Whoa!!! The fan worked when i tried it by hand and we checked the fuse, so thats cool, but there was something else that i found.. In the antifreeze/coolant tank there was this substance that looked like mud. There was brown sludge in there.. i replaced the radiator cap, cleaned out that sludge, poured new coolant, but its still over heating. my dad believes its the switch that went bad. Anything else i should look for?