A metal on metal grinding noise seems to be coming from my AC Clutch. There is noise when the AC is on or off, however the noise changes when on or off. I believe it may be a bearing in the AC clutch. Does anyone have any ideas and a procedure for changing the bearing(s) and / or clutch? Thanks

The noise seemed to have gotten better and now it seems back again. It appears that there is no gap at the clutch plate. What is the gap supposed to be and how do you adjust the gap?