Gates K040378 Serpentine Belt

OE Micro-V Belt for Accessory Drive Systems

The Gates K040378 Premium OE Micro-V Belt is a precision-fit serpentine belt built for accessory drive applications that demand OE-style size, construction, and material matching. It is a direct choice for vehicles needing a 4-rib, K-section belt with reliable tension transfer and consistent belt tracking.

Compatible With select Cadillac Escalade, Chevrolet Silverado, GMC Sierra, and other applications listed below, this belt also serves a range of import vehicles such as Acura, Honda, Hyundai, Isuzu, Mazda, Mitsubishi, Nissan, and INFINITI. The Gates K040378 is commonly searched as a replacement for air conditioning, power steering, fan, and alternator drive positions.

Key Features

• Gates Premium OE Micro-V Belt line for OE-style replacement fit
• Part number K040378 for direct reference and cross-checking
• 4-rib automotive V-ribbed belt construction
• EPDM belt material for durable everyday service
• Polyester cord material for stable belt reinforcement
• OE Performance comparison rating
• Effective length: 37.89 in. / 962 mm
• Outside circumference: 38.5 in. / 978 mm
• Top width: .56 in. / 14 mm

Product Details

Gates Premium OE Micro-V belts are built to match OE size, construction, and materials so the belt follows the original accessory drive layout without unnecessary variation. This K040378 serpentine belt uses EPDM rubber and polyester cord reinforcement to support consistent operation in standard automotive V-ribbed belt systems. It is a practical replacement for vehicles that require a K-section, 4-rib belt in air conditioning, power steering, fan, or alternator positions.

This part cross-references Dayco 5040378 and Continental 4PK962 for the same application. The Gates K040378 is a common lookup for Chevrolet Silverado 1500 air conditioning belt replacement, GMC Sierra 1500 accessory drive belt service, and Cadillac Escalade A/C belt applications.

Vehicle Fitment

• Fits 2002-2008 Cadillac Escalade, Air Conditioning
• Fits 2003-2008 Cadillac Escalade ESV, Air Conditioning
• Fits 2002-2008 Cadillac Escalade EXT, Air Conditioning
• Fits 2007-2008 Chevrolet Avalanche, Air Conditioning
• Fits 2003-2008 Chevrolet Express 1500, Air Conditioning
• Fits 2003-2008 Chevrolet Express 2500, Air Conditioning
• Fits 2003-2008 Chevrolet Express 3500, Air Conditioning
• Fits 1999-2008 Chevrolet Silverado 1500, Air Conditioning
• Fits 1999-2008 Chevrolet Silverado 2500, Air Conditioning
• Fits 2001-2008 Chevrolet Silverado 2500 HD, Air Conditioning
• Fits 2008 Chevrolet Silverado 3500, Air Conditioning
• Fits 2001-2006 Chevrolet Silverado 3500, Air Conditioning
• Fits 2007-2008 Chevrolet Silverado 3500 HD, Air Conditioning
• Fits 2000-2008 Chevrolet Suburban 1500, Air Conditioning
• Fits 2000-2008 Chevrolet Suburban 2500, Air Conditioning
• Fits 2000-2008 Chevrolet Tahoe, Air Conditioning
• Fits 2003-2008 GMC Savana 1500, Air Conditioning
• Fits 2003-2008 GMC Savana 2500, Air Conditioning
• Fits 2003-2008 GMC Savana 3500, Air Conditioning
• Fits 2007-2008 GMC Sierra, Air Conditioning
• Fits 1999-2008 GMC Sierra 1500, Air Conditioning
• Fits 2001-2008 GMC Sierra 2500 HD, Air Conditioning
• Fits 2007-2008 GMC Sierra 3500 HD, Air Conditioning
• Fits 2000-2008 GMC Yukon, Air Conditioning
• Fits 2000-2008 GMC Yukon XL 1500, Air Conditioning
• Fits 2000-2008 GMC Yukon XL 2500, Air Conditioning
• Fits 2003-2008 Hummer H2, Air Conditioning
• Fits 2007 Chevrolet Silverado 1500 Classic, Air Conditioning
• Fits 2007 Chevrolet Silverado 1500 HD Classic, Air Conditioning
• Fits 2007 Chevrolet Silverado 2500 HD Classic, Air Conditioning
• Fits 2007 Chevrolet Silverado 3500 Classic, Air Conditioning
• Fits 2007 GMC Sierra 1500 Classic, Air Conditioning
• Fits 2007 GMC Sierra 1500 HD Classic, Air Conditioning
• Fits 2007 GMC Sierra 2500 HD Classic, Air Conditioning
• Fits 2007 GMC Sierra 3500 Classic, Air Conditioning
• Fits 2002-2006 Chevrolet Avalanche 1500, Air Conditioning
• Fits 2005-2006 Chevrolet Silverado 1500 HD, Air Conditioning
• Fits 2001-2003 Chevrolet Silverado 1500 HD, Air Conditioning
• Fits 2005-2006 GMC Sierra 1500 HD, Air Conditioning
• Fits 2001-2003 GMC Sierra 1500 HD, Air Conditioning
• Fits 2001-2006 GMC Sierra 3500, Air Conditioning
• Fits 1999-2004 GMC Sierra 2500, Air Conditioning
• Fits 1999 Mitsubishi Montero Sport, Fan To Power Steering
• Fits 1996-1998 Acura TL, Power Steering
• Fits 1992-1998 Hyundai Sonata, Air Conditioning
• Fits 1998 Kia Sephia, Air Conditioning
• Fits 1997-1998 Mitsubishi Montero Sport, Fan and Power Steering
• Fits 1996-1997 Acura SLX, Fan and Alternator
• Fits 1994-1997 Ford Aspire, Power Steering and Air Conditioning
• Fits 1994-1997 Honda Passport, Fan and Alternator
• Fits 1993-1997 INFINITI J30, Air Conditioning
• Fits 1993-1997 Isuzu Rodeo, Fan and Alternator
• Fits 1992-1997 Isuzu Trooper, Fan and Alternator
• Fits 1996 Mitsubishi Montero, Fan and Power Steering
• Fits 1990-1996 Nissan 300ZX, Air Conditioning
• Fits 1991-1995 Acura Legend, Power Steering
• Fits 1995 Mitsubishi Montero, Power Steering
• Fits 1990-1993 Mazda Miata, Air Conditioning and Power Steering

Common Uses

• Replacing a worn or cracked air conditioning belt
• Restoring proper accessory drive tension and tracking
• Addressing belt noise, squeal, or glazing
• Correcting loss of drive to power steering, fan, or alternator systems
• Servicing OE-style belt applications on Chevrolet Silverado and GMC Sierra trucks

Installation Notes

Verify the belt section, rib count, and effective length before installation. Confirm routing against the vehicle’s belt diagram and inspect pulleys, tensioners, and idlers for wear before installing the new belt. For fitment searches, this part is frequently referenced for Chevrolet Silverado 1500, GMC Sierra 1500, and Cadillac Escalade accessory drive service.

Quality Assurance

Gates builds this Premium OE Micro-V Belt to OE-style specifications for size, construction, and material matching. The K040378 part number is widely used as a direct replacement reference across domestic and import applications listed in the fitment data.