My belt is perfect. No fraying, no shiny spots, no cracks, it's tight. I can't turn the compressor pulley by hand...but I can turn the inside part that engages and starts turning when the button is pushed. The belt isn't slipping. There are pieces of black stuff in the direct vicinity of the compressor...but it isn't belt material...it looks like greasy pieces of soot that came out of my VW TDI intake when the EGR was cleaned...but the belt is totally intact...I watched the compressor try to start yesterday...the outer pulley didn't even slow down when it engaged...but the inner part barely turned. Either the compressor is trying to lock up or the clutch is not holding the compressor tight enough to compress.