How do you change serpentine belt Chevy Cobalt?

To change the serpentine belt on a Chevy Cobalt, first, ensure the engine is off and cool. Locate the serpentine belt routing diagram, usually found on a sticker under the hood, and use a wrench or ratchet to relieve tension on the belt by rotating the tensioner pulley. Remove the old belt from the pulleys and install the new belt according to the routing diagram, ensuring it sits properly in the grooves. Finally, recheck the tensioner to ensure it’s functioning correctly and start the engine to verify the installation.