alright guys I have a 1990 f250 7.3 idi N/A with a 5speed manual. So I hauled up my 17ft fleetwood camper today for camping this weekend. The truck was trying to over heat doing 55 couldn't even touch 65. I had to pull and let her cool off. Then as I was driving you would hear the fan clutch right as I was about to shift but then never heard it again. It tried to over heat pulling a grade and I could only do 15mph and would still have to pull over. If I went any faster it would over heat. I've replaced the t stat with a motorcraft one and the top and bottom radiator hoses and the radiator.