How to Replace an Audi A4 Serpentine Belt

1. Loosen the bolt on the tension pulley using a belt tensioner.
2. Pull the belt off of the alternator, water pump, tension pulley and any other devices it is attached to using your hands.
3. Inspect the new belt to make sure there are no breaks or cracks on either side of it.
4. Place the new belt over all of the pulleys that you removed the old belt from. Double check to make sure that the raised parts of the belt are properly seated in all the grooves of the pulleys.
5. Tighten the bolt on the tension pulley using the belt tensioner.