Mercedes-Benz 190 E 2.6 1989 Owner's Manual page 28

^ Press for heating.
In this type of operation, air is directed to the windshield
and the foot area. The air outlets (7) may be opened or
closed with levers (8) as desired.
If the ambient temperature is above 0°C (32 °F) the air
conditioning compressor may switch on automatically to
dry the heated air.
26
Most of the air is directed to the foot area during heater
operation. A small amount of air is directed to the wind­
shield, just enough to keep it from fogging up during nor­
mal weather conditions. The air outlets (5) and (7) may be
opened or closed with levers (6) and (8) respectively as
desired. Only non-heated air is directed through outlets (5).