Hayden 2851 Engine Cooling Fan Clutch

Hayden 2851 Severe Duty Thermal Fan Clutch

The Hayden 2851 is a severe duty thermal engine cooling fan clutch built for reverse rotation applications. It uses an aluminum construction, non-electronic design, and thermal operation to help maintain proper fan engagement in demanding cooling systems.

Compatible With 2006-2009 Chevrolet Trailblazer, 2006-2006 Chevrolet Trailblazer EXT, 2006-2009 GMC Envoy, 2006-2006 GMC Envoy XL, 2008-2008 Isuzu Ascender, and 2008-2009 Saab 9-7x. This Hayden fan clutch is a direct-fit option for reverse rotation severe duty thermal fan clutch applications on these vehicles.

Key Features

• Brand: Hayden Fan Clutch
• Part number: 2851
• Thermal, non-electronic fan clutch design
• Severe duty and truck fan drive style
• Reverse rotation configuration
• Aluminum construction with raw aluminum finish
• 4-bolt mounting pattern with HEX mounting type
• Meets or exceeds OEM requirements
• Performance rated for demanding cooling system service
• Fan bolt circle: 3.81 in. / 96.8 mm
• Overall diameter: 7.4 in. / 188 mm
• Overall height: 4.27 in. / 108.3 mm

Product Details

The Hayden Fan Clutch line is built for cooling system service where consistent fan control matters. Part number 2851 uses a thermal operating design to respond to temperature changes and engage the fan as needed in severe duty applications. Its reverse rotation setup, aluminum body, and truck-duty construction make it a fitment-specific replacement for vehicles that require this exact configuration. This part cross-references Dorman - HELP 46049 for the same application.

Common Cooling System Issues

• Engine temperature running higher than normal under load
• Fan clutch engagement that is delayed, weak, or inconsistent
• Cooling fan noise caused by a worn clutch assembly
• Reduced airflow through the radiator at idle or low speed
• Cooling performance loss in severe duty driving conditions

Installation Notes

Verify reverse rotation, mounting style, pilot dimensions, and fan bolt circle before installation. This Hayden 2851 uses a 4-bolt pattern, M8 x 1.25 hole thread, 1.44 in. mount diameter, and 1.18 in. pilot diameter. Mounting hardware is not included, so reuse or source the correct hardware as required by the vehicle application. Confirm clearance, clutch depth, and fan alignment during installation.

Quality Assurance

Hayden 2851 is a new, performance-rated thermal fan clutch that meets or exceeds OEM specifications for the listed applications. It is built for severe duty cooling service and direct replacement use on the confirmed vehicle fitments.