1990 Buick Regal Body: Coupe; Engine: 3.8L V6; Radiator Fan Motor; Position: Right;. 1990 Buick Regal Body: Sedan; Engine: 3.8L V6; Radiator Fan Motor; Position: Right;. 1991 Buick Regal Body: Coupe; Engine: 3.8L V6; Radiator Fan Motor; Position: Right;.