I have a 91 350 SDL 175,000 mi that I have had for 2 yrs with few problems. The car seems to run hot now if the AC is off. I understand that that could be the fan clutch not engaging at 100c or the fan clutch switch. I have purchased a new switch but cannot find where it goes (do I want to have a mechanic do it or can a do-it-yourselfer handle it)...Am I on the right track? Please help...thanks