How do you put a serpentine belt on a 1991 jeep cherokee?

To install a serpentine belt on a 1991 Jeep Cherokee, first, locate the belt routing diagram, usually found on a sticker under the hood. Loosen the tensioner pulley using a wrench or ratchet to relieve tension on the old belt, then remove the old belt. Route the new belt according to the diagram, ensuring it sits properly on all pulleys. Finally, re-tighten the tensioner to secure the new belt in place.