1995 Olds Delta 88 3.8 75k mi. AC cuts in and out

Just bought this cherry from a friend who's a dealer. Awesome for my needs, it's a train car 4 days a week, then a 30 min ride to a local office once a week.

I noticed that sometimes I have ac, and other times not.

It will sometimes not blow cold when I turn it on, other times it will blow cold, but then get warm for 10 minutes or so, then blow cold again. Other times once it's warm, I have to just give up and open the windows. Same symptoms if I use direct air or recirculate. I've tried turning the knobs around in all directions wondering if a baffle was stuck, but there is no change regardless of the setting. I can notice a power change when I hit the ac button on so I know it's engaging something at least.

I'm no mechanic by any measure, but I don't mind getting my hands dirty. I presume this is some sort of a clutching type failure. I wonder if you could give me some direction, perhaps I'll try the repair myself if it's not very complicated.