Dayco 22665 Accessory Drive Belt - Fan or Fan and Idler

Overview

Dayco 22665 is an accessory drive belt built for heavy-duty fan and idler applications. It uses a synthetic rubber compound and double-cog construction to handle demanding belt routing while maintaining consistent grip.

Compatible With Ford L9000, LTL9000, CL9000, CLT9000, LT9000, and LTS9000 applications, plus Autocar, White/GMC, and Western Star fitments listed below. The Dayco 22665 part number is also referenced across multiple OE and aftermarket cross numbers for the same application.

Key Features

• Synthetic rubber compound for durable belt construction.
• Double-cog design for flexible operation in routed drive systems.
• Black finish with a .69-inch top width.
• Built to SAE J636 and SAE J637 standards.
• Rated for temperatures from -35 to 175 degrees.

Detailed Description

Dayco 22665 is an accessory drive belt intended for fan and idler drive systems that require a 66.50-inch effective length and a 38-degree angle profile. Its double-cog construction improves flexibility around pulleys, while the synthetic rubber compound supports stable operation across a wide temperature range. This belt is a direct fit for multiple medium- and heavy-duty truck applications, including Ford L9000 and Ford LTS9000 configurations, as well as selected Autocar, White/GMC, and Western Star models. The Dayco 22665 part number appears in interchange listings with ACDelco T22664 and Gates 15A1670 among others for the same application.

What It Is Used For

• Replacing a worn accessory drive belt with visible cracking or glazing.
• Restoring proper fan drive operation when belt tension or grip is reduced.
• Addressing belt noise caused by wear, hardening, or pulley slip.
• Supporting correct drive routing in fan and idler belt systems.

Installation Notes and Tips

Verify belt length, angle, and routing against the existing application before installation. Confirm the listed fan or fan-and-idler position for the vehicle, since fitment varies by model and configuration. Inspect pulleys and tensioning components for wear before installing the new belt.

Quality Assurance

This belt is manufactured to SAE J636 and SAE J637 standards for accessory drive belt applications.