Four Seasons 36987 Engine Cooling Fan Clutch

Four Seasons 36987 Severe Duty Fan Clutch

Four Seasons 36987 is a thermal engine cooling fan clutch built for severe-duty service and reverse rotation applications. It is a new, non-electronic aluminum fan clutch that meets or exceeds OEM requirements for demanding truck and van cooling systems.

Key Features

• Severe duty thermal fan clutch for truck and high-output cooling applications
• Reverse rotation design for listed Chevrolet and GMC fitments
• Aluminum construction with raw aluminum finish
• Flange mounting type with 4 bolt holes and M10 x 1.5 bolt thread
• Performance rated and meets or exceeds OEM specifications
• Non-electronic design for mechanical cooling fan control
• Four Seasons Fan Clutch line for replacement cooling system service

Product Details

The Four Seasons Fan Clutch line is built for replacement cooling system service where consistent fan engagement matters. Part number 36987 uses a thermal, severe-duty design with a 6.45-inch clutch diameter, 3.25-inch fan bolt circle, 2.46-inch mount diameter, and 1.63-inch distance from clutch to mounting flange. It is a reverse-rotation unit with a flange mount and is intended for heavy-duty cooling demands in Chevrolet and GMC trucks, vans, and utility vehicles.

This part cross-references Hayden 2785 and Gates 22154 for the same application. Common vehicle coverage includes Chevrolet P30, Chevrolet Express 2500, Chevrolet Express 3500, GMC P3500, and GMC Savana 2500/Savana 3500 applications where reverse-rotation severe-duty fan clutch service is required.

What It Helps Address

• Engine overheating caused by a worn or weak fan clutch
• Reduced fan engagement in severe-duty cooling systems
• Cooling performance loss in reverse-rotation applications
• Noise or inconsistent operation from a failing thermal clutch
• Replacement needs on Chevrolet and GMC truck and van cooling systems

Installation Notes and Tips

Verify reverse rotation, flange mounting, 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 around the fan, shroud, and water pump area, and inspect the cooling fan and related components for wear before installing Four Seasons 36987.

Quality Assurance

Four Seasons 36987 is a new, performance-rated fan clutch that meets or exceeds OEM specifications. It is built as a severe-duty thermal replacement for applications that require dependable mechanical fan control in demanding service.