I replaced my radiator with one I got from u-
pull it and refilled the radiator with it running
but now it is running hot what did I do wrong
Maybe nothing, the radiator you got could be restricted, if you have one of those no contact heat guns you can do a thermal scan of the radiator.
let me count the ways- long story short, try bleeding the cooling system, there might be air in there- or MAYBE your overheating problem wasn't the radiator after all? sorry, gotta go now-
Any time I've bought a used radiator I take it to a radiator shop to pressure test it and check for good flow. It's not worth going through all that hassle for a bum radiator. But then again radiators are so cheap new, it's not really worth taking a chance on an old one.
I would say air lock
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