How do you install ac drive belt on 2002 montero sport 3.5L Bolt does not loosen pulley only tightens it?

To install the AC drive belt on a 2002 Montero Sport 3.5L, you must first locate the tensioner pulley. Instead of trying to loosen the bolt, use a socket or wrench to rotate the tensioner in the direction specified in the vehicle manual, which typically releases tension on the belt. Once the tension is released, you can slip the old belt off and install the new belt, ensuring it follows the correct routing. Finally, release the tensioner to tighten the belt, ensuring it's properly seated on all pulleys.