Fan not working. 98 w900

I'm doing some maintence today after my first week in my new truck. My fan doesn't seem to come on automatically or with the switch

First question is what temp should the fan kick on at?

2nd question is I read somewhere that if that truck is off, that the fan should not move and if it does, then it's likely bad. Is this true? Because my fan clutch is free spinning with the truck off.

 

Alright so I took a little diagnosing. Like you said, disconnected the plug from air solenoid and turned on truck, fan is not engaged. Still free spins. I decided to check for air at the solenoid. There IS air coming into it. But I dont want to replace it not knowing if it's an applied air clutch or not. Im going to assume that it requires air to engage it hence looking at the fan clutch there is a gap between the 2 plates.

 

So possibly a bad air solenoid? (And yes I took the air line off). The fan worked 3 weeks ago when I bought it testing it with the manual fan switch(which does not work either turning the fan on)

 

This is the solenoid that my truck uses, but im not sure which type it is.

Valve-Solenoid-Clutch Fan - C4R920DC14R8 - Paccar - Big Rig World

 

Okay so my air valve is a normally close valve. I checked the valve and it's working. And I do have air coming in. So I guess at this piont I need to chase the ground and power to the ecm while checking for breaks.