Four Seasons 36955 Engine Cooling Fan Clutch

Four Seasons 36955 Severe Duty Fan Clutch

Four Seasons 36955 is a thermal engine cooling fan clutch built for severe-duty use and reverse rotation applications. It is a new, non-electronic aluminum fan clutch that meets or exceeds OEM requirements and is performance rated for demanding cooling systems.

• Severe duty thermal fan clutch for truck and heavy-duty cooling applications
• Reverse rotation (REV) design for specific GM belt-driven cooling setups
• Aluminum construction with raw aluminum finish
• Flange mounting type with 4 bolt holes and 4 mounting holes
• 6.45 in. clutch maximum diameter and 3.66 in. overall height
• Thermal, non-electronic operation for mechanical fan control
• Meets or exceeds OEM specifications

Product Line Details

As part of Four Seasons’ Fan Clutch line, this severe-duty unit is aimed at vehicles that need consistent fan engagement under load, especially trucks, vans, and utility platforms. Part number 36955 is built for reverse-rotation cooling systems and is listed for a wide range of Chevrolet and GMC applications from 1987 through 2000.

This part cross-references Gates 22140 and 22145 for the same application.

Fitment Coverage

• Fits 1992-2000 Chevrolet C2500, N/A.
• Fits 1992-2000 Chevrolet C3500, N/A.
• Fits 1996-2000 Chevrolet Express 3500, N/A.
• Fits 1992-2000 Chevrolet K2500, N/A.
• Fits 1992-2000 Chevrolet K3500, N/A.
• Fits 1996-2000 GMC Savana 3500, N/A.
• Fits 1992-2000 GMC C2500, N/A.
• Fits 1992-2000 GMC C3500, N/A.
• Fits 1992-2000 GMC K2500, N/A.
• Fits 1992-2000 GMC K3500, N/A.
• Fits 1987-1995 Chevrolet Astro, N/A.
• Fits 1987-1995 GMC Safari, N/A.
• Fits 1988-1996 Chevrolet G30, N/A.
• Fits 1988-1996 GMC G3500, N/A.
• Fits 1988-1995 Chevrolet S10, N/A.
• Fits 1991-1995 GMC Sonoma, N/A.
• Fits 1992-1995 GMC Jimmy, N/A.
• Fits 1992-1995 GMC Yukon, N/A.
• Fits 1995 Chevrolet Blazer, N/A.
• Fits 1995 Chevrolet Tahoe, N/A.
• Fits 1995 Chevrolet Silverado, N/A.

What It Helps Fix

• Engine overheating during towing, hauling, or stop-and-go driving
• Weak fan engagement on reverse-rotation cooling systems
• Cooling performance loss in severe-duty truck and van use
• Fan clutch noise or inconsistent thermal response
• Fitment issues when replacing an OEM-style mechanical fan clutch

Installation Notes

Verify reverse rotation, flange mounting, bolt pattern, and fan bolt circle before installation. This Four Seasons fan clutch uses M10 x 1.5 hole threading, a 3.25 in. fan bolt circle, and a 2.46 in. mount diameter. Mounting hardware is not included, so reuse or source the correct hardware as needed. Confirm clearance with the 6.45 in. clutch diameter and 3.66 in. overall height before final assembly.

Quality Assurance

Four Seasons 36955 is a new, performance-rated thermal fan clutch that meets or exceeds OEM specifications for severe-duty cooling service. Its aluminum construction and mechanical thermal design support dependable operation in the listed Chevrolet and GMC applications, including Chevrolet C2500, Chevrolet K3500, and GMC Safari platforms.