How do you change the idler pulley on a 2007 Pontiac vibe?

To change the idler pulley on a 2007 Pontiac Vibe, first, ensure the engine is off and cool. Remove the serpentine belt by using a wrench to release tension on the tensioner pulley. Unscrew the bolts securing the idler pulley and remove it. Install the new idler pulley in reverse order, ensuring it’s properly secured, and then re-route the serpentine belt over the pulleys as per the belt diagram.