How do you change a serpentine belt on a Volvo?

To change a serpentine belt on a Volvo, first, ensure the engine is cool and disconnect the negative battery terminal for safety. Then, locate the tensioner pulley and use a wrench to relieve tension on the belt, allowing you to slide it off the pulleys. Remove the old belt and route the new belt according to the diagram usually found on a sticker under the hood. Finally, reapply tension using the tensioner, double-check the belt alignment, and reconnect the battery.