Mercedes-Benz 2007 E -Class Wagon Operator's Manual page 209

Controls in detail
Dual-zone automatic climate control
USA only
1 Temperature control, driver's side
2 Front defroster
3 Increasing air volume
4 Display
5 Air distribution
208
6 Rear window defroster
7 Temperature control, passenger side
8 MAX COOL on/off
9 AC cooling on/off
a Climate control on/off
b Decreasing air volume
c Air recirculation
d Air distribution and air volume
(automatic, manual)