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The fan clutch was stuck - so it wasn't just the plug. First dozen or more times I added air the fan wouldn't move in and out. It took quite a while to get it unstuck. Once it was moving freely with the air. - I reassembled and started the truck - and the fan stayed on. Found the...

Problem fixed. Took quite a bit of time with the air and some light taps - but it eventually broke free. Amazing how much quieter it is too. Oddly enough - the TDM was unplugged too (wires were underneath the cadillac valve). Plugged it in and the fan disengaged. Took it for a ride until it...

Sorry if this is an obvious question - but - disconnect it at the clutch (see pic)? Should I expect to lose any fluid when I disconnect it? thx D

Interesting. My HMMWV never gets above 190 degrees - and I've never heard that "loud" sound of the fan coming on - now I know why . . . Must be on all the time. I'm going to check the clutch pack tomorrow. Where do I apply air to try to get everything to move? What psi? Thx -D