The auxiliary heating/air conditioning regulates the temperature in the Audi A3 interior when the high-voltage battery is sufficiently charged and there is enough fuel in the tank.
The 
symbol flashes in the air conditioner control console when the auxiliary heating is on.
symbol flashes in the air conditioner control console when the auxiliary heating is on.If one of the auxiliary heating/air conditioning timers is programmed, the symbol remains permanently lit until the departure time is reached.
symbol remains permanently lit until the departure time is reached.WARNING!
- The auxiliary heating/air conditioning must not be allowed to run when the Audi A3 is in a confined space – risk of poisoning!
- Never have the auxiliary heating/air conditioning switched on when refuelling the Audi A3 – risk of fire!
- Because of the high temperatures which occur when the auxiliary heating/air conditioning is running, make sure when parking the car that the exhaust outlet under the car is not obstructed in any way and that the exhaust gases do not come into contact with flammable materials.
Note
At low outside temperatures some visible water vapour may form in the engine compartment. This is a normal phenomenon, and no reason for concern.