Replacement RF31370002 Severe Duty Thermal Engine Cooling Fan Clutch

The Replacement RF31370002 is a Severe Duty Thermal Engine Cooling Fan Clutch engineered as a direct OEM replacement for Ford medium-duty truck applications. Designed to meet or exceed original equipment specifications, this fan clutch ensures proper engine temperature management under demanding operating conditions.

This thermal-type fan clutch uses a silicone fluid and thermostatic spring mechanism to regulate fan speed based on engine temperature. When the engine is cool, the clutch allows the fan to freewheel at reduced speed, minimizing parasitic drag and improving fuel efficiency. As engine temperatures rise, the clutch engages fully to deliver maximum cooling airflow to the radiator.

Key Features:

• Type: Severe Duty Thermal (Viscous)
• Placement: Front-mounted, engine cooling fan
• Material: Aluminum construction
• Mounting: 6-hole mounting configuration
• Rotation: Standard rotation
• Fitment: Direct OEM replacement — no modifications required
• OEM Cross-Reference Numbers: 1C448A616BA, 1C4Z8A616BA
• Additional Cross-References: 2853, 46096, 1C428A616BA

This fan clutch is sold as a single unit and is built to handle the thermal loads of heavy-duty diesel and gas engine applications. Its severe duty rating makes it ideal for vehicles subjected to high-load, high-temperature use such as towing, hauling, or commercial fleet operation.