the first series 40(special) defroster air valve is operated by a knob marked "DEFROST" located below center of instrument panel: the defrost blower is controlled by a switch marked "BLOWER" mounted on the radio speaker grill. On later series 40 the defroster air valve control and blower switch are combined in one unit mounted on the radio speaker grill. Pulling out the knob marked "DEFROST" opens the air valve. Turning the knob clockwise turns on the defrost blower.
Bookmarks