C 3500 Truck 2WD V8-6.6L DSL Turbo VIN 1 (2002)
Drive Belt: Testing and Inspection
Drive Belt Chirping
Drive Belt Chirping Diagnosis
Diagnostic Aids
If a chirp noise occurs during engine shutdown, this is considered normal and is due to the engine's high compression.
The chirping may be intermittent due to moisture on the drive belt(s) or the pulleys. It may be necessary to spray a small amount of water on the drive
belt(s) in order to duplicate the customers concern. If spraying water on the drive belt(s) duplicates the symptom, cleaning the belt pulley may be the
probable solution.
A loose or improper installation of a body component, a suspension component, or other items of the vehicle may cause the chirping noise.
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
2. The noise may not be engine related. This step is to verify that the engine is making the noise. If the engine is not making the noise do not proceed
further with this table.
3. The noise may be an internal engine noise. Removing the drive belt and operating the engine for a brief period will verify the noise is related to the
drive belt. When removing the drive belt(s) the cooling fan will not operate and the engine may overheat. Also DTCs may set when the engine is
operating with the drive belt removed.
4. Inspect all drive belt pulleys for pilling. Pilling is the small balls or pills or it can be strings in the drive belt grooves from the accumulation of
rubber dust.
6. Misalignment of the pulleys may be caused from improper mounting of the accessory drive component, incorrect installation of the accessory drive
