Maybe semantics in text or logic... or
My logic IMO. Fact, Clutch is always engaged. Just try and turn it with the engine off. No can do. It will be locked to the hub, pulley and belts. Normal.
With 30 to 90 plus PSI, it will disengaged and should free wheel. Anything different at this point, clutch is BROKEN.
When electrical power is applied to Cadillac solenoid valve, power steering pressure will flow thru valve to the clutch for the disengage condition. (a cold engine start)
During normal conditions "disengaged" is most of the time... unless a hot engine temp switch cycling "open" or a kick down override for 20+/- seconds from the TDM. All system components working correctly.
This topic comes up some of the time, a lot, everytime on "new to me" owners. It is simple when you get your head wrapped around it and all the parts play nice. IMO and as a owner-driver-hobbyist it's one system that should be clear. It's a bad time to try and figure it out on the trail.
I would bet a donut that a LOT of trucks are running around with stuck fans as "the new normal" Wait till winter, never warm enough and always LOUD and no power. Another donut please. LOL
Here's my quickie goto for most simple problems. The free owners manual >
https://hummerhuren.files.wordpress.com/2013/01/hmmwv_test-diagnostics.pdf <
See section 1. First one right out of the gate. Must be important.
Maybe it's just me, CAMO