Recirculation Switch

The Recirculation Switch is a momentary contact switch. Toggling the switch on results in the A/C-Heater Control Module signaling the actuator to close the fresh-air door. Toggling the switch off results in the A/C-Heater Control Module signaling the actuator to open the fresh-air door. The switch status indicator illuminates when the switch is on. When the Power Switch is off, the A/C-Heater Control Module closes the fresh-air door to prevent outside air from entering the passenger compartment. The recirculation mode will cancel whenever defrost is requested. Pressing the Recirculation Switch while in defrost mode will illuminate the Recirculation Switch status indicator, but only while the button is pressed. Under this circumstance, the recirculation request will be denied and the fresh-air door will remain in the fresh position. All door positions are determined relative to the number of commutator pulses required to provide full travel of the door. On command, the A/C-Heater Control Module runs the actuator for the number of pulses corresponding to the desired door position.