Gates K040409 Serpentine Belt - Air Conditioning

Gates Premium OE Micro-V Belt K040409

The Gates Premium OE Micro-V Belt K040409 is a precision-fit serpentine belt built for accessory drive applications that demand OE-style sizing and construction. It uses EPDM rubber and polyester cord reinforcement to help maintain consistent belt performance in the vehicle’s air conditioning drive system.

For Mercedes-Benz owners looking for a direct-fit A/C belt, this Gates Micro-V belt is engineered to match original equipment dimensions and materials. It is a practical replacement for select Mercedes-Benz G550, C63 AMG, GLC63 AMG, S560, AMG GT, and related models.

Key Features

• Brand: Gates Premium OE Micro-V Belt
• Part number: K040409
• Serpentine belt / automotive V-ribbed belt, standard type
• EPDM construction for durability in accessory drive service
• Polyester cord material for belt stability
• 4-rib design with K cross section
• OE performance grade with OE-size, OE-construction focus
• Effective length: 40.94 in. (1040 mm)
• Outside circumference: 41.57 in. (1056 mm)
• Top width: 0.56 in. (14 mm)

Product Details

Gates Premium OE Micro-V belts are built for import and domestic vehicles, with construction that follows original equipment specifications for size, materials, and fit. The K040409 is a 4-rib serpentine belt used in air conditioning applications on select Mercedes-Benz vehicles, including the Mercedes-Benz G550, Mercedes-Benz C63 AMG, and Mercedes-Benz AMG GT. If you are replacing a worn Mercedes-Benz air conditioning belt, this part number provides a direct OE-style reference for the correct accessory drive belt profile.

This part cross-references Bando 4PK1040 and other listed interchange numbers for the same application.

What It Helps Address

• Squealing or chirping from a worn A/C drive belt
• Cracking, glazing, or fraying on the existing serpentine belt
• Loss of proper accessory drive tension due to belt wear
• Air conditioning belt replacement during routine maintenance
• Fitment issues caused by incorrect belt length or rib count

Installation Notes and Tips

Verify the belt routing and compare the old belt length, rib count, and profile before installation. Confirm the application by vehicle year, model, and position, since this belt is listed for air conditioning use on specific Mercedes-Benz platforms. Inspect pulleys and tensioner components for wear before installing the new belt to help avoid premature belt damage.

• Fits 2018-2022 Mercedes-Benz G550, Air Conditioning
• Fits 2016-2021 Mercedes-Benz C63 AMG, Air Conditioning
• Fits 2015-2021 Mercedes-Benz C63 AMG S, Air Conditioning
• Fits 2018-2021 Mercedes-Benz GLC63 AMG, Air Conditioning
• Fits 2018-2021 Mercedes-Benz GLC63 AMG S, Air Conditioning
• Fits 2018-2021 Mercedes-Benz S560, Air Conditioning
• Fits 2019-2020 Mercedes-Benz G63 AMG, Air Conditioning
• Fits 2018-2020 Mercedes-Benz Maybach S560, Air Conditioning
• Fits 2020 Mercedes-Benz Maybach S650, Air Conditioning
• Fits 2018-2019 Mercedes-Benz AMG GT, Air Conditioning
• Fits 2019 Mercedes-Benz AMG GT 63, Air Conditioning
• Fits 2019 Mercedes-Benz AMG GT 63 S, Air Conditioning
• Fits 2018-2019 Mercedes-Benz AMG GT C, Air Conditioning
• Fits 2018-2019 Mercedes-Benz AMG GT R, Air Conditioning
• Fits 2018-2019 Mercedes-Benz AMG GT S, Air Conditioning
• Fits 2018-2019 Mercedes-Benz E63 AMG S, Air Conditioning
• Fits 2019 Mercedes-Benz S560L, Air Conditioning
• Fits 2018-2019 Mercedes-Benz S63 AMG, Air Conditioning
• Fits 2018 Mercedes-Benz G550 4x4, Air Conditioning

Quality Assurance

Gates manufactures OE-focused belt products using materials and construction intended to match original equipment requirements. The Premium OE Micro-V Belt line is built for consistent fit and performance in accessory drive systems, making the K040409 a dependable replacement choice for the listed Mercedes-Benz applications.