1987 Jeep Comanche Engine: 4.0L L6; Reverse Rotation; Standard Duty Thermal Fan Clutch;. 1988 Jeep Comanche Engine: 4.0L L6; Reverse Rotation; Standard Duty Thermal Fan Clutch;. 1989 Jeep Comanche Engine: 4.0L L6; Reverse Rotation; Standard Duty Thermal Fan Clutch;.