Mercedes-Benz 380 SE 1984 Owner's Manual page 36

Automatic Climate Control
0 Defrosting
The maximum amount of heated air is directed to the
windshield and side windows, regardless of tempera­
ture and fan speed setting.
Note:
The air conditioner removes considerable moisture
from the air during operation. It is normal if water drips
on the ground through openings in the car floor.
0 Defrosting