2003 Head Gasket Repair
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Northstar Engines and System Technical Discussion Discussion, 2003 Head Gasket Repair in Cadillac Engine Technical Discussion; I have a slow coolant leak that I'm still trying to find but I think it may be the crossover ...
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    2003 Head Gasket Repair

    I have a slow coolant leak that I'm still trying to find but I think it may be the crossover manifold gasket.I have no puddles under the car and really can't find coolant dripping.I do see dried dexcool specs everywhere and it looks like there is a lot of dried dexcool on the bottom crossover gasket closest to the water pump but its hard to see in there.I need to pressure test first to see for sure.I know the 2000+ engines are know for leaking at the crossover gaskets.my main question for now is it even worth trying to use the bars leak or is that just a temporary fix if it even stops the leak?

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    Re: 2003 sts coolant leak (possible crossover leak)?

    Please don't add the stop leak additives to your coolant system.

    They can possibly end up in the wrong places creating a blockage. EX. heater core, purge line, radiator.......

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    Re: 2003 sts coolant leak (possible crossover leak)?

    As much as I don't like that stuff, Bars might work in this situation. I would only even consider it because of the difficulty of replacing crossover gaskets, but if you do, DO NOT go crazy. More is not better. 3-4 tabs at the most.

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    I actually have some of the bars leak powder form, but I'm really debating if I should use it or just break down and fix it right.is it mostly time ,is fixing the gaskets mostly time consuming or is it just a pita in general?

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    Re: 2003 sts coolant leak (possible crossover leak)?

    Replacing the crossover gaskets in our engines is a minimum 8-hour DIY job with a strong back and an advanced set of shop tools.

    Cadillac shop labor alone is 4.3 hours and that's with any special tools needed.

    It can be done in a heated garage, but it's no fun at all.

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    sts 03's Avatar
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    What sort of special tools does one need?I read somewhere about having a flex head ratcheting 10mm and 13 mm wrench , and some swivels extensions .

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    Yeah, the 13MM being the most important.

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    Nothing else special besides that?

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    Re: 2003 sts coolant leak (possible crossover leak)?

    Patience.

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    And lots of cursewords, lots

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    Yeah I've been reading about the pain it is.maybe I'll try a little bars leak , if I was to use the powder form how much?

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    Re: 2003 sts coolant leak (possible crossover leak)?

    Follow the instructions. One tube I think and DO NOT put it in the surge tank. It has to go in one of the radiator hoses. The upper is the least messy unless you are draining the system.

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    It says to use the whole tube,I think its 25 grams.

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    The reason the crossover gaskets leak is that the plastic forms that hold the shape of the seals, and fills the small gap between the crossover and block/heads, begins to crack. Once it fails, coolant pressure will have no problem pushing the seals out of the way. Leak stop has no chance of stopping that, and it will leave you on the side of the road.

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    On the 2003 is the throttle body part of the crossover or does it separate from it?

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