Part Type: Engine Cooling Fan Clutch. Reverse Rotation Severe Duty Thermal Fan Clutch. Fan Clutch. Electronic Clutch?. : Non Electronic. Thermal Or Centrifugal: D - Severe Duty & Truck Fan Drive. 2001 Chevrolet Silverado 2500 HD Engine: 6.0L V8; Counter Clockwise; Optional Duty Thermal Fan Clutch;.