Mercedes-Benz 2009 S-Class Operator's Manual page 404

Controls in detail
Climate control system
! Extreme temperatures can occur in the
storage compartment. Switch off the air
vents in the storage compartment while the
heating is switched on if you are
transporting heat-sensitive items in the
compartment.
Keep the air vents free of obstruction.
Switching ventilation off
1
Switching ventilation on
2
The air volume is dependent on the setting of:
air distribution control
R
air volume control
R
air vents in the dashboard
R
402
The air temperature is about the same as that
of the dashboard air vents. It cannot be
regulated separately.
Rear center console air vents
Left rear center air vent, adjustable
1
Right rear center air vent, adjustable
2
Thumbwheel for air volume control for
3
right rear center air vent
Rear climate control panel
4
Thumbwheel for air volume control for left
5
rear center air vent
X
Opening/closing: Turn thumbwheel
in the required direction.
5
B-pillar air vents
Side air vent, adjustable
1
Thumbwheel for air volume control for
2
side air vent
X
Opening/closing: Turn thumbwheel
the left or to the right.
or
3
to
2