Thread: 2007 grand Prix GT 3.8

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  1. #1 2007 grand Prix GT 3.8 
    SE Level Member cooper15's Avatar
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    My GP is going through a gallon of coolant a week. No visible leaks whatsoever. Just overheating obviously when it's out. Very very faint white smoke coming from exhaust I've noticed. Oil is NOT milky. Could this still be a head gasket leak?

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  2. #2 Re: 2007 grand Prix GT 3.8 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    It's possible, if it's been over heated one too many times it might be the case.


    Normally the intake gaskets go first, though 2007 should have the updated design but that doesn't mean they couldn't fail.


    A compression test might point you towards the issue if the head gasket is bad.

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  3. #3 Re: 2007 grand Prix GT 3.8 
    SE Level Member cooper15's Avatar
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    Would a compression test tell me a detailed idea of what's going on? Or just general. I just hate to go exploring and spendng money that's not necessary

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  4. #4 Re: 2007 grand Prix GT 3.8 
    I break things. WarStryker13's Avatar
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    Compression test can be done super easy, it's a matter of pulling a spark plug. Lol

    04 GP GT2: Handling upgrades, go-slow parts, and an attitude. Totaled.
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  5. #5 Re: 2007 grand Prix GT 3.8 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    If a cylinder is much lower on compression than the other it's likely to lead you to the cylinder burning the coolant. Like if you have 5 at 160 psi and then one at 120-130 psi.

    You can also pull the spark plugs and see what plug is super clean compared to the others or covered in white film because it's burning coolant.

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  6. #6 Re: 2007 grand Prix GT 3.8 
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    My 06 was the timing chain cover gasket just something to look out for
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  7. #7 Re: 2007 grand Prix GT 3.8 
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    My 07 is the timing cover gasket, too. And my buddy has an 06 or 07 and just did intake gaskets last year (he was going through oil, though)
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