1988 HEATER MODULE VIN PRODUCTION DIV CODE USAGE COL NO 03055105 1 I3 W HTR C41 EEXC HTR 046 1 03058397 1 B W HTF1 C41 C4l6 A 2 03055104 1 3 G W HTR C41 1 4 3 1991 GENERAL MOTORS SERVICE PARTS OPERATIONS CHEVROLET 17W 6 91 8 37 8 845