Four Seasons 46145 Engine Cooling Fan Clutch

Four Seasons 46145 Severe Duty Thermal Fan Clutch

The Four Seasons Fan Clutch 46145 is a severe duty thermal engine cooling fan clutch built for demanding cooling-system applications. It is used on select Chevrolet Express, Silverado, GMC Savana, and Sierra models where thermal fan control is required for consistent engine temperature management.

Key Features

• Thermal fan clutch design for temperature-responsive fan engagement
• Severe duty style for heavier cooling demands
• Overall diameter: 7.23 in. / 184.15 mm
• Overall height: 4.81 in. / 121.4 mm
• Fan bolt circle: 3.25 in.
• Four-bolt fan mounting pattern with one bolt hole and one mounting hole
• Cross-reference part numbers include Anchor 2984 and interchange 1540608

Product Details

Four Seasons 46145 is part of the Fan Clutch line and is engineered as a thermal severe duty replacement for vehicles that rely on controlled fan engagement to manage engine heat. This fan clutch is listed for 2021-2024 Chevrolet Express 2500 and Express 3500, 2024 Chevrolet LCF 3500HG, 2022-2024 Chevrolet Silverado 2500 HD and Silverado 3500 HD, 2021-2024 GMC Savana 2500 and Savana 3500, and 2022-2024 GMC Sierra 2500 HD and Sierra 3500 HD. It also covers 2020-2021 Chevrolet Silverado 2500 HD and Silverado 3500 HD, plus 2020-2021 GMC Sierra 2500 HD and Sierra 3500 HD with the high performance reverse rotation engine cooling fan clutch application noted in fitment.

This part number, 46145, is a direct-fit cooling system service part for vehicles that need thermal fan clutch operation rather than a fixed mechanical fan setup. The severe duty construction supports applications where the cooling fan must respond to engine temperature changes under load, towing, or stop-and-go driving.

What It Helps Address

• Engine overheating caused by a worn or weak fan clutch
• Delayed fan engagement during rising coolant temperatures
• Excessive fan noise from a clutch that no longer regulates properly
• Cooling performance loss in severe duty driving conditions
• Temperature control issues on Chevrolet Silverado, GMC Sierra, and Express/Savana platforms

Installation Notes

Verify the fan bolt circle, overall diameter, and overall height before installation to confirm proper fitment. Match the vehicle application exactly, especially on 2020-2021 reverse rotation Silverado 2500 HD, Silverado 3500 HD, Sierra 2500 HD, and Sierra 3500 HD models. Inspect the fan, shroud, and surrounding cooling components for wear before installing the new fan clutch. For best results, confirm the replacement against the original part number 46145 and the vehicle’s cooling-system configuration.

Quality Assurance

Four Seasons supplies cooling-system components for OE-style service replacement, and this Fan Clutch line is built to meet the dimensional and application requirements listed for the vehicle fitment above. Cross-reference part numbers include Anchor 2984 and interchange 1540608 for the same application.