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Hi, my name is***** the belt getting damaged on the inside or the outside edge?
Ok, the only way the belt is going to shred apart is if it is getting cut by one of the pulleys. You need to inspect all of the pulleys on the inner and outer edges to see if there is damage to the edge of the pulley that would cut the belt. Once the belt starts to fray apart it continues until it eventually shreds. Run your hand around every pulley to check for damage. It only takes a little ding in a pulley to cut the belt as it rotates past. The pulleys should be perfectly smooth all the way around and on the surface where the belt rides. Belt alignment should also be checked but it is unlikely that anything is out of alignment unless the car has been in an accident or work was done on one of the rotating components and it was not installed properly.
Ok, let me know if you need anything else.