How do you change a fan belt on a 1999 Hyundai Sonata?

To change the fan belt on a 1999 Hyundai Sonata, first, ensure the engine is off and cool. Loosen the tensioner pulley using a wrench to relieve tension on the belt, then remove the old belt from the pulleys. Install the new belt by following the correct routing diagram, usually found on a sticker under the hood. Finally, re-tighten the tensioner and check the belt's alignment before starting the engine.