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Message: <blockquote data-quote="CapitalistPig" data-source="post: 1993638" data-attributes="member: 642180">I have been told that it is the belt tensioner (serpentine) but the sound does not appear to be coming from the tensioner. I can definitively feel some vibration when I place a screwdriver to the pulley bolt but then again I am not sure if this is normal. If the belt is removed can I start the car to eliminate the tensioner? The noise does not get worse when the AC is on or the car is driving which I would assume should happen if the tensioner was bad.I apologize for the lack of details. 2003/ V6.</blockquote>