Part Type: Engine Cooling Fan Clutch. Standard Rotation Thermal Standard Duty Fan Clutch. Fan Clutch. 1979 GMC G3500 Engine: 4.1L L6; Standard Rotation; Standard Duty Thermal Fan Clutch; w/ AC;. 1979 GMC G3500 Engine: 5.7L V8; Standard Rotation; Standard Duty Thermal Fan Clutch; w/o AC;.
