Join Date: Oct 2005
Location: Swamps of Louisiana
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2002/03 F-Series and Excursion Belt Squeal; 99-01 with Replaced Belts:
Some 7.3 engines may exhibit a loud squeal noise from the engine area when the engine is under load and the fan clutch is locked up, typically in hot and dusty conditions. Another complaint may be the fan clutch oscillating or not locking up. This may be due to dust accumulating on the back side of the belt and causing it to slip on the water pump pulley. This usually affects only 2002 model/year vehicles, but may occur in trucks built from 99-01 if the belt was replaced after July 01. On single rear wheel trucks, replace the serpentine belt with P/N 1C2Z-8620-NA on single-alternator engines, and 1C2Z-8620-PA on dual-alternators. Broadcast Message 3848.
A service kit has been released for 2002 trucks only. It includes a belt, tensioner and water pump pulley. Use 2C3Z-8620-AA for single alternator and 2C3Z-8620-BA for dual alternators. Broadcast Message 0718.