Mercedes-Benz 2009 C-Class Operator's Manual page 216

Controls in detail
Climate control system
Function
2 AC cooling on/off
5
T Residual heat/ventilation
6
y Front defroster
7
Temperature control, passenger side
8
¯ Rear window defroster
9
Z Air distribution, passenger side
a
Q Increasing air volume
b
ß Decreasing air volume
c
Display
d
Z Air distribution, driver's side
e
, Air recirculation
f
214
Recommendation/Notes
i
Switches on the air conditioning. The indicator lamp
in button 2 comes on.
i With the engine turned off, it is possible to continue
to heat or ventilate the interior.
i Keep this setting selected only until the windshield
or the side windows are clear again.
i Set the temperature to 72‡ (22†).
i At very low temperatures, rear window defroster
operation is delayed until the vehicle interior has
warmed up.
i Only use this function for a short time, e.g. in a
tunnel. Otherwise, the windows can fog up due to lack
of fresh air.
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