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. 2006 Chevrolet Silverado 1500 Submodel: SS; Engine: 6.0L V8; Reverse Rotation; Severe Duty Thermal Fan Clutch;.