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Power Strokes
7.3 Tech
Overheating issue
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[QUOTE="TARM, post: 1067572, member: 578"] My guess is your fan clutch is going out. It sounds like its the viscous clutch is not staying engaged like it should be. Regardless if you are overtaxing your engine or not with that load the fan clutch should not be disengaging if the air temp is over 205F so unless that fan is roaring and you are still overheating then I say the fan clutch. It works independent of all other systems strictly on temp for lockup. It should be fully locked up as air temps coming across it thru the radiator reach 205 F at which point it should be at full song and roaring like a freight train considering it along is using something around 27 HP!! That is moving some serious air. The other possibility if you have not already replaced it is the T-stat. If its not fully opening it could be possible to have rad temps much lower while engine temps soar. Obviously a tstat is super easy and cheap so I would change that just to be on the safe side. But you could always do a rough test of yours in a pot of water to see when it opens. It should at least start to open within 4 degree of its rating usually 195 so say by 200 and should be fully open by 220. If that checks out than I would strongly suspect the clutch. Which sucks as they are not cheap. Maybe look at a salvage yard Here are the instructions for testing the fan clutch, both minimum and maximum speed tests: [/QUOTE]
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