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Test Description

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The number(s) below refer to the step number(s) on the diagnostic table.

  1. 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.
  2. 4. The inspection should include checking the drive belt tensioner 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.
    Fig 1: Drive Belt Whine Diagnosis
    G01977334Courtesy of GENERAL MOTORS CORP.
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