alright i just finally put in a new aluminum radiator, jb weld did work by the way, but i finally scraped up enough $$ to get a new one. anyways my question is, there's 2 fans behind the radiator.. one is a little bigger than the other one. is one of them supposed to always be on? or do they both just come on when it gets too hot???? thanks, just want to make sure they're working right