Four Seasons 46001 Engine Cooling Fan Clutch

Engine Cooling Fan Clutch for BMW Applications

Four Seasons Fan Clutch 46001 is a standard-duty thermal engine cooling fan clutch built with an aluminum body and a non-electronic design. It is made for BMW cooling systems that require a standard rotation import-style fan clutch with a 5" and 6" application profile.

Compatible With BMW 540i, 740i, 740iL, 750iL, 840Ci, 850Ci, 530i, 850CSi, and 850i applications across the listed model years, this part is a direct-fit cooling service component for vehicles using the specified mounting and pilot dimensions. Four Seasons 46001 is also cross-referenced with Dorman - HELP 46001 for the same application.

Key Features

• Thermal, non-electronic fan clutch for engine cooling control
• Standard rotation design
• Aluminum construction with raw aluminum finish
• Standard-duty, performance-rated replacement
• Meets or exceeds OEM requirements
• 3-bolt mounting pattern with HEX mounting type
• Fan bolt circle: 5.79 in. / 147.1 mm
• Mount diameter: 1.25 in. / 32 mm

Detailed Product Overview

Four Seasons Fan Clutch 46001 is engineered for BMW cooling fan clutch service where thermal engagement is required to regulate airflow through the radiator and engine bay. The clutch uses a standard rotation layout, a 6.3 in. maximum diameter, and a 2.08 in. overall height to match the specified import-style fitment. Its aluminum construction and OEM-level dimensional profile support proper fan operation in applications such as BMW 540i, BMW 740i, and BMW 750iL cooling systems.

This part number, 46001, is intended for vehicles that use a 3-bolt fan clutch interface, M6 x 1.0 hole thread, 0.94 in. pilot diameter, and 0.51 in. pilot depth. It is a practical replacement for drivers searching for a BMW 740i fan clutch, BMW 540i engine cooling fan clutch, or BMW 850Ci thermal fan clutch replacement.

Common Cooling Issues It Can Address

• Fan clutch that no longer engages at the correct temperature
• Reduced radiator airflow at idle or low road speed
• Cooling fan noise caused by worn clutch internals
• Overheating concerns tied to weak mechanical fan operation
• Inconsistent engine cooling performance in stop-and-go driving

Installation Notes and Tips

Verify the fan bolt circle, pilot diameter, mounting depth, and rotation before installation. This clutch uses a HEX mounting type and does not include mounting hardware. Confirm that the vehicle uses the listed standard rotation thermal fan clutch configuration and that the fan and pulley setup match the 5" and 6" import-style application profile.

For fitment-focused searches, this part is commonly referenced as a BMW 540i fan clutch replacement, BMW 740iL cooling fan clutch, or BMW 850i thermal fan clutch. The Four Seasons 46001 part number should be matched to the vehicle’s original clutch dimensions and mounting style before service.

Quality Assurance

Four Seasons lists this fan clutch as new, performance rated, and built to meet or exceed OEM specifications. The design follows standard-duty cooling system requirements for the listed BMW applications and uses a thermal, non-electronic operating style.