For 1988-1995 GMC K2500 Engine Cooling Fan Clutch 4 Seasons. 1988 GMC K2500 Engine: 4.3L V6; Reverse Rotation; Optional Standard Duty Thermal Fan Clutch; Fan Mounting Holes are 10 mm.;. 1988 GMC K2500 Engine: 5.0L V8; Reverse Rotation; Optional Standard Duty Thermal Fan Clutch; Fan Mounting Holes are 10 mm.;.
