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DRIVE BELT CHIRPING, SQUEAL, AND WHINE DIAGNOSIS Diagnostic Aids A chirping or squeal noise may be intermittent due to moisture on the drive belts or the If the noise is intermittent, verify the accessory drive components by varying their loads A chirping, squeal or whine noise may be caused by a loose or improper installation of a The drive belts will not cause a whine noise. Test Description The numbers below refer to the step numbers on the diagnostic table. 2: The noise may not be engine related. This step is to verify that the engine is making the 3: The noise may be an internal engine noise. Removing the drive belts one at a time and 4: Inspect all drive belt pulleys for pilling. Pilling is the small balls or pills or it can be Restricted or kinked PCV hose or engine vent hose Leaking (damaged) PCV hose Vacuum hoses worn or not properly installed Stalling or slow idle speed Inspect for any of the following conditions: Restricted or kinked engine vent hose Leaking (damaged) PCV hose High idle speed Inspect for a leaking (damaged) PCV hose Sludge in the engine Inspect for restricted or kinked PCV hose or engine vent hose
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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