Part Type: Engine Cooling Fan Clutch. Manufacturer: Four Seasons. 1988 GMC G2500 Engine: 5.7L V8; Standard Rotation; Standard Duty Thermal Fan Clutch; Fan Mounting Holes are 5/16 In.; w/o AC;. 1979 GMC G2500 Engine: 4.1L L6; Standard Rotation; Optional Standard Duty Thermal Fan Clutch; w/o AC;.
