I've had a post on here about my a/c, but decided to start a new thread with some new info. A few weeks ago, my air quit without warning. Then for a few days, it would try to come on, cool for about 10 seconds then bark and quit. Then it wouldn't even come on and make no noise. Today, I had a friend to push the button while I was watching under the hood....the compressor engaged, but turned VERY slowly (there was no squealing sound or anything) then quit....I thought it was locked up and it may be. There are pieces of black debris stuck to the radiator in front of the compressor. How can I tell if it's the clutch or if the compressor is shot?