Mode Rotary Knob

The mode rotary knob operates the defrost control cable that moves to the left end of the heater module. This cable operates a crank lever and the shaft that controls the position of the an air valve in the heater module. The detents at 0 degrees, 90 degrees, and 180 degrees indicate the VENT position, the FLOOR position, and the DEFROST position. By placing the rotary control anywhere in between the two desired modes, the operator can blend the air delivery.