Mercedes-Benz 190 E2.3 1985 Owner's Manual page 23

Examples of Air Flow Adjustments
0 Press to defrost or quickly defog windows.
Maximum heated air is directed to the windshield and side
windows, independent of the temperature dial (1) setting,
climate control switch (3) and lever (4) position. The air
volume through outlets (8) may be adjusted with levers (9)
as desired.
Air recirculation switch must be off.
B Press to defog the windshield from inside.
Air is directed to the windshield in the heating or cooling
mode. Press button of climate control switch (3) and
increase fan speed for a short period with lever (4). Adjust
levers (9) for the desired air flow through outlets (8).
It is possible for condensation to form on the outside of the
windshield in humid weather in this mode. If this happens,
change the air flow or decrease the fan speed.
Air recirculation switch must be off.
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