C 1500 Truck 2WD V6-4.3L VIN W (2001)
Diagnostic Aids
The drive belt(s) will not cause the whine noise.
If the whine noise is intermittent, verify the accessory drive components by varying their loads making sure they are operated to their maximum. Such
items but not limited to may be an A/C system overcharged, the power steering system restricted or the wrong fluid, or the generator failing.
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
3. This test is to verify that the noise is being caused by the drive belt(s) or the accessory drive components. When removing the drive belt the water
pump may not be operating and the engine may overheat. Also DTCs may set when the engine is operating with the drive belt removed.
4. The inspection should include checking the drive belt pensioner and the drive belt idler pulley bearings. The drive belt(s) may have to be installed
and the accessory drive components operated separately by varying their loads. Refer to the suspected accessory drive component for the proper
inspection and replacement procedure.
