During a lovely hour-long trip in 100 degree heat I noticed the AC stopped blowing cold, followed shortly thereafter by a crunchy crunchy noise. After pulling over I got this pic, but before I try ordering parts, I'd love some confirmation on this. I assume that this is the pulley on the accessory belt for the AC compressor, but my quick visual inspection does not show any problem with the belt - and I can't work out how just the back side (not visible) of the pulley could drop out like this. I look to you oh experts for identification (dead center in the image, yet far away) before I start yanking things apart.