Its a 99 cherokee 4.0, overheating previous owner says it just needs the new radiator put in, there was no antifreaze in the oil, the radiator isnt leaking any fluid. Looks like the fan motor under the dash might be blown cause there was smoke coming out under the dash of the passenger side. Dont think its the head. someone thinks i should hook up an electric fan with a toggle switch how can i fix this?