I got a new 4 row radiator for my 69 Chevelle SS396. It hasn't ran in several years, and I was thinkin about firein it up with the old radiator, and flushing the system first. It barely leaks. Reckon it would hurt anything to run some vinegar and water mix through it for a few minutes, to help clean the calcium and crud out of the engine and heater core? Works good for cleanin coffee pots. Or is there somethin else that's better?