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I have not tried to rotate the fan by hand so I can't be positive on that aspect, but it would appear that should be how it works. i would start by loosening the fan clutch air line at the output of the solenoid to verify that there is no air pressure trapped in the line. My solenoid was flaky...

An easy test for the function of the solenoid only is to start the truck, let it run and wait for the fan to disengage when air pressure builds to normal. If you then shut the truck off, which kills power to the solenoid, you should immediately hear the solenoid vent the air that is in the line...

OOO Kaay_ Dismantled fan clutch solenoid for the third time. This time I put a tiny bit of 30 weight motor oil on the rubber pads that seat on the cones at each end of the solenoid. Magically, the solenoid is now operating as advertised. A good friend once told me that EVERYTHING works...

Dont think it will matter in this situation. No power is applied to the solenoid when it engages the fan clutch. The solenoid is normally powered up to pass air to the clutch to keep it from engaging. This problem is occurring when the solenoid is powered down. It is a block and bleed...

Spent the afternoon troubleshooting why the fan clutch does not engage at proper temp. Clutch is working as advertised when air is removed. When power is removed from quick exhaust solenoid it does not exhaust air in the clutch circuit to allow the clutch to engage. Dismantled solenoid and...