Four Seasons 36973 Engine Cooling Fan Clutch

Four Seasons 36973 Fan Clutch Overview

Four Seasons 36973 is a severe-duty thermal engine cooling fan clutch built for reverse-rotation applications. It is a non-electronic aluminum unit with a hex mounting type, engineered for demanding cooling needs in Chevrolet Express, GMC Savana, Silverado, Sierra, Tahoe, Yukon, and related GM truck and SUV platforms.

Use this Four Seasons fan clutch when you need a direct replacement for reverse-rotation cooling systems that rely on thermal engagement for airflow control. Part number 36973 is a new, performance-rated fan clutch that meets or exceeds OEM requirements.

Key Features

• Severe-duty thermal fan clutch for truck and SUV cooling systems
• Reverse rotation design for listed GM applications
• Aluminum construction with raw aluminum finish
• Non-electronic design for thermal operation
• 4-bolt / 4-hole mounting pattern with M10 x 1.5 hole thread
• Performance rated and meets or exceeds OEM specifications
• Clutch maximum diameter: 6.45 in. Overall height: 3.77 in.
• Fan bolt circle: 3.25 in. Mount diameter: 1.44 in.

Product Details

The Four Seasons Fan Clutch line is built for cooling-system service where consistent fan engagement matters under load, towing, and stop-and-go driving. This severe-duty thermal design uses temperature-responsive operation rather than electronic control, making it a straightforward replacement for reverse-rotation GM truck and van applications. Part number 36973 is commonly searched for Chevrolet Express 2500 and GMC Savana 3500 fan clutch replacement, as well as Silverado, Sierra, Tahoe, and Yukon cooling repairs.

This part cross-references Gates 22158 and Dorman HELP 46023 for the same application.

Common Problems It Can Help Address

• Engine running hotter than normal at idle or low speed
• Reduced fan engagement during towing or heavy-duty use
• Cooling fan noise caused by a worn clutch
• Inconsistent airflow through the radiator and condenser
• Overheating concerns on reverse-rotation GM cooling systems

Installation Notes and Tips

• Verify reverse-rotation application before installation.
• Confirm bolt pattern, pilot diameter, and overall height against the original unit.
• Inspect the fan blade, water pump area, and surrounding cooling components during replacement.
• Mounting hardware is not included.
• Follow the vehicle service manual for torque and removal procedures.

Quality Assurance

Four Seasons 36973 is a new, performance-rated fan clutch that meets or exceeds OEM requirements for the listed applications. It is designed for severe-duty service in compatible Chevrolet and GMC cooling systems, including many Express, Savana, Silverado, Sierra, Tahoe, and Yukon models.

Compatible fitment examples include Fits 2003-2010 Chevrolet Express 2500, Fits 2003-2013 GMC Savana 3500, and Fits 2006-2010 Chevrolet Silverado 1500, all with reverse-rotation thermal fan clutch applications.