Four Seasons 46039 Engine Cooling Fan Clutch

Four Seasons 46039 Severe Duty Fan Clutch

The Four Seasons 46039 is a thermal engine cooling fan clutch built for severe-duty and truck fan drive applications. It uses an aluminum construction, standard rotation, and a non-electronic design to support cooling fan engagement in demanding service conditions.

Compatible With Chevrolet P20, Chevrolet P30, GMC P2500, and GMC P3500 applications, this fan clutch is a direct-fit option for select 1985-1989 vehicles that use a 6-bolt flange mount and a 6-inch fan bolt circle. The Four Seasons Fan Clutch line focuses on replacement parts that meet or exceed OEM requirements for fit and function.

Key Features

• Part number 46039 thermal fan clutch for severe-duty cooling systems
• Aluminum housing with raw aluminum finish
• Standard rotation, non-electronic design
• 6-bolt flange mounting with 5/16-18 hole thread
• 7.4-inch maximum clutch diameter and 3.83-inch overall height
• Meets or exceeds OEM specifications
• Performance rated for demanding truck applications

Product Details

This engine cooling fan clutch is engineered for select Chevrolet P20 and P30, plus GMC P2500 and P3500 models that require a thermal, severe-duty fan drive. The 7.4-inch clutch diameter, 82 mm mount diameter, 1.5-inch clutch-to-flange distance, and 0.75-inch pilot diameter help define the mounting geometry for proper replacement selection. If you are sourcing a Four Seasons 46039 replacement for a truck cooling repair, verify the mounting style and rotation before installation.

This part cross-references Dorman - HELP 46039 for the same application.

Common Cooling System Issues

• Engine cooling fan not engaging at the correct temperature
• Excessive fan noise from a worn thermal clutch
• Overheating during stop-and-go or heavy-load driving
• Reduced airflow through the radiator at low vehicle speed
• Cooling performance loss in severe-duty truck service

Installation Notes

Confirm standard rotation, flange mounting, bolt circle, and pilot dimensions against the original part before installation. Mounting hardware is not included, so reuse or source the correct hardware separately as needed. Inspect the fan blades, water pump, and surrounding cooling components during replacement to avoid repeat cooling-system issues.

Quality Assurance

The Four Seasons 46039 is a new, performance-rated fan clutch that meets or exceeds OEM requirements. It is built as a severe-duty thermal replacement for select Chevrolet and GMC truck applications, including 1985-1989 Chevrolet P20 and P30 and 1985-1989 GMC P3500 fitments.