Mercedes-Benz 2006 E 320 CDI Operator's Manual page 217

Controls in detail
4-zone automatic climate control*
USA only
1 Air distribution, left
2 Front defroster
3 Temperature rocker switch, left
4 Display
5 Temperature rocker switch, right
6 Rear window defroster
216
7 Air distribution, right
8 Air distribution and air volume, right
(automatic, manual)
9 AC cooling on/off
a Rear air-conditioning remote control
b Increase air volume
c Climate control on/off
d Decrease air volume
e Air recirculation
f Air distribution and air volume, left
(automatic, manual)