Four Seasons 36781 Engine Cooling Fan Clutch

Heavy Duty Thermal Fan Clutch for Cooling Control

Four Seasons 36781 is a heavy duty thermal engine cooling fan clutch built for reverse rotation applications. It is a non-electronic, aluminum unit with a 7.2-inch clutch diameter and a heavy-duty C-style design for vehicles that need consistent fan engagement under load.

Compatible With Jeep Liberty, Jeep Grand Cherokee, Dodge Nitro, Dodge Durango, and Ram truck applications that call for reverse rotation cooling fan clutch service, this part number 36781 is a direct-fit replacement for the listed vehicles and configurations.

Key Features

• Thermal fan clutch design for temperature-based fan engagement
• Heavy duty C-type construction for demanding cooling systems
• Reverse rotation (REV) application
• Aluminum housing with raw aluminum finish
• Non-electronic design
• 4-bolt / 4-mount-hole configuration with HEX mounting type
• Meets or exceeds OEM requirements
• Performance rated for service use

Product Details

Four Seasons Fan Clutch 36781 is engineered for engine cooling systems that rely on a thermal clutch to regulate fan speed based on operating temperature. The 7.2-inch overall diameter, 1.44-inch mount diameter, 1.25-inch clutch-to-mounting-flange distance, and 3.25-inch fan bolt circle support proper fitment in the specified reverse-rotation applications. This part cross-references Gates 22151 for the same application.

Use this heavy duty fan clutch on 2000-2008 Jeep Liberty, 1999-2004 Jeep Grand Cherokee, 2007 Dodge Nitro, 2002-2003 Dodge Durango, and select 2000-2002 Dodge Ram 1500, Ram 2500, Ram 3500, and Ramcharger applications listed below.

Vehicle Fitment

• Fits 2006-2008 Jeep Liberty, N/A — Reverse Rotation; Heavy Duty Thermal Fan Clutch; Fan Clutch
• Fits 2002-2003 Jeep Liberty, N/A — Reverse Rotation; Heavy Duty Thermal Fan Clutch; Fan Clutch
• Fits 2007 Dodge Nitro, N/A — Reverse Rotation; Heavy Duty Thermal Fan Clutch; Fan Clutch
• Fits 2005 Jeep Liberty, N/A — Reverse Rotation; Heavy Duty Thermal Fan Clutch; w/ Towing Package; Fan Clutch
• Fits 1999-2004 Jeep Grand Cherokee, N/A — Reverse Rotation; Heavy Duty Thermal Fan Clutch; Fan Clutch
• Fits 2004 Jeep Liberty, N/A — Reverse Rotation; Heavy Duty Thermal Fan Clutch; w/ Tow Package; Fan Clutch
• Fits 2003 Dodge Durango, N/A — Reverse Rotation; Heavy Duty Thermal Fan Clutch; w/ 3.92 Rear Axle Ratio; Fan Clutch
• Fits 2002 Dodge Durango, N/A — Reverse Rotation; Heavy Duty Thermal Fan Clutch; Fan Clutch
• Fits 2001-2002 Dodge Ram 1500, N/A — Reverse Rotation; Heavy Duty Thermal Fan Clutch; w/ Max Cooling; Fan Clutch
• Fits 2001-2002 Dodge Ram 2500, N/A — Reverse Rotation; Heavy Duty Thermal Fan Clutch; w/ Max Cooling; Fan Clutch
• Fits 2001-2002 Dodge Ram 3500, N/A — Reverse Rotation; Heavy Duty Thermal Fan Clutch; w/ Max Cooling; Fan Clutch
• Fits 2001 Dodge Ramcharger, N/A — Reverse Rotation; Heavy Duty Thermal Fan Clutch; w/ Max Cooling; Fan Clutch
• Fits 2000 Dodge Ram 1500, N/A — Reverse Rotation; Heavy Duty Thermal Fan Clutch; From 5/1/00; w/ Max Cooling; Fan Clutch
• Fits 2000 Dodge Ram 2500, N/A — Reverse Rotation; Heavy Duty Thermal Fan Clutch; From 5/1/00; w/ Max Cooling; Fan Clutch
• Fits 2000 Dodge Ram 3500, N/A — Reverse Rotation; Heavy Duty Thermal Fan Clutch; From 5/1/00; w/ Max Cooling; Fan Clutch
• Fits 2000 Dodge Ramcharger, N/A — Reverse Rotation; Heavy Duty Thermal Fan Clutch; From 5/1/00; w/ Max Cooling; Fan Clutch

Common Cooling Issues It Can Address

• Engine fan not engaging at the correct temperature
• Excessive cooling fan noise from a worn clutch
• Overheating during towing or heavy-duty operation
• Reduced cooling performance in stop-and-go driving
• Cooling system strain on reverse-rotation fan setups

Installation Notes and Tips

Verify reverse rotation, bolt pattern, pilot dimensions, and fan bolt circle before installation. This unit uses a 4-bolt mounting pattern with 5/16-18 hole threads and does not include mounting hardware. Confirm the vehicle’s cooling package, towing package, axle ratio, and build date where noted in the fitment list before ordering.

Quality Assurance

Four Seasons 36781 is a new, performance-rated thermal fan clutch that meets or exceeds OEM requirements for the listed applications. The aluminum construction and heavy-duty design support dependable cooling-system service in the specified Jeep and Dodge vehicles.