The AC in my 06 stopped working the other day (sort of) the little light on the button lights up but it is only blowing warm air. If I turn it off and on a few times sometimes it will start working (once it does blows lots of cold air). When the AC is working I noticed that the truck sort of vibrates at an idle, almost an engine surge. Yesterday I also noticed a clicking sound while it was working so I looked at the pump and it appears to be cycling on and off, the surge and the cycle are about 1 second intervals or so.

I am guessing that the clutch has gone bad......?