Four Seasons 46021 Engine Cooling Fan Clutch

Four Seasons 46021 Severe Duty Fan Clutch

The Four Seasons 46021 is a thermal engine cooling fan clutch built for severe-duty truck cooling demands. It uses a reverse-rotation design and aluminum construction to support consistent fan engagement in demanding operating conditions.

Compatible with select Dodge Ram 1500, Ram 2500, and Ram 3500 applications, this Four Seasons Fan Clutch line part is engineered to meet or exceed OEM requirements. The 46021 is a direct-fit style replacement for severe duty thermal fan clutch service on reverse-rotation cooling systems.

Key Features

• Thermal, non-electronic fan clutch for engine cooling control
• Severe duty and truck fan drive style
• Reverse rotation (REV) configuration
• Aluminum housing with raw aluminum finish
• 4-bolt mounting pattern with hex mounting type
• Fan bolt circle: 3.25 in. / 82.6 mm
• Mount diameter: 1.44 in. / 36 mm
• Overall height: 4.63 in. / 117.3 mm
• Meets or exceeds OEM specifications
• Performance rated for severe-duty use

Product Details

Four Seasons 46021 is a severe-duty thermal fan clutch designed for reverse-rotation cooling systems that require controlled airflow through the radiator and engine bay. With a 6.45 in. clutch diameter and a 2.59-2.6 in. distance from clutch to mounting flange, it is built around the dimensions needed for select Dodge Ram cooling assemblies. This part cross-references Dorman - HELP 46021 and Gates 22168 for the same application.

Fits 2005-2008 Dodge Ram 1500, N/A; Fits 2005-2008 Dodge Ram 2500, N/A; Fits 2005-2008 Dodge Ram 3500, N/A; Fits 2003-2004 Dodge Ram 1500, N/A; Fits 2003-2004 Dodge Ram 2500, N/A; Fits 2003-2004 Dodge Ram 3500, N/A. Use this Four Seasons 46021 fan clutch when servicing reverse-rotation, severe-duty thermal cooling systems on Dodge Ram trucks with the listed cooling package notes.

Common Cooling Issues It Can Address

• Engine temperatures that rise under load or in stop-and-go driving
• Reduced fan engagement in a reverse-rotation cooling system
• Cooling performance loss on severe-duty truck applications
• Noise or inconsistency from a worn thermal fan clutch
• Poor airflow through the radiator during towing or heavy use

Installation Notes

• Verify reverse-rotation fan clutch requirements before installation.
• Confirm the 4-bolt, hex-mount pattern and pilot dimensions match the existing assembly.
• Mounting hardware is not included.
• Inspect the fan, water pump area, and surrounding cooling components before replacement.
• Follow vehicle-specific service procedures for Dodge Ram cooling system service.

Quality Assurance

Four Seasons 46021 is a new, performance-rated fan clutch that meets or exceeds OEM specifications. It is built as a severe-duty thermal replacement for select Dodge Ram cooling applications and is intended for direct-fit service where the listed fitment matches the vehicle.