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it all depends on how big the hole is. but i would not suggest ever using a "leak stopper" unless it is an absoulue emergency, they always cause problems down the road which can get very expensive. I agree with that fella above...If you MUST use something use a table spoon of black pepper. This stuff is a miracle worker and its not AS detrimental to the other components of the cooling system. My grandaddy showed me this "indian trick" on an old Dodge car with a crack in the water pump....It ran fine for several years answer i agree with not using stop leak it makes the problem worse down the road the black pepper solution i have used many times in engines fro 4 cylanders all the way up to 450 horsepower truck engines most laugh but it is fool proof and will come out of engine when u dump radiator other than that, replace heater core they are not expensive

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Q: Is it possible to stop a leaking heater coil by putting a liquid stop leak in it?
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