Audi A4 Owners & Service Manuals

Audi A4: Climate control system


Your vehicle has a deluxe automatic climate control system with three zones in which the temperature, air distribution, and air supply can be adjusted separately for the front left and right sides, as well as the temperature in the rear.

The climate control system warms, cools, dehumidifies, and filters the air in the vehicle interior.

It is the most effective when the windows and panoramic glass roof* are closed. If there is a build-up of heat inside the vehicle, ventilation can help to speed up the cooling process.

The automatic climate control system automatically maintains a temperature once it has been set. In all heating mode functions except defrost, the blower only switches to a higher speed once the coolant has reached a certain temperature.

Active combination filter

When the fan is running, the filter will reduce particulate matter and the concentration of pollen, as well as odors in the interior.


  • You should not use the recirculation mode for an extended period of time, because no fresh air is drawn in. This can cause the windows to fog, which increases the risk of an accident. The CO2 concentration in the vehicle interior can also increase when recirculation mode is used for long periods of time, which can impair concentration and affect well-being. Switch recirculation mode off and ventilate the vehicle at the first sign of unwellness.
  • Applies to: vehicles with seat heating: Individuals with reduced sensitivity to pain or temperature could develop burns when using the seat heating function. To reduce the risk of injury, these individuals should not use seat heating.


Applies to: vehicles with heated seats

To reduce the risk of damage to the seat heating elements, do not kneel on the seats or place heavy pressure on one area of the seat.

For the sake of the environment

Energy can be saved by switching off the A/C mode.


  • To prevent interference with the heating or cooling output and to prevent the windows from fogging over, the air intake in front of the windshield must be free of ice, snow, and leaves.
  • Condensation from the cooling system can drip and form a puddle of water under the vehicle. This is normal and does not mean there is a leak.
  • The energy management system may temporarily switch off certain functions, such as the seat heating" or rear window defogger.

    These systems are available again as soon as the energy supply has been restored.

  • Applies to: vehicles with heated seats: If the front passenger's seat heating has been turned on, it will not turn on again automatically if more than 10 minutes have passed between switching the ignition off and on again.


     Operating in the cockpit

    Fig. 92 3-zone deluxe automatic climate control system: controls Press the knobs, buttons or rocker switches to turn the functions on or off. When the function is switched on, the LED in the respecti

     Fluids in the A/C system

    Refrigerant in the A/C system The sticker in the motor compartment provides information about the type and amount of refrigerant used in the vehicle's A/C system. The sticker is located in the front s



     Luggage compartment lid

    General information WARNING Applies to: vehicles with anti-theft alarm system: When the vehicle is locked from the outside, no one, especially children, should remain in the vehicle, because the windows can no longer open from the inside. Locked doors make it more difficult for emergency work

     Central locking

    General information WARNING If you leave the vehicle, switch the ignition off and take the key with you. This applies particularly when children remain in the vehicle. Otherwise, children could start the vehicle or operate electrical equipment (such as power windows), which increases the risk

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