The OFF button is used to switch the air conditioner on and off. The air conditioner will also switch on if you press the rotary control. When the air conditioner is switched off, the supply of air from outside the car is cut off.

When the air cooling is switched off, the air is neither cooled nor dehumidified. The windows may mist up as a result. The air cooling is switched off automatically at low outside temperatures (below zero).

In air recirculation mode, the air from the interior of the Audi A4 is filtered and recirculated. This setting prevents fumes etc. from entering the interior. We recommend switching on the air recirculation mode when driving through a tunnel or in traffic queues WARNING!.

The air recirculation mode is switched off when the AUTO or FRONT button is pressed.

The automatic mode maintains a constant temperature inside the Audi A4. Air temperature, output and distribution are regulated automatically.

The temperature can be adjusted between +16 °C (+60 °F) and +28 °C (+84 °F). Outside this range, LO or HI will appear on the air conditioner display. In the two extreme settings the air conditioner operates continuously with maximum cooling or heating output, and the temperature is not regulated automatically.

You can adjust the blower speed manually. Press the AUTO button for automatic control of the blower speed.

You can direct the flow of air manually to selected outlets. Press the AUTO button for automatic air distribution.

When you press the button, the seat heating is switched on at level 3 (the highest level). The LEDs indicate the temperature level. To reduce the temperature, press the button again. To switch off the seat heating, press the button repeatedly until all the LEDs have gone out.

The seat heating automatically switches from level 3 to level 2 after 10 minutes.

When you press the button, the seat ventilation is switched on at level 3 (the highest level). The LEDs indicate the ventilation level. To reduce the ventilation, press the button again. To switch off the seat ventilation, press the button repeatedly until all the LEDs have gone out.

The windscreen and side windows are defrosted or demisted as quickly as possible. The air output is increased to maximum and most of the air comes out of the outlets below the windscreen. The air recirculation mode is deactivated. The temperature should be set to 22 °C or higher. The temperature is regulated automatically.

The defroster is switched off when the AUTO button is pressed.

The rear window heating operates only when the engine is running and switches off automatically after a few minutes, depending on the outside temperature.

To switch on the rear window heating permanently, press and hold the REAR button for at least two seconds. It will then remain on until the ignition is switched off.

The thumbwheels can be used to open and close the air outlets in the centre and on either side of the dashboard. The lever in the centre of the outlets can be used to adjust the direction of air flow.

To increase or reduce the air temperature in the rear cabin on Audi A4s with 3-zone deluxe automatic air conditioner^*, turn the right thumbwheel towards the red or blue marking.