Four Seasons 46037 Engine Cooling Fan Clutch

Four Seasons 46037 Severe Duty Fan Clutch

The Four Seasons 46037 is a thermal engine cooling fan clutch built for severe-duty and truck fan drive applications. It uses an aluminum construction, reverse rotation operation, and a non-electronic design to support cooling performance in demanding service conditions.

Key Features

• Four Seasons Fan Clutch line for engine cooling service
• Thermal, non-electronic fan clutch design
• Severe duty and truck fan drive style
• Reverse rotation (REV) operation
• Aluminum housing with raw aluminum finish
• 4-bolt mounting pattern with HEX mounting type
• Meets or exceeds OEM requirements
• Performance rated for demanding cooling systems
• Part number 46037 for direct identification

Product Details

Four Seasons 46037 is engineered as a severe-duty engine cooling fan clutch for vehicles that rely on controlled fan engagement to manage operating temperatures. The aluminum body helps keep the assembly durable while maintaining the dimensions needed for proper fitment, including a 7.4-inch maximum diameter, 3.83-inch overall height, 1.86-inch mount diameter, and 1.42-inch pilot diameter. It is a reverse-rotation thermal clutch with a 4-bolt, M8 x 1.25 hole pattern and a 3.81-inch fan bolt circle.

This part is listed for Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD, and GMC Sierra 3500 HD applications, along with Chevrolet Express 2500, Chevrolet Express 3500, GMC Savana 2500, GMC Savana 3500, and select Chevrolet/GMC P-series and Classic HD models. If you are searching for a reverse rotation engine cooling fan clutch for Chevrolet Silverado 2500 HD or GMC Sierra 3500 HD service, Four Seasons 46037 is a direct-fit option for the listed applications.

This part cross-references Dayco 22625 and Anchor 2850 for the same application.

Common Uses

• Restoring proper fan engagement on overheating or temperature-control complaints
• Replacing a worn clutch that causes reduced airflow at idle or low speed
• Addressing fan noise from a clutch that no longer engages correctly
• Supporting cooling performance in severe-duty truck and van applications
• Servicing reverse-rotation cooling systems on listed Chevrolet and GMC models

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 as needed. Confirm clearance around the fan shroud and check the fan blade condition before installing the new clutch. For best results, inspect the water pump, belts, and cooling fan assembly at the same time.

Quality Assurance

Four Seasons 46037 is a new, performance-rated fan clutch that meets or exceeds OEM specifications for the listed applications. It is built for severe-duty cooling service and is intended for direct replacement use on the confirmed vehicle fitments.