so i had a pinhole in my radiator where the fins and tank meet, squeeze the hose and it sprayed out. guy at auto value told me about this stuff called K Seal, its like 14 bucks for a little 5 oz. can but i shook it up, dumped it in the rad and by the time i got home(2 miles), i opened the hood and no more leak! drove 50miles tonight parked for 2 hours not a drop on the ground! check it out, works pretty shweet.