Mercedes-Benz 2009 E-Class Operator's Manual page 182

Controls in detail
Climate control system
Control panels
Dual-zone automatic climate control
Function
Temperature control, driver's side
1
y Front defroster
2
Q Increasing air volume
3
180
Recommendation/Notes
i Set the temperature to 72‡ (22†).
i Keep this setting selected only until the windshield
or the side windows are clear again.
( Y page 186)
( Y page 190)
( Y page 190)