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Old 13 Jan 2018, 11:02 am
06_PB6_TOURING 06_PB6_TOURING is offline
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Join Date: Dec 2017
Posts: 240
Default Re: 2003 touring,coolant leak under timing cover

As stated, stop leak won't fix a water pump shaft seal. The _only_ stop leak to use on weepy leaks is Bars Leaks tablets, they are also branded under AC Delco ( GM ) and probably most other auto makers .

This is a tablet you crush, add to the cooling system then drive the car. The sealer won't clog a rad or heater core that already isn't a 1/2 step away from being clogged. It is mostly Ginger and some fine (saw? ) dust. It is stealth and doesn't make the coolant look like mud. In the 80's GM specifically recommended using this on "all " HT 4100 Caddy aluminum V8s to seal weepy leaks.

Now for something I only recommend on a car that is on it's last legs, when the gas in tank is worth more than the car, or emergency conditions not a permanent / sell the car fix.

There is a head gasket sealer called " Blue Devil" , at $ 60 a qt is is $$$ but it _will_ take a combustion chamber to coolant head gasket leak to near nothing. It contains "Silicon Silicate " AKA " Water Glass ", when mixed with water these fine strands are in suspension. When this mixture hits a leak the water is strained out and the glass fiber bond together ( heat helps also ) plugging the leak.

I used this on a 4.3 GM V6 that was starting to eat coolant. At that point in time, things were too busy to take it down. The sealer dramatically slowed coolant usage until I could take it apart. The head gasket was fine, the head had developed a slight low spot and this loss of clamping pressure allowed coolant to weep into the combustion chamber.
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