humming noise coming from belt

Asked by Dec 08, 2013 at 11:35 AM about the 2005 Chevrolet Silverado 1500 LS Short Bed 4WD

Question type: Maintenance & Repair

replaced belt and it didn't fix it.

1 Answer

121,185

Probably an idler pulley going bad. Use a piece of PVC pipe or hard vacuum clean hose extension to locate exactly where the noise is coming from. (Use extreme caution). With engine idling carefully position one end of pipe in and around the belt and pulleys while holding the other end of it up to your ear. Doing this will enable you to locate exactly where the noise is coming from.

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