How do you replace ac belt on 2002 Chevy Avalanche?

To replace the AC belt on a 2002 Chevy Avalanche, first, ensure the engine is off and cool. Locate the serpentine belt routing diagram, usually found on a sticker under the hood, to identify the correct path. Use a wrench to relieve tension from the tensioner pulley, then remove the old belt. Install the new belt following the routing diagram, ensuring it sits properly on all pulleys, and reapply tension to the tensioner.