Why My Jeep Cherokee Kept Shredding Serpentine Belts

My 1997 Jeep Cherokee XJ started squealing and fraying its serpentine belt after only about 10,000 miles. I pulled the old one off, spun every pulley by hand, and found the real culprit. Spoiler: it was a problem. And it turned into a three-part saga. Next time, I try stealing the pulley off my '87. Parts: Gates Micro-V Serpentine Belt K060950: https://amzn.to/4jUI5KB As an Amazon Associate I earn from qualifying purchases. Jeep parts from my part-outs: https://www.ebay.com/usr/rl-motors Chapters: 0:00 The problem 1:07 Getting started 3:25 Fan out 5:02 Belt off 5:37 The old belt 6:24 Spinning the pulleys 6:49 Belt history 7:39 Idler pulley inspection 9:27 New belt 11:07 Found the culprit 12:23 AC pulley 12:50 Donor Comanche 13:21 To be continued