BMW 4 Series Owner's Manual page 144

Controls
▷ LED off: outside air flows in continuously.
▷ LED on, recirculated-air mode: the supply
of outside air into the vehicle is perma‐
nently blocked.
If the windows fog over, switch off recircu‐
lated-air mode and increase the air volume, if
necessary.
Continuous recirculated-air mode
The recirculated-air mode should not be
used for an extended period of time, as the air
quality inside the vehicle deteriorates stead‐
ily.◀
Switching the system on/off
Switching off
Press the left button for the minimum
speed.
Automatic climate control with enhanced features
1 Seat heating, left 50
2 Temperature, left
144
Climate control
Online Edition for Part no. 0140 2 909 827 - VI/13
Switching on
Press any button except
▷ Rear window defroster.
▷ Seat heating.
Microfilter
In external and recirculated air mode the mi‐
crofilter filters dust and pollen out of the air.
This filter should be replaced during scheduled
maintenance, refer to page 196, of your vehi‐
cle.
3 AUTO program
4 Display