Hayden 2821 Engine Cooling Fan Clutch

Hayden 2821 Severe Duty Fan Clutch

The Hayden 2821 is a thermal engine cooling fan clutch built for severe-duty use in reverse-rotation applications. It is a non-electronic, aluminum unit that meets or exceeds OEM requirements and is performance rated for demanding cooling-system service.

Compatible with 2003 Dodge Ram 2500 and 2003 Dodge Ram 3500, this Hayden Fan Clutch is built around a 7.4-inch maximum diameter, 4-bolt mounting pattern, and hex mounting type for a direct-fit cooling system repair.

Key Features

• Brand: Hayden Fan Clutch
• Part number: 2821
• Severe-duty thermal design for truck fan drive applications
• Reverse rotation (REV) configuration
• Non-electronic clutch construction
• Aluminum housing with raw aluminum finish
• 4-bolt / 4-mounting-hole design
• Meets or exceeds OEM specifications
• Performance rated for severe service

Product Details

The Hayden 2821 fan clutch is engineered for engine cooling systems that require controlled fan engagement under heavy load and higher thermal demand. Its thermal operation helps regulate fan speed based on temperature, while the severe-duty truck fan drive style supports consistent cooling performance in reverse-rotation setups. The 7.4-inch clutch diameter, 3.25-inch fan bolt circle, 1.44-inch mount diameter, and 1.18-inch pilot diameter provide the dimensional details needed for accurate replacement selection. This part cross-references Dorman HELP 46032 and Gates 22159 for the same application.

Common Cooling System Issues It Can Address

• Engine running hotter than normal under load
• Fan clutch engagement problems in reverse-rotation systems
• Reduced airflow through the radiator at idle or low speed
• Cooling performance loss in severe-duty truck use
• Noisy or inconsistent fan clutch operation

Installation Notes and Tips

Verify reverse-rotation fan clutch requirements before installation. Confirm the mounting flange, pilot dimensions, bolt circle, and thread specification match the existing setup on your 2003 Dodge Ram 2500 or 2003 Dodge Ram 3500. Mounting hardware is not included, so reuse or source the correct hardware separately as needed. Inspect the fan, water pump area, and surrounding cooling components during replacement to help ensure proper operation.

Quality Assurance

Hayden designs this fan clutch to meet or exceed OEM specifications and performance expectations for severe-duty cooling applications. The aluminum construction and thermal, non-electronic design support dependable service in truck cooling systems.