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Reelclassic, The fan will be engaged at startup. Once air pressure has built up, it should disengage. If not, you are not getting air to the fan clutch. Start by checking for air supply in the line that runs to the top of the fan shroud. Do this after pressure has built up and with the engine...

This is normal. When the truck is cold and the air pressure has bled down, you should NOT be able to move the fan by hand. When the engine first starts, the fax will be engaged until the air pressure reaches a point when the fan will disengage and freewheel on the bearing in the fan clutch...

The Gov isn't selling these because they are in great shape. We should form a small African Republic, then they will send equipment and mechanics to keep it all going, eh? Pointman

As we are seeing triple digits here in Northwestern Nevada, I recently rebuilt my fan clutch and did a complete flush. The coolant coning out looked like pure Glycol. I filtered it using a paint strainer and reinstalled it. The three new belts were also replaced. Cannot stress enough to have a...