Four Seasons 46146 Engine Cooling Fan Clutch

Engine Cooling Fan Clutch for Heavy-Duty GM Trucks

Four Seasons 46146 is an electronic engine cooling fan clutch built for severe-duty cooling control. It is engineered with an aluminum housing, reverse rotation, and electro-viscous operation to support consistent fan engagement in demanding truck applications.

Compatible with select Chevrolet Silverado 2500 HD and Silverado 3500 HD models, as well as GMC Sierra 2500 HD and Sierra 3500 HD applications, this Four Seasons fan clutch is built for direct-fit cooling system service. The Four Seasons Fan Clutch line focuses on dependable replacement parts for vehicles that need stable engine temperature control under load.

Key Features

• Part number 46146 engine cooling fan clutch
• Electronic, electro-viscous grade type
• Severe-duty style for demanding cooling system use
• Aluminum construction with raw aluminum finish
• Reverse rotation design
• 4-bolt hole and 4 mounting hole configuration
• HEX mounting type with M6x1.000 bolt thread
• Overall diameter: 9.39 in. (238.5 mm)
• Overall height: 5.33 in. (135.38 mm)
• Fan bolt circle: 8.66 in.

Product Details

Four Seasons 46146 is an electronic fan clutch designed for cooling systems that require controlled fan engagement rather than a purely mechanical response. Its electro-viscous, electronic operation supports precise airflow management, while the aluminum body helps keep the assembly lightweight and durable. This part cross-references Anchor 3204 for the same application.

Fits 2017-2020 Chevrolet Silverado 2500 HD, N/A. Fits 2017-2019 Chevrolet Silverado 3500 HD, N/A. Fits 2017-2019 GMC Sierra 2500 HD, N/A. Fits 2017-2019 GMC Sierra 3500 HD, N/A. If you are replacing a worn fan clutch on a Chevrolet Silverado 2500 HD, GMC Sierra 3500 HD, or similar heavy-duty GM truck, verify the electronic connector style and mounting dimensions against the original unit before installation.

Common Cooling System Issues

• Engine fan not engaging at the correct time
• Excessive fan noise from a worn clutch
• Overheating under towing or heavy-load conditions
• Inconsistent engine temperature control
• Cooling performance loss from clutch wear or electronic failure

Installation Notes

Confirm reverse rotation, bolt pattern, fan bolt circle, and overall diameter before installation. Inspect the fan blades, pulley area, and surrounding cooling components for wear or damage during replacement. For Chevrolet Silverado 2500 HD, Silverado 3500 HD, GMC Sierra 2500 HD, and GMC Sierra 3500 HD applications, match the original electronic fan clutch configuration to ensure proper fitment and operation.

Quality Assurance

Four Seasons states that its products are engineered and tested for long service life and trouble-free operation. Backed by more than 50 years of mobile A/C experience, the brand positions this fan clutch line as a reliable replacement for cooling system repair.