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How to quiet a noisy fan belt 
Ensure your vehicle is equipped with a neoprene belt. 
Most modern vehicles have a serpentine belt instead of a fan belt, though the names may be used interchangeably. Older model vehicles and some high performance applications still utilize fan belts instead of electric fans.
Older belts were made of neoprene and would benefit from the application of belt dressing, but newer epdm-made belts may dry out as a result of using belt dressing. If your fan belt was installed after the year 2000, it is likely an epdm-made belt.