Four Seasons 36996 Engine Cooling Fan Clutch

Four Seasons 36996 Severe Duty Fan Clutch

The Four Seasons Fan Clutch 36996 is a thermal engine cooling fan clutch built for severe-duty and truck fan drive applications. It uses an aluminum housing, standard rotation, and a flange mount with 4 bolt holes for direct replacement in a wide range of Ford, Chevrolet, and GMC vehicles.

Compatible With Ford F-250, F-350, E-250 Econoline, E-350 Econoline, Chevrolet C10, K10, K20, K30, and GMC C1500, K1500, K2500, and related applications across 1970-1997 model years.

• Thermal fan clutch for standard rotation cooling fan systems
• Severe-duty style for truck and heavy-use cooling demands
• Aluminum construction with raw aluminum finish
• Flange mounting type with 4 bolt holes and 5/16-18 hole thread
• Non-electronic design for mechanical fan drive systems
• Meets or exceeds OEM requirements
• Performance rated for demanding cooling applications

Product Details and Fitment

Four Seasons 36996 is a severe-duty thermal fan clutch with a 6.45-inch maximum diameter, 3.66-inch overall height, 0.75-inch pilot diameter, and 0.63-inch pilot depth. The 3.25-inch fan bolt circle and 2.58-inch mount diameter support common truck and van cooling fan setups. This part cross-references Gates 22052 for the same application.

As part of the Four Seasons Fan Clutch line, this unit is aimed at replacement cooling service where consistent fan engagement matters. It is a direct-fit style option for older Ford truck and van platforms as well as Chevrolet and GMC full-size trucks, vans, and utility models that use a thermal, standard-rotation fan clutch.

What It Helps Address

• Engine overheating caused by a worn or slipping fan clutch
• Reduced fan engagement at idle or low-speed driving
• Cooling performance loss in towing, hauling, or severe-duty use
• Noise or inconsistent operation from an aging mechanical fan drive
• Fitment issues when replacing an OEM-style thermal fan clutch

Installation Notes and Tips

Verify standard rotation, flange mounting, pilot diameter, and fan bolt circle before installation. Mounting hardware is not included, so reuse or source the correct hardware separately. Confirm clearance around the fan shroud and radiator, and match the vehicle’s original cooling fan configuration before final assembly.

Quality Assurance

Four Seasons 36996 is a new, performance-rated fan clutch that meets or exceeds OEM specifications for the listed applications. It is built for severe-duty service and direct replacement use in compatible Ford, Chevrolet, and GMC cooling systems.