Gates K040337SF Serpentine Belt - Air Conditioning

Gates Stretch Fit Belt for OE Applications

The Gates K040337SF is a Premium OE Stretch Fit Micro-V Belt built for accessory drive systems that use a stretch-fit design. It is made for air conditioning drive applications on select Cadillac, Chevrolet, and GMC trucks and SUVs, including Silverado, Sierra, Tahoe, Yukon, and Escalade models.

Gates Micro-V Stretch Fit belts use self-tensioning technology to match the requirements of stretch-fit systems and maintain proper belt operation without a conventional tensioner. The K040337SF is an OE Exact and OE Performance replacement for vehicles that call for a 4-rib, K-section belt with EPDM construction and nylon cord reinforcement.

Key Features

• Part number: K040337SF
• Premium OE Stretch Fit Micro-V Belt for accessory drive systems
• 4-rib, K-section automotive V-ribbed belt
• EPDM belt material with nylon cord reinforcement
• Effective length: 33.78 in. / 858 mm
• Outside circumference: 34.375 in. / 873 mm
• Top width: .56 in. / 14 mm
• OE comparison rating: OE Exact and OE Performance
• Fits air conditioning applications on select Cadillac, Chevrolet, and GMC vehicles

Product Details

Built for stretch-fit accessory drive systems, the Gates K040337SF is engineered to install on the specified application without relying on a standard adjustable tensioner. Its EPDM construction is suited for modern belt-drive environments, while the nylon cord helps support dimensional stability in service. This part number is used across multiple GM platforms, including 2022-2026 Chevrolet Tahoe, 2021-2025 GMC Sierra 1500, and 2015-2021 Cadillac Escalade air conditioning applications. This part cross-references 4K337SF and 25-040337SF for the same application.

What It Helps Address

• Squealing or slipping from a worn stretch-fit belt
• Cracking, glazing, or rib wear on the accessory drive belt
• Loss of air conditioning compressor drive due to belt deterioration
• Incorrect belt length on OE stretch-fit systems
• Fitment issues on GM trucks and SUVs that require a stretch-fit Micro-V belt

Installation Notes

Installation requires a 3 mm zip tie and the included Sheet E instructions. Because this is a stretch-fit belt, proper installation technique is important for correct seating and belt life. Verify the vehicle application and position before installation. Fits 2022-2026 Chevrolet Tahoe, Air Conditioning; Fits 2021-2025 GMC Sierra 1500, Air Conditioning; Fits 2015-2021 Cadillac Escalade, Air Conditioning.

Quality Assurance

Gates supplies OE-style belt solutions for stretch-fit drive systems and continues to expand coverage for this application type. The K040337SF is built to OE Exact and OE Performance standards for the listed vehicles and air conditioning positions.