Mode Control

The mode control determines the air flow to the desired air outlet. The mode control lever is mechanically connected by a cable to the mode door in the heater case. The mode door position determines the air flow to the ventilation, bi-level, heat, heat/defrost, or defrost air outlets. When the heat/defrost or the defrost position is selected, a mechanical linkage on the heater case closes an electrical switch which engages the A/C system.

Air quantity is controlled by the blower switch. Air quantity is also affected by vehicle speed when the fresh/recirculation lever is in the FRESH position. The passenger compartment receives more air as the vehicle speed increases. The passenger compartment receives some air even if the blower switch is in the OFF position.