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Old 11-09-2008, 07:05 AM
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MagicRat MagicRat is offline
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Re: Hairline cracks in engine block...

Ideally, you would want to replace the leaking part, since that sounds like its a pretty bad leak. If its a small item, like a thermostat housing, then this may be the best way.
A cheaper, quicker solution may be this:
Head off to your local GM dealership or AC/Delco parts store and get some cooling system sealer tablets. They usually come in 6 per package.

Drain the coolant and put at least 4 of them in the lower radiator hose. Refill and run the engine for at least 1/2 hour and the leak should stop.

However, this solution should be considered to be temporary. If the cracks get worse, you may get another leak. However, often, these tablets can plug a leak for months or years. You just have to keep an eye on it, and carry a jug of anti-freeze with you.
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