2003 Chevy Impala Overheating

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Thread: 2003 Chevy Impala Overheating

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    2003 Chevy Impala Overheating

    I have a 2003 Chevy Impala which seems to overheat sometimes. The gauge seems normal but sometimes I have no heat, but when I top up the coolant it seems fine. Also, I have check for any leaks and don't seem to find any. Does anyone have any ideas? Thanks in advance for any help.

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    Re: 2003 Chevy Impala Overheating

    Quote Originally Posted by lcovello View Post
    I have a 2003 Chevy Impala which seems to overheat sometimes. The gauge seems normal but sometimes I have no heat, but when I top up the coolant it seems fine. Also, I have check for any leaks and don't seem to find any. Does anyone have any ideas? Thanks in advance for any help.
    Sounds like the typical manifold gasket issue!

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    Re: 2003 Chevy Impala Overheating

    If you can pull some shrouding off to see if you have a pinhole leak somewhere, that could be part of your problem. It wouldn't 'splain the "no heat" though.

    And if you're frequently topping off the coolant, your sealed system isn't so sealed.

    My wife's PT was losing coolant but I could never find a puddle or see steam.

    Shop discovered tiny holes topside. PTs have lots of shrouding and other stuff that's in the way so I never saw the stains that indicated a leak.

    This is probably a good time to trade it for a 2012 3.6!

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    Re: 2003 Chevy Impala Overheating

    Thanks for the replies.

    By manifold issue, are you refering to the upper manifold or lower?

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    Re: 2003 Chevy Impala Overheating

    Quote Originally Posted by lcovello View Post
    Thanks for the replies.

    By manifold issue, are you refering to the upper manifold or lower?
    An upper manifold gasket leak could allow the coolant to be consumed rather than leaked out. result low coolant but no sign of leakage. This is a common problem with that engine.

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    Re: 2003 Chevy Impala Overheating

    If its a 3800 put lower intake gaskets and a new upper intake on it, if its super charged, just lower intake gaskets, if its a 3400 pry just lower intake gaskets but pressure check it and look at the head gaskets and water pump ect on all engines

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    Re: 2003 Chevy Impala Overheating

    Thank you to all for your help. The problem was actually the 90 degree elbow off the lower intake manifold to the serpentine belt tensioner housing was dripping. replaced that and all was good. Thanks again for all your help.

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    Re: 2003 Chevy Impala Overheating

    I changed that same elbow on my '02 Impala 3.4 a few years ago. It was also leaking. But my lost-coolant problem persisted. Then the "LOW COOLANT" message started appearing. Cleaning the sensor on the radiator cleared that up, but the lost-coolant problem persisted. Finally, I replaced the lower intake gaskets at about 105k miles. Today it has 161k miles on it and no more lost coolant.

    It's almost certainly going to need new lower intake gaskets. My factory originals came out fairly pristine, by the way. Replaced them with Felpros. Might've been just a torque issue. Only about 9 ft. lbs on them.

    If you're losing coolant through the engine that's not good for the lubrication of your engine.

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