Mechanic Mondays! - Inspecting Your Vehicle's Belts
Step 1: Check for cracking. The belt needs to be inspected for cracking. As the belt ages, the rubber becomes brittle which will cause it to crack. Once the belt begins to crack, it should be replaced as it can fail at any time.
Step 2: Check the edge wear. If the belt is showing signs of wearing on its outer edge, then it will need to be replaced. Prior to replacing the belt, you will need to diagnose why it is wearing in this manner. If a belt is showing outside edge wear then that is an indication that the belt is misaligned. This can be caused by a failing pulley, a loose accessory, or possibly a warped pulley.