Controlling air intake
This is used to select the outside (fresh) air position or recirculated air position.

To change the air intake control position:
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Push the control button.
Outside (fresh) air position

Recirculated air position

Prolonged operation of the heater in the recirculated air position (without air conditioning selected) may cause fogging of the windshield and side windows and the air within the passenger compartment may become stale.
In addition, prolonged use of the air conditioning with the recirculated air position selected will result in excessively dry air in the passenger compartment.