. OPERATION DETAILED CONTROLS AND GAUGES is 3 - 41 Vent Selector Switch (Air Flow to Upper Part of Body and Foot) If this switch (1) is pressed directed to the face and f eet. he air Vent Selector Switch (Air Flow to Foot ) If switch (1) is pressed, th e air from the air conditioner is all directed to the feet. This can be used to send warm air to t he feet during cold weather.