Mercedes-Benz 240 D 1979 Owner's Manual page 33

A u to m a tic C lim ate C ontrol
4 "A U T O -H I" button:
Fast heating or cooling of
vehicle interior.
A ir conditioning, air distribution
and blow er control are the
same as in position "3"
"A U TO -LO ". The blower, h ow ­
ever, operates at a higher
speed.
5 "BI-LEVEL" button:
For fogged-up w indow s.
During heating and cooling
operations air is channelled to
the w indshield and to the fo o t-
well. During the cooling opera­
tion air also enters via the
center swivelling outlets 8.
The vehicle interior is cooled
practically free o f draft w ith
more air being blown into the
footw ell. The blow er then
operates at a higher speed
than "A U T O -L O ".
32
W e recommend this position
at low am bient temperatures.
6 "DEF" button:
For iced-up w indow s.
Independent o f the position of
the tem perature selector
wheel air heated to m axim um
tem perature is channelled to
the windshield.
For the side w indow s, open
swivelling outlets 9.
7 Refrigerant compressor sw itch:
S w itching the air conditioning
compressor on and off.
The compressor can be
sw itched o ff com pletely in the
positions "A U T O -LO " and
"A U T O -H I", e.g. if no cooling
is required because o f low
am bient tem peratures (fuel
econom y).
Fresh air is supplied to the fo o t-
well if the refrigerant com pres­
sor is sw itched o ff w hile the
system is w orking in the cool­
ing mode.
Fresh air enters the vehicle through
the openings in fro n t o f the w in d ­
shield (keep free of snow) and is
em itted through the ventilation
openings below the rear w in d o w if
the side w indow s are closed.
Do not cover up ventilation open­
ings w ith clothes etc.
Im p o rtan t!
In order to keep the air co nd itio n ­
ing section o f the climate control
system in good w orking condition
at all times, it is necessary to
operate the A /C compressor
briefly at least once a m onth even
during the seasons it is norm ally not
required. S w itch compressor
sw itch to "O N " and depress
"A U T O -L O " or "A U T O -H I"
button. Make sure that the am bient
tem perature is above 36° F (2° C)
since the A /C compressor w ill not
operate below this temperature.