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Heating and manual air conditioning system: If the air distribution control is set to position when the recirculation modes is switched on, the recirculated-air mode is switched off. By pressing the button, the air recirculation also in this position can be switched on again. When the cooling system is switched on and the temperature regulator is “turned” to the left, the recirculated-air mode is switched on.
Climatronic: The Climatronic can have a sensor that measures the air recirculation mode and automatically turns on if there is an increased concentration of pollutants in the incoming air. When the pollutant concentration decreases to the normal level, the recirculated air mode is automatically switched off. The auxiliary heating heats the vehicle interior as well as the engine.
For heating, fuel is consumed from the fuel tank. The auxiliary ventilation enables fresh air to flow into the vehicle interior with the engine switched off, whereby the interior temperature is effectively decreased (e.g. with the vehicle parked in the sun). The auxiliary heating (auxiliary heating and ventilation) (referred to just as auxiliary heating in the following) ensures the heating / ventilation depending on the setting of the air conditioning and the air outlet vents before switching off the ignition.