Mercedes-Benz 240 D 1979 Owner's Manual page 29

A ir C onditioning System
The tem perature inside the vehicle
can be lowered by means of the air
conditioning system. W hen tem per­
ature sw itch 8 is sw itched on, the
air is passed over an evaporator
and is thus cooled and dehydrated
at the same time.
The air is circulated by a blower
and may be distributed according
to preference by means o f the
ventilation system controls.
The air conditioning system is oper­
ative only w hen the engine is run­
ning. High engine speed produces
a high refrigerant compressor
speed w hich in turn means in­
creased cooling.
28
8 Tem perature sw itch. Sw itch on
by turning to the right. The
cooling effect is increased up
to the stop. A fte r 2/ 3 o f the
sw itch travel, the system
changes over from fresh air
cooling to recirculation air co ol­
ing w ith a small proportion o f
fresh air.
The blow er (switch 1) m ust
then be sw itched on. W e re­
com m end selecting a higher
blow er speed fo r increased
cooling effect.
By pulling the temperature
sw itch cooled air may also be
passed to the footw ell.
Note:
In case o f dust and odor annoy­
ance from outside, turn tem pera­
ture sw itch to recirculation cooling
w ith a small proportion o f fresh air.