high-pitched squealing noise is caused by a glaze that develops on the outer surface of the belt, which may be due to pulley misalignment and/or slippage (loss of belt tension or a weak automatic tensioner). The noise does not affect belt operation or reliability (unless it is slipping), but the noise can be very annoying. Belt replacement is the only way to get rid of the noise. You can spray a noisy belt with aerosol belt dressing lubricant. These products will often quiet belt noise for awhile, but sooner or later the noise will come back. The best fix is a new belt, or to replace the belt tensioner if it is weak and is allowing the belt to slip.
Sunday, December 27th, 2009 AT 9:29 PM