Part Type: Engine Cooling Fan Clutch. Notes: Reverse Rotation; Severe Duty Thermal Fan Clutch;. Fan Clutch. Reverse Rotation Severe Duty Thermal Fan Clutch. Fan Clutch, Thermal. 2007 Chevrolet Silverado 3500 HD Engine: 6.6L V8; Reverse Rotation; Severe Duty Thermal Fan Clutch;.