How do you change the serpentine belt tensioner on a '97 Cavalier W24 L engine?

To change the serpentine belt tensioner on a '97 Cavalier W24 L engine, first, ensure the engine is off and cool. Locate the tensioner, then use a wrench or socket to rotate it counterclockwise, releasing tension on the serpentine belt. Remove the belt from the tensioner and the other pulleys, then unbolt the tensioner from its mounting bracket. Install the new tensioner, re-thread the serpentine belt according to the routing diagram, and finally, check the tension and alignment.