[steely]

Yeah, the window relay and switch power, while fused, is hot all of the time pretty much right off of the battery. I sorta don't like that feature. I understand the fundamentals, and I certainly have the training, but my experience with automotive wiring is low. And intermittent probs are just a pain. The 'short' paths would be after the fuse.

hopefully if you can look at the fuse lines, see if you verify the AC / blower wiring as being stock if the PO did some work as you suggest. Maybe make a table. I am hoping it sticks out from the rest, and check that guy out. But i feel like I am grasping after that.

Another 'theory' might be the momentary main power short might cause the AC relay to drop out / open and kill the blower.

Not sure if you or 84's have a sunroof- same power window fuse, and I doubt your are using the seat heaters. Maybe pull that fuse for a while and see if you still get the AC symptoms.