Changing the serpentine belt on a 05 Chevy Avalanche?

To change the serpentine belt on a 2005 Chevy Avalanche, first, make sure the engine is off and cool. Locate the serpentine belt routing diagram, usually found on a sticker under the hood, to understand how the belt is positioned. Use a wrench to relieve tension on the tensioner pulley, then carefully slide the old belt off and replace it with the new one, ensuring it follows the correct routing. Finally, release the tensioner and check that the belt is properly seated on all pulleys before starting the engine.