F 150 4WD V8-5.4L VIN V Flex Fuel (2007)
V-Ribbed Serpentine Belt With Piling
7. There should be no chunks missing from the belt ribs. If the belt shows any evidence of this, install a new accessory drive belt.
V-Ribbed Serpentine Belt With Chunks of Rib Missing
8. If the concern is not visually evident, verify the symptom and GO to Symptom Chart. See: Symptom Related Diagnostic Procedures