Envoy 2WD V8-5.3L VIN M (2005)
Drive Belt Whine
Drive Belt Whine Diagnosis
Diagnostic Aids
The drive belts will not cause the whine.
If the whine is intermittent, verify that it is not the accessory drive components 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 numbers below refer to the steps in the diagnostic table.
3. This test is to verify that the whine is being caused by the accessory drive components. Remove the drive belts and operate the engine for a few
seconds, this will verify if the whining noise is related to the accessory drive component. With the drive belts removed the water pump will not
operate and the engine may overheat. Also diagnostic trouble codes (DTCs) may set when the engine is operated with the drive belts removed.
4. This 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
removal and installation procedure.
