Astro Van 2WD V6-4.3L VIN X (2002)
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
capacity. 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 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 belt(s) or the accessory drive components. When removing the drive belt the water
pump may not be operating and the engine may overheat. DTCs may set if 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 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 correct
inspection and replacement procedure.
