Where is the air recirculation button located on the Audi A4?

[NaomiDella]

The air recirculation button on the Audi A4 is located on the center console, marked with a circle and an 'A' symbol, which controls the air conditioning's internal and external circulation. Function of internal circulation: The purpose of internal circulation is to prevent dust and odors from being drawn into the car through external circulation. Therefore, a control system is set up to close the external circulation air duct, blocking polluted air from outside the vehicle. Function of external circulation: Since the interior of the car forms a relatively sealed environment, prolonged exposure can lead to oxygen deficiency. To address this, the air conditioning system includes an additional air duct that draws fresh air from outside the car. This air then passes through the air conditioning evaporator or heater core, delivering either cool or warm air accordingly.