Automatic recirculated air control
The system assumes AUC mode by pressing the AUC/recirculated air button several times. As a result, the left and right fresh air/recirculated air flaps are closed dependent on the air quality . AUC mode is indicated by an LED in the AUC/recirculated air button .
The air quality is sensed by the AUC sensor in the engine compartment. . This sensor is heated for 90 seconds after starting the vehicle . In order to avoid fogging of the windows on the inside of the vehicle , the fresh air and recirculated air flaps are forced open for a limited time during prolonged recirculated air mode . This time limit is 3 minutes in heating mode and 12 minutes in air conditioning mode . After these times have elapsed, the air supply is switched back automatically to outside air for 1 minute . AUC operation is reactivated after this 1 minute period.