On mine ('80 coupe) I found the nut and bolt circled on post 7 above very loose a few weeks ago - and in fact the corner ear of the compressor had broken off. I figure I must have accidentally left the nut loose during original installation. I had also misplaced part of the tightening/ adjustment hardware (drinking and my ADHD don't go together very well when doing a project like this!). I cannot imagine that the supplied nut could have worked its way loose -it was one of those self-locking nuts kind of like a nylock but with staked metal instead of nylon; takes a lot of strength to tighten.

I ended up using one long bolt with a spacer tube in the middle to mount the compressor to the bracket - instead of the two short bolts - and torqued it down good with a big washer on the outside of where the broken-off ear has leftt more of a saddle than a nounting hole. It's been working fine that way for a couple of weeks now but I don't trust it for the long haul with a broken ear. One of these days I plan to evacuate the system and rotate the compressor 90 degrees to get off of that broken-off ear mounting point; my recovery machine is down now though - says it needs a new filter.

Cooling is very good even in hot weather but not quite freezing like Eaton describes his. I also plan to upgrade to a parallel flow condenser and a upgrade the aux fan to a w126 fan.