Mercedes-Benz ML350 Operator's Manual page 219

Controls in detail
3-zone automatic climate control*
1 Temperature control, left
2 Air distribution and air volume
(automatic, manual)
3 Left side air distribution
4 Defrosting
5 Increase air volume
6 Rear window defroster
7 Right side air distribution
218
8 Rear air conditioning
9 Temperature control, right
a Automatic climate control on/off
b Right side air distribution
c Right side air distribution
d AC cooling on/off (A/C)
Residual heat/ventilation (REST)
e Display
f Decrease air volume
g Air recirculation
h Left side air distribution
j Left side air distribution
k Interior temperature sensor
l Adopt driver zone settings in other
zones