Drive Belt Whine

Drive Belt Whine Diagnosis





Diagnostic Aids
The drive belts will not cause the whine noise. If the whine noise is intermittent, verify the performance of each accessory drive components by varying the loads, forcing each component to operate to the maximum capacity. Inspect for the following conditions:
- An overcharged A/C system
- A restricted power steering system
- The use of the wrong power steering fluid
- A failing generator

Test Description
The numbers below refer to the step numbers on the diagnostic table.
3. This test is to verify that the noise is being caused by the drive belts 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 tensioner, and the drive belt idler pulley bearings. The drive belts 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.