How do you change a serpentine belt on a Dodge Magnum?

To change the serpentine belt on a Dodge Magnum, start by disconnecting the negative battery terminal for safety. Use a ratchet and socket to relieve tension on the belt by turning the tensioner pulley counterclockwise. Remove the old belt from the pulleys, then route the new belt according to the belt routing diagram, which is usually found on a sticker under the hood. Finally, reapply tension to the belt by releasing the tensioner and reconnect the battery terminal.