A/C problem. How do I diagnose?

[Saddle Tramp]

The A/c went out on my 2011 Sport with the 4.0. The "pully gear does spin freely by hand and will spin when I first turn on the A/C to any option (defrost, recirc, heat...) but it will have no pressure or speeds like normal. It will make a low noise from the pully before stopping. (Not high pitch squealing from the belt.)

I don't know if it's a fuse, computer module thing, switch, or what. Any ideas?

 

[franklin2]

What is "no pressure or speeds like normal"? How and what pressure are you measuring? What speed of what object are you measuring and how are you measuring it? Are you talking about the blower fan under the dash?

 

[Saddle Tramp]

No readings from measurements. Just noticing the pulley spinning at first then stopping.

The pressure is from the vents. All of them. It's like a low whisper of a breeze instead of a hair dryer of force. This is in all modes.