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What could make a radiator leak one day then not the next time I start up the car three months later? Three months ago just be before we left on a trip I noticed about half cup of Antifreeze under the radiator and could see wet area on fins starting near the top and dripping off the bottom. I just went out yesterday in 30 degree F temps to look for leak after I got car up to 170 degrees. No leak. Is it just my lucky day or what, lol? Thanks Marty