| well, the summer time tells all on a radiator, if you have to refill the radiator every time or so, it may have a slight crack, or one of the hoses is leaking. to make sure, after you drive it and park it, sometimes you can even smell leaking antifreeze, or put a big peice of cardboard under where the radiator is, and come back later and look to see if its leaking. also they will be hotter in traffic, then highway, but if it has a temp guage, goes up to a certain point, and pops back down, the thermostat is doing its job. if it doesn't it isn't. | 
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