How do you install a serpentine belt on 87 s-10 a 4-cylinder?

To install a serpentine belt on an '87 S-10 with a 4-cylinder engine, first, locate the belt routing diagram, usually found on a sticker near the radiator or on the engine cover. Use a wrench or ratchet to relieve tension on the belt tensioner, allowing you to remove the old belt. Then, follow the routing diagram to position the new belt around the pulleys, ensuring it sits properly in the grooves. Finally, release the tensioner to apply tension to the new belt, making sure it is correctly aligned before starting the engine.