Most belt noise is caused when one of two conditions. Either the belt is loose or it is worn (indicated by smooth shiny surface on the pulley side) and should be replaced.
Chances are if you're hearing a noise from a particular year, make and model car or truck you're not the only one. In fact, the manufacturer is probably way ahead of you and has issued an alert to the dealership service department. It's possible they have even developed improved parts to eradicate the problem.
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