Audi a3 air conditioner internal circulation button, how Audi a3 opens the internal circulation diagram.

The cycle button on the Audi A3 car is located on the center console on the right side of the air thermostat. This icon is a rotating arrow on a car, which is marked as "in-car circulation" in the figure below. The place is the internal circulation system of Audi A3. Audi A3 can turn on the in-vehicle circulation system as long as you press the in-vehicle circulation button. Audi A3 empty key adjustment details: A/C switch is the so-called air conditioning switch, which essentially controls whether the compressor works or not. The compressor is equipped with an electromagnetically controlled clutch. When the coil is energized, the electromagnetic clutch is engaged and the compressor works; Otherwise, the pulley of the compressor just idles and the compressor does not work. When you press the idle switch, you will hear a bang, which is the sound of the electromagnetic clutch of the compressor engaging. Air internal and external circulation mode: control whether the source of air drawn by the blower is the air inside the car or the air outside the car; Generally, the internal circulation mode is adopted during refrigeration, that is, the blower draws air from the car; Temperature adjustment of air body: air body is cooled by evaporator of refrigeration system and heated by warm air water tank, and the air flow rate through warm air water tank is controlled to realize temperature and humidity adjustment of air body in the car; Adjustment of air outlet mode: adjust which part of the air outlet is: the air outlet is upward, the air outlet is facing the panel, the air outlet is facing the foot, or both parts are simultaneously air outlet, etc.