Maybe your car needs a new belt tensioner and idler pulley. Or the serpentine belt itself. Also, do not use Goodyear gatorback serpentine belt, makes a humming noise.
Picture below is the tensioner. It has a spring inside that tightens the belt automatically. Maybe the spring is getting soft and could not tighten the belt well.
Below is the idler pulley. If your car got too many miles, bearing inside tends to wear out.
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Friday, September 17th, 2010 AT 12:12 AM