Question about 1999 Pontiac Grand Am GT

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99 Grand Am was leaking coolant from the over flow?

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  • eriklarsevan
    eriklarsevan Mar 24, 2012

    If the overflow bottle is boiling over, don't bother replacing just the cap. Replace the entire bottle and cap at the same time. The bottles are part of the cooling system and fill with scalding hot coolant. Over time, they warp and won't hold pressure. The system get's full of air and when you stop the engine, she'll blow all that air into the overflow bottle and your anti-freeze goes all over the ground with it.

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This is a common problem with older GM cars with the resevoir being part of the pressurized cooling system. The problem is actually the resevoir itself. Over time, the bottle warps and won't make a good seal with the bottle cap. After a drive, the system has actually sucked in air and becomes over pressurized. Eventually, it reaches a point where all those bubbles start making their way back to the resevoir bottle and you're coolant goes out on to the ground with them. Replace the bottle. A new cap comes with it. Assuming you don't have a bad head gasket, you're boiling over problem will disappear like yesterdays bad news.

Posted on Mar 24, 2012

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If you have a six cyl poss intake leak low on fluid & then blown head gasket--if 2.4 quad blown head gasket & cracked head--2.2 blown head gasket wish you lots of luck!!!!!!!!!!!!!!

Posted on Sep 09, 2009

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You need a new radiator cap. The cap pressure should be 16#
(16 pounds)....

Any other symptoms? Car overheat? White smoke out the tailpipe?

Any more info would help solve this...

Posted on Sep 09, 2009

  • eriklarsevan
    eriklarsevan Mar 24, 2012

    You need more than the radiator cap, you need to replace the coolant resevoir bottle too. The cap isn't actually the problem. The bottle itself has warped from years of hot antifreeze and is no longer making a good seal with the cap. The system will continue to become air bound until you replace it.

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Could be that it was hot or could be that you have a blown head gasket. If the engine got hot once it could have been enough to blow the head gasket. Does it blow it out after it warms up every time?

Posted on Sep 09, 2009

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