Dayco 5040382 Serpentine Belt

Dayco 5040382 Serpentine Belt Overview

The Dayco 5040382 serpentine belt is a K-section, 4-rib accessory drive belt built from EPDM with aramid reinforcement for consistent operation across a wide temperature range. It is used on select Mercedes-Benz AMG GT air conditioning applications, BMW hybrid and SUV applications, and older Chrysler, Dodge, Mitsubishi, Nissan, and Kia vehicles that call for this belt size.

For buyers searching for a Dayco 5040382 serpentine belt, this part is a direct-fit option for many accessory drive systems that rely on a 4-rib, straight-rib profile. It also cross-references Gates K040382 for the same application.

Key Features

• Brand: Dayco
• Part number: 5040382
• EPDM construction with aramid reinforcement for durability
• 4-rib, K-section design with straight rib profile
• Black finish
• Effective length: 38.20 in. / 970.28 mm
• Outside circumference: 38.86 in. / 987.05 mm
• Top width: 0.54 in.
• Operating temperature range: -45°F to 212°F
• Built to SAE J1459 and SAE J2432 standards

Detailed Description

Dayco 5040382 is an accessory drive serpentine belt engineered for vehicles that require a 4-rib K-section belt with a 38.20-inch effective length. The EPDM rubber compound helps maintain belt performance under heat and cold cycling, while aramid reinforcement adds strength for accessory drive loads. This belt is specified across a broad range of applications, including 2024-2026 Mercedes-Benz AMG GT 55 and AMG GT 63 air conditioning systems, 2021-2024 BMW 330e and 330e xDrive, and older platforms such as the 1989-1995 Dodge Caravan and 1990-1996 Nissan 300ZX.

Use the Dayco 5040382 when replacing a worn serpentine belt on vehicles with matching belt routing and rib count. Common fitment searches include Mercedes-Benz AMG GT air conditioning belt, BMW 530e accessory drive belt, and Chrysler/Dodge alternator and water pump belt applications.

What This Belt Helps Address

• Squealing or chirping from a worn accessory drive belt
• Cracking, glazing, or rib wear on the belt surface
• Loss of proper drive to air conditioning, power steering, alternator, or water pump systems
• Belt slippage caused by age, heat, or contamination
• Incorrect belt length or rib count during replacement

Installation Notes and Tips

Verify the belt routing, rib count, and measured length against the original belt before installation. Confirm the application position listed for your vehicle, such as air conditioning, power steering, fan and alternator, or alternator and water pump, since the same part number can be used in different accessory drive layouts. Inspect pulleys, tensioners, and idlers for wear before installing the new belt, and make sure all grooves are clean and aligned.

Fits 2024-2026 Mercedes-Benz AMG GT 55, Air Conditioning; fits 2024-2026 Mercedes-Benz AMG GT 63, Air Conditioning; fits 2021-2024 BMW 330e and 330e xDrive, N/A; fits 2001-2005 Kia Rio, Air Conditioning and Power Steering.

Quality Assurance

This Dayco belt is manufactured to SAE J1459 and SAE J2432 standards for accessory drive belt applications. The EPDM and aramid-reinforced construction supports consistent belt performance in demanding underhood conditions.