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. [substeps] If your fan belt was installed after the year 2000, it is likely an epdm-made belt.
[header] How to quiet a noisy fan belt [title] Ensure your vehicle is equipped with a neoprene belt. [step] 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.