Four Seasons 46018 Engine Cooling Fan Clutch

Severe Duty Thermal Fan Clutch for Heavy-Duty Cooling

Four Seasons 46018 is a thermal engine cooling fan clutch built for severe-duty and truck applications. It uses a reverse rotation design and a non-electronic, mechanical thermal response to help maintain cooling performance in demanding driving conditions.

Compatible With Chevrolet Silverado 2500 HD, Silverado 3500, Suburban 2500, Avalanche 2500, Express 3500, and GMC Sierra 2500 HD, Sierra 3500, Yukon XL 2500, and Savana 3500 applications listed below.

• Brand: Four Seasons Fan Clutch line
• Part number: 46018
• Thermal, non-electronic fan clutch design
• Severe-duty and truck fan drive style
• Reverse rotation application
• Aluminum construction with raw aluminum finish
• Meets or exceeds OEM requirements
• Performance rated for demanding cooling systems
• Mounting type: HEX
• Fan bolt circle: 3.25 in. / 82.6 mm
• Mount diameter: 1.44 in. / 36 mm

Product Details

The Four Seasons Fan Clutch line focuses on replacement cooling components for vehicles that need consistent fan engagement under load. This Four Seasons 46018 fan clutch measures 6.45 inches in maximum diameter, has an overall height of 3.77 inches, and uses a 4-bolt mounting pattern with M10 x 1.5 hole thread specification. It is a new, severe-duty thermal clutch designed for reverse rotation fan systems found in select Chevrolet and GMC trucks and vans.

This part cross-references Gates 22158 for the same application.

What It Helps Address

• Engine temperature rise during towing or heavy hauling
• Reduced fan engagement in severe-duty cooling systems
• Cooling performance loss from a worn thermal clutch
• Noise or inconsistent operation from an aging fan drive
• Fitment issues when replacing a reverse rotation truck fan clutch

Installation Notes and Tips

Verify reverse rotation, bolt pattern, pilot dimensions, and fan bolt circle before installation. Mounting hardware is not included, so reuse or source the correct hardware separately. Confirm clearance at the clutch-to-mounting flange distance of 1.75 inches and match the vehicle’s cooling fan setup to the listed specifications.

• Fits 2007 Chevrolet Silverado 2500 HD Classic, N/A
• Fits 2007 Chevrolet Silverado 3500 Classic, N/A
• Fits 2007 GMC Sierra 2500 HD Classic, N/A
• Fits 2007 GMC Sierra 3500 Classic, N/A
• Fits 2003-2006 Chevrolet Avalanche 2500, N/A
• Fits 2006 Chevrolet Silverado 1500, N/A
• Fits 2003-2006 Chevrolet Silverado 2500 HD, N/A
• Fits 2003-2006 Chevrolet Silverado 3500, N/A
• Fits 2003-2006 Chevrolet Suburban 2500, N/A
• Fits 2003-2006 GMC Sierra 2500 HD, N/A
• Fits 2003-2006 GMC Sierra 3500, N/A
• Fits 2003-2006 GMC Yukon XL 2500, N/A
• Fits 2002 Chevrolet Avalanche 2500, N/A
• Fits 2001-2002 Chevrolet Express 3500, N/A
• Fits 2001-2002 Chevrolet Silverado 2500 HD, N/A
• Fits 2001-2002 Chevrolet Silverado 3500, N/A
• Fits 2001-2002 Chevrolet Suburban 2500, N/A
• Fits 2001-2002 GMC Savana 3500, N/A
• Fits 2001-2002 GMC Sierra 2500 HD, N/A
• Fits 2001-2002 GMC Sierra 3500, N/A
• Fits 2001-2002 GMC Yukon XL 2500, N/A

Quality Assurance

Four Seasons lists this fan clutch as new, performance rated, and meeting or exceeding OEM requirements. Part number 46018 is built for severe-duty service in reverse rotation cooling systems and is backed by the brand’s cooling component engineering standards.