The air intake control button is used to select either Fresh mode (outside air) or Recirculation mode (cabin air).
Recirculation mode

When Recirculation mode is selected, air from the passenger compartment will be recirculated through the system and heated or cooled according to the function selected.
Fresh mode

When Fresh mode is selected, air enters the vehicle from outside and is heated or cooled according to the function selected.
Information
Operating the system primarily in Fresh mode is recommended. Use Recirculation mode temporarily only when needed.
Prolonged operation of the heater in Recirculation mode and without the A/C ON can cause fogging of the windshield.
In addition, prolonged use of the A/C ON in Recirculation mode may result in excessively dry, dehumidified air in the cabin and may promote formation of musty vent odor due to stagnant air.
WARNING
Instrument panel vents The instrument panel vent air flow can be directed up/down or left/right using the vent adjustment lever. The outlet vents can be opened or closed separately using the vent control lever.
The fan speed can be set as desired by pushing the fan speed control button. More air is delivered with higher fan speeds. Pressing the OFF button turns off the fan.
Repair procedures Inspection 1. Turn the ignition switch ON. 2. Manually operate the control switch and measure the voltage of the blower motor. 3. Select the control switch to raise the voltage until high speed.
Schematic diagrams Schematic Diagrams Repair procedures Removal 1. Remove the bumper cover. (Refer to Body - "Front Bumper Cover") (Refer to Body - "Rear Bumper Cover") 2.