How do you replace a tensioner pulley on a 2000 Oldsmobile intrigue?

To replace the tensioner pulley on a 2000 Oldsmobile Intrigue, first, disconnect the negative battery terminal for safety. Then, use a wrench or socket to relieve tension on the serpentine belt by turning the tensioner pulley counterclockwise. Remove the old tensioner pulley by unbolting it and then install the new pulley in its place, securing it with bolts. Finally, reattach the serpentine belt, ensuring it's properly aligned, and reconnect the battery terminal.