How do you replace the ac belt?

To replace the AC belt, first, ensure the engine is off and cool. Locate the AC compressor and identify the belt routing diagram, usually found on a sticker in the engine compartment. Loosen the tensioner pulley using a wrench or socket to relieve tension on the old belt, then remove it. Install the new belt following the routing diagram, ensuring it's seated correctly on all pulleys, and then re-tighten the tensioner before starting the engine to check for proper operation.