Wow, this is something to consider. I have a 1997 Wrangler Sport with AC, and I have never heard of this problem. I have heard a lot of clanking at times, like moving screws, when I turn on my AC. I am assuming that someone dropped some screws inside my AC somewhere. I did have this problem with my Mustang GTA years ago. When I finally got the repair experience, I removed the blower housing and removed the screws. Of course, the clanking stopped. I haven't got the repair experience with my 1997 Wrangler yet.
So, are you saying that the leaves and debris came fell into the AC system from the vent, under the windshield wipers, outside the car? If so, how can you clean it out, or check for debris? Is there a video that shows the access and re-assembly? I would hate to have my Jeep burn up. Thanks.