On cold days, the interior of the Audi A3 warms up more quickly with the supplementary electric heater. The supplementary heater is switched on automatically as required, depending on the setting on the Audi A3 heating system.
Applies to Audi A3s with MMI*: The "supplementary heater" function can be switched on/off. Select MENU button > Car > control button Systems* > AC > Auto supplementary heater.