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seal tabs
The seal tabs I am referring to come from GM, they are less than 10 dollars. GM recommends putting them in any time the cooling system is serviced, they in fact, put them in at the factory. There is a sticker under the hood about it, as well as TSB's about it. They DO NOT go in the resivoir. You need to remove the bottom radiator hose and put them in through there if you want to do it right. I dont think they will stop a big leak. Mine was dripping a spot about the size of a dime every 2 or 3 days...
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