Sierra 3500 4WD V8-8.1L VIN G (2006)
water pump with a known, good water pump.
10. Accessory drive component brackets that are bent, cracked, or loose may put an extra strain on that accessory drive component causing it to
vibrate.
Step 1 - Step 11
Drive Belt Whine Diagnosis
Drive Belt Whine Diagnosis
Diagnostic Aids
The drive belt(s) will not cause the whine.
If the whine is intermittent, verify that it is not the accessory drive component(s) by varying their loads, making sure they are operating to their
maximum capacity. An overcharged air conditioning (A/C) system, a power steering system restriction or the incorrect fluid, or a failing generator are
suggested items to inspect.
Test Description
The number(s) below refer to the step(s) in the diagnostic table.
