2011 Jetta ac issue

So I think I have a rcv issue but quick question. When car is running with ac on the ac pully is spinning but what looks like the ac clutch(I know my compressor doesnt have a regular clutch) is not spinning. With car off I can reach down and turn it and there is some resistance bit its smooth. So my question is does the rcv engage that to cause it to spin when a.c. is called for? Or is something sheared off on my compressor?

No clutch, but the coupling is designed to break so that a seized up compressor does not lock up the accessory belt.

But my question is should it turn by hand without car running

sure.

the pulley always turns the insides of the compressor, and the compressor input and output are tied through the system, which includes liquid and gas R134a.

The electrically operated control valve varies the volume of the pump, and how much is pushed for each rotation of the shaft.

https://www.youtube.com/watch?feature=player_detailpage&v=DPuYF0eNK6M

Sometimes the sheer pins break off, your compressor will need to be replaced.

I have seen this several times, and there seemed to be no reason for it to happen (meaning the compressor seemed fine otherwise).

Well decided to change compressor, dryer, and expansion valve. All good so far except can't get lower line off expansion valve. Upper came off fairly easy. Any tips?