Part Type: Engine Cooling Fan Clutch. 1978 Chevrolet C20 Suburban Engine: 4.8L L6; Standard Rotation; Standard Duty Thermal Fan Clutch; w/o A/C;. 1982 Chevrolet C20 Suburban Engine: 4.8L L6; Standard Rotation; Standard Duty Thermal Fan Clutch; w/o A/C;.