How do you change a serpentine belt on a 2006 Buick Terraza?

To change the serpentine belt on a 2006 Buick Terraza, first, ensure the engine is off and cool. Locate the belt routing diagram, usually found on a label under the hood, to guide you. Use a wrench or ratchet to relieve tension on the tensioner pulley, then carefully remove the old belt. Finally, install the new belt according to the routing diagram, ensuring it is seated correctly on all pulleys before releasing the tensioner.