buy gaskets? also if choose to go the other route are you saying 13 flex 1/4inch drive?

  • Dave Sep 23, 2009

    thanks tedpineywood, I'm leaning towards removing the cross over.

    It seems it would be alot easier for cleaning the thermostat gasket and repacement and I could use a socket to loosen the bottom bolt.



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The bottom bolt only needs to be loosened not taken out. they are tough, but you can do it.

Posted on Sep 23, 2009

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HI" the best to get to it with out a struggle is to remove the cross over pipe make sure engine is nice and cold apply plenty of wd -40 to 4 bolts holding cross over pipe in place ,this will save you lots of frustration ,you can go the other route 13 flex pref 1/4 and plenty of patience when put in it back together ,hope this helps

Posted on Sep 23, 2009

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