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Go to the radiator stop leak section at an auto parts store. OR go to GM dealer. They have some Brown tablets on a skinpack card display that are about 1" diameter that they put into the cooling system that disolve and are intended to plug permanently any minor leaks. The techs often use them when an intake is R&R'd to eliminate leaks and customer come backs. They will not harm the balance of the cooling system. AND they work.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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