I don't know about your fan clutch, but mine works by applying air to the clutch to disengage the fan. With the engine off and air up, remove the air line to the cluch, apply 12v to the solinoid by use of a jumper. If that works, try using the trucks 12v, key on, not running. If that works okay, reattach the air, apply 12v, (do not start engine), and smack the fan clutch hub with a hammer, and see if the fan rotates freely. If air goes where it supposed to, you're good to the clutch. If it won't break loose, rebuild or replace the clutch assy.
You get all that??? (mine likes to stick if it's been sitting for awhile)
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