1990-2018 Mercedes G Class SUV Climate control User Manual
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Climate control for Your Mercedes G Class SUV Third Generation (1990-2018)

Useful information ............................ 118
Overview of climate control sys-
tems ................................................... 118
Operating the climate control sys-
tems ................................................... 121
Setting the air vents ......................... 134
117
Climate control
Useful information
i
This Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please note that your vehicle may
not be equipped with all features
described. This also applies to safety-
related systems and functions.
i
Read the information on qualified
specialist workshops: (Y page 24).
Overview of climate control systems
Important safety notes
G
WARNING
Severe conditions (e.g. strong air pollution)
may require replacement of the filter before
its scheduled replacement interval. A clogged
filter will reduce the air volume to the interior
and the windows could fog up, impairing
visibility and endangering you and others.
Have a blocked filter replaced at a Mercedes-
Benz Center as soon as possible.
Observe the settings recommended on the
following pages. The windows could
otherwise fog up. This could prevent you from
observing the traffic conditions, thereby
causing an accident.
Dual-zone automatic climate control
regulates the temperature and the humidity
in the vehicle interior and filters undesirable
substances from the air.
Automatic climate control is only operational
when the engine is running. Optimum
operation is only achieved if you drive with the
side windows and sliding sunroof closed.
The climatic comfort deteriorates whilst the
sliding sunroof is open. The automatic climate
control cannot maintain the set temperature
with the sliding sunroof open. You have to
adjust the climate control manually.
i
The residual heat function can only be
activated or deactivated with the ignition
switched off.
i
The residual heat function can only be
activated or deactivated with the ignition
switched off (Y page 134).
i
Ventilate the vehicle for a brief period
during warm weather, e.g. using the
convenience opening feature (Y page 78).
This will speed up the cooling process and
the desired vehicle interior temperature
will be reached more quickly.
i
The integrated filter can filter out most
particles of dust, and completely filters out
pollen. A clogged filter reduces the amount
of air supplied to the vehicle interior. For
this reason, you should always observe the
interval for replacing the filter, which is
specified in the Maintenance Booklet. As it
depends on environmental conditions, e.g.
heavy air pollution, the interval may be
shorter than stated in the Maintenance
Booklet.
118
Overview of climate control systems
Climate control
Control panel for dual-zone automatic climate control
Canada only
:
Sets the temperature, left (Y page 131)
;
Defrosts the windshield (Y page 131)
=
Switches the ZONE function on/off (Y page 131)
?
Activates/deactivates cooling with air dehumidification (Y page 124)
A
Switches the rear window defroster on/off(Y page 133)
B
Sets the temperature, right (Y page 131)
C
Activates/deactivates air-recirculation mode (Y page 134)
D
Sets the air distribution (Y page 131)
E
Increases the airflow (Y page 131)
F
Reduces the airflow (Y page 131)
G
Display
H
Switches climate control on/off (Y page 121)
I
Sets climate control to automatic (Y page 130)
Overview of climate control systems
119
Climate control
Z
USA only
:
Sets the temperature, left (Y page 131)
;
Defrosts the windshield (Y page 131)
=
Switches maximum cooling MAX COOL on/off (Y page 132)
?
Activates/deactivates cooling with air dehumidification (Y page 124)
A
Switches the rear window defroster on/off(Y page 133)
B
Sets the temperature, right (Y page 131)
C
Activates/deactivates air-recirculation mode (Y page 134)
D
Sets the air distribution (Y page 131)
E
Increases the airflow (Y page 131)
F
Reduces the airflow (Y page 131)
G
Display
H
Switches climate control on/off (Y page 121)
I
Sets climate control to automatic (Y page 130)
Information about using dual-zone
automatic climate control
The following contains notes and
recommendations on optimum use of
automatic climate control.
R
Activate climate control using the à and
Á buttons. The indicator lamps in the
à and Á buttons light up.
R
Set the temperature to 72 ‡ (22 †).
R
Only use the "defrosting" function briefly
until the windshield is clear again.
R
Only use "air-recirculation" mode briefly,
e.g. if there are unpleasant outside odors
or when in a tunnel. The windows could
otherwise fog up, since no fresh air is drawn
into the vehicle in air-recirculation mode.
R
Use the ZONE function to adopt the
temperature settings on the driver's side
for the front-passenger side as well. The
indicator lamp in the á button goes out.
120
Overview of climate control systems
Climate control
Operating the climate control systems
Switching climate control on/off
Points to observe before use
G
WARNING
When the climate control system is deactivated, the outside air supply and circulation are also
deactivated. Only choose this setting for a short time. Otherwise the windows could fog up,
impairing visibility and endangering you and others.
Switching climate control on
Canada only
:
Sets the temperature, left (Y page 131)
;
Defrosts the windshield (Y page 131)
=
Switches the ZONE function on/off (Y page 131)
?
Activates/deactivates cooling with air dehumidification (Y page 124)
A
Switches the rear window defroster on/off(Y page 133)
B
Sets the temperature, right (Y page 131)
C
Activates/deactivates air-recirculation mode (Y page 134)
D
Sets the air distribution (Y page 131)
E
Increases the airflow (Y page 131)
F
Reduces the airflow (Y page 131)
G
Display
H
Switches climate control on/off (Y page 121)
I
Sets climate control to automatic (Y page 130)
Operating the climate control systems
121
Climate control
Z
X
Turn the SmartKey to position 2 (Y page 139) in the ignition lock.
X
Press the à button.
The indicator lamp in the à button lights up. Airflow and air distribution are set to
automatic mode.
or
X
Press the ^ button.
The indicator lamp in the ^ button goes out. The previously selected settings are
restored.
USA only
:
Sets the temperature, left (Y page 131)
;
Defrosts the windshield (Y page 131)
=
Switches maximum cooling MAX COOL on/off (Y page 132)
?
Activates/deactivates cooling with air dehumidification (Y page 124)
A
Switches the rear window defroster on/off(Y page 133)
B
Sets the temperature, right (Y page 131)
C
Activates/deactivates air-recirculation mode (Y page 134)
D
Sets the air distribution (Y page 131)
E
Increases the airflow (Y page 131)
F
Reduces the airflow (Y page 131)
G
Display
H
Switches climate control on/off (Y page 121)
I
Sets climate control to automatic (Y page 130)
122
Operating the climate control systems
Climate control
X
Turn the SmartKey to position 2 (Y page 139) in the ignition lock.
X
Press the à button.
The indicator lamp in the à button lights up. Airflow and air distribution are set to
automatic mode.
or
X
Press the ^ button.
The indicator lamp in the ^ button goes out. The previously selected settings are
restored.
Switching off climate control
Canada only
:
Sets the temperature, left (Y page 131)
;
Defrosts the windshield (Y page 131)
=
Switches the ZONE function on/off (Y page 131)
?
Activates/deactivates cooling with air dehumidification (Y page 124)
A
Switches the rear window defroster on/off(Y page 133)
B
Sets the temperature, right (Y page 131)
C
Activates/deactivates air-recirculation mode (Y page 134)
D
Sets the air distribution (Y page 131)
E
Increases the airflow (Y page 131)
F
Reduces the airflow (Y page 131)
G
Display
H
Switches climate control on/off (Y page 121)
I
Sets climate control to automatic (Y page 130)
X
Press the ^ button.
The indicator lamp in the ^ button lights up.
Operating the climate control systems
123
Climate control
Z
USA only
:
Sets the temperature, left (Y page 131)
;
Defrosts the windshield (Y page 131)
=
Switches maximum cooling MAX COOL on/off (Y page 132)
?
Activates/deactivates cooling with air dehumidification (Y page 124)
A
Switches the rear window defroster on/off(Y page 133)
B
Sets the temperature, right (Y page 131)
C
Activates/deactivates air-recirculation mode (Y page 134)
D
Sets the air distribution (Y page 131)
E
Increases the airflow (Y page 131)
F
Reduces the airflow (Y page 131)
G
Display
H
Switches climate control on/off (Y page 121)
I
Sets climate control to automatic (Y page 130)
X
Press the ^ button.
The indicator lamp in the ^ button lights up.
Activating/deactivating cooling with air dehumidification
Points to observe before use
G
WARNING
If you switch off the cooling function, the vehicle will not be cooled when weather conditions are
warm. The windows can fog up more quickly. Window fogging may impair visibility and endanger
you and others.
The "Cooling with air dehumidification" function is only available when the engine is running.
The air inside the vehicle is cooled and dehumidified according to the temperature selected.
124
Operating the climate control systems
Climate control
Condensation may drip from the underside of the vehicle when it is in cooling mode. This is
normal and not a sign that there is a malfunction.
Activating the cooling with air dehumidification function
!
If the cooling with air dehumidification does not switch on, it is possible that the climate
control system has lost coolant.
Have the cooling with air dehumidification checked at a qualified specialist workshop.
Canada only
:
To set the temperature, left (Y page 131)
;
To defrost the windshield (Y page 131)
=
To switch the ZONE function on/off (Y page 131)
?
To switch cooling with air dehumidification on/off (Y page 124)
A
To switch the rear window defroster on/off (Y page 133)
B
To set the temperature, right (Y page 131)
C
To activate/deactivate air-recirculation mode (Y page 134)
D
To set the air distribution (Y page 131)
E
To increase the airflow (Y page 131)
F
To reduce the airflow (Y page 131)
G
Display
H
To switch climate control on/off (Y page 121)
I
To set climate control to automatic (Y page 130)
X
Press the Á button.
The indicator lamp in the Á button lights up.
Operating the climate control systems
125
Climate control
Z
USA only
:
To set the temperature, left (Y page 131)
;
To defrost the windshield (Y page 131)
=
To switch maximum cooling on/off (Y page 132)
?
To switch cooling with air dehumidification on/off (Y page 124)
A
To switch the rear window defroster on/off (Y page 133)
B
To set the temperature, right (Y page 131)
C
To activate/deactivate air-recirculation mode (Y page 134)
D
To set the air distribution (Y page 131)
E
To increase the airflow (Y page 131)
F
To reduce the airflow (Y page 131)
G
Display
H
To switch climate control on/off (Y page 121)
I
To set climate control to automatic (Y page 130)
X
Press the Á button.
The indicator lamp in the Á button lights up.
126
Operating the climate control systems
Climate control
Switching off the cooling with air dehumidification
Canada only
:
To set the temperature, left (Y page 131)
;
To defrost the windshield (Y page 131)
=
To switch the ZONE function on/off (Y page 131)
?
To switch cooling with air dehumidification on/off (Y page 124)
A
To switch the rear window defroster on/off (Y page 133)
B
To set the temperature, right (Y page 131)
C
To activate/deactivate air-recirculation mode (Y page 134)
D
To set the air distribution (Y page 131)
E
To increase the airflow (Y page 131)
F
To reduce the airflow (Y page 131)
G
Display
H
To switch climate control on/off (Y page 121)
I
To set climate control to automatic (Y page 130)
X
Press the Á button.
The indicator lamp in the Á button goes out. The "Cooling with air dehumidification"
function has a delayed switch-off feature.
Operating the climate control systems
127
Climate control
Z
USA only
:
To set the temperature, left (Y page 131)
;
To defrost the windshield (Y page 131)
=
To switch maximum cooling on/off (Y page 132)
?
To switch cooling with air dehumidification on/off (Y page 124)
A
To switch the rear window defroster on/off (Y page 133)
B
To set the temperature, right (Y page 131)
C
To activate/deactivate air-recirculation mode (Y page 134)
D
To set the air distribution (Y page 131)
E
To increase the airflow (Y page 131)
F
To reduce the airflow (Y page 131)
G
Display
H
To switch climate control on/off (Y page 121)
I
To set climate control to automatic (Y page 130)
X
Press the Á button.
The indicator lamp in the Á button goes out. The "Cooling with air dehumidification"
function has a delayed switch-off feature.
128
Operating the climate control systems
Climate control
Problems with the "Cooling with air dehumidification" function
Canada only
:
To set the temperature, left (Y page 131)
;
To defrost the windshield (Y page 131)
=
To switch the ZONE function on/off (Y page 131)
?
To switch cooling with air dehumidification on/off (Y page 124)
A
To switch the rear window defroster on/off (Y page 133)
B
To set the temperature, right (Y page 131)
C
To activate/deactivate air-recirculation mode (Y page 134)
D
To set the air distribution (Y page 131)
E
To increase the airflow (Y page 131)
F
To reduce the airflow (Y page 131)
G
Display
H
To switch climate control on/off (Y page 121)
I
To set climate control to automatic (Y page 130)
When you press the Á button, the indicator lamp in the button flashes three times or
remains off. You can no longer switch on the "Cooling with air dehumidification" function.
X
Visit a qualified specialist workshop.
Operating the climate control systems
129
Climate control
Z
USA only
:
To set the temperature, left (Y page 131)
;
To defrost the windshield (Y page 131)
=
To switch maximum cooling on/off (Y page 132)
?
To switch cooling with air dehumidification on/off (Y page 124)
A
To switch the rear window defroster on/off (Y page 133)
B
To set the temperature, right (Y page 131)
C
To activate/deactivate air-recirculation mode (Y page 134)
D
To set the air distribution (Y page 131)
E
To increase the airflow (Y page 131)
F
To reduce the airflow (Y page 131)
G
Display
H
To switch climate control on/off (Y page 121)
I
To set climate control to automatic (Y page 130)
When you press the Á button, the indicator lamp in the button flashes three times or
remains off. You can no longer switch on the "Cooling with air dehumidification" function.
X
Visit a qualified specialist workshop.
Setting climate control to automatic
G
WARNING
If you switch off the cooling function, the
vehicle will not be cooled when weather
conditions are warm. The windows can fog up
more quickly. Window fogging may impair
visibility and endanger you and others.
In automatic mode, the set temperature is
maintained at a constant level. The system
automatically regulates the temperature of
the dispensed air, the airflow and the air
distribution.
Automatic mode will achieve optimal
operation if cooling with air dehumidification
is also activated. If desired, cooling with air
dehumidification can be deactivated.
130
Operating the climate control systems
Climate control
X
Turn the SmartKey to position
2 (Y page 139) in the ignition lock.
X
Set the desired temperature.
X
To switch on: press the à button.
The indicator lamp in the à button lights
up. Automatic air distribution and airflow
are activated.
X
To deactivate: press the _ button.
or
X
Press the I or K button.
The indicator lamp in the à button goes
out.
Setting the temperature
You can set the temperature separately for
the driver's and front-passenger sides with
controls : or B(Y page 119).
X
Turn the SmartKey to position
2 (Y page 139) in the ignition lock.
X
Set control : or B(Y page 119) to the
desired temperature.
Only change the temperature setting in
small increments. Start at 72 ‡ (22 †).
Setting the air distribution
X
Turn the SmartKey to position
2 (Y page 139) in the ignition lock.
X
Press the _ button repeatedly until the
desired symbol appears in the display.
P
Directs the airflow through the center
vents
O
Directs the airflow through the
footwell air vents
S
Directs the airflow through the center
and footwell vents
¯
Directs air through the defroster vents
b
Canada only: directs the airflow
through the defroster and center vents
a
Directs air through the defroster and
footwell vents
_
Canada only: directs the airflow
through the defroster, center and side
air vents and the footwell
Setting the airflow
X
Turn the SmartKey to position
2 (Y page 139) in the ignition lock.
X
To increase: press the K button.
X
To reduce: press the I button.
i
The airflow from the rear-compartment
vents and the center vents is the same.
Switching the ZONE function on/off
X
To switch on: press the á button.
The indicator lamp in the á button lights
up.
i
The temperature setting for the driver's
side is not adopted for the front-passenger
side and the rear compartment. The
temperature for the front-passenger side
and the rear compartment must be set
separately.
X
To switch off: press button á.
The indicator lamp in the á button goes
out.
i
The temperature setting for the driver's
side is adopted for the front-passenger side
and the rear compartment.
Defrosting the windshield
You can use this function to defrost the
windshield or to defrost the inside of the
windshield and the side windows.
i
You should only select the defrosting
function until the windshield is clear again.
Operating the climate control systems
131
Climate control
Z
X
Turn the SmartKey to position
2 (Y page 139) in the ignition lock.
X
To activate: press the ¬ button.
The indicator lamp in the ¬ button lights
up.
The climate control system switches to the
following functions:
R
cooling with air dehumidification (only
with engine running)
R
high airflow (depending on the outside
temperature)
R
high temperature (depending on the
outside temperature)
R
air distribution to the windshield and
front side windows
R
air-recirculation mode off
X
To deactivate: press the ¬ button.
The indicator lamp in the ¬ button goes
out. The previously selected settings are
restored. The cooling with air
dehumidification function remains on. Air-
recirculation mode remains deactivated.
or
X
Press the à button.
The indicator lamp in the ¬ button goes
out. Airflow and air distribution are set to
automatic mode.
or
X
Turn controls : or B clockwise or
counter-clockwise (Y page 119).
or
X
Press the K or I button.
Activating/deactivating MAX COOL
maximum cooling
The MAX COOL function is only available in
vehicles for the USA.
MAX COOL is only operational when the
engine is running.
X
To activate: press the Ù button.
The indicator lamp in the button lights up.
X
To activate: press off-road button Ù
again.
The indicator lamp goes out. The previously
selected settings are restored.
When you activate MAX COOL, climate
control switches to the following functions:
R
maximum cooling
R
maximum airflow
R
air-recirculation mode on
Defrosting the windows
Windows fogged up on the inside
X
Activate the Á cooling with air
dehumidification function.
X
Activate automatic mode Ã.
X
If the windows continue to fog up, activate
the defrosting function (Y page 131).
i
You should only select this setting until
the windshield is clear again.
Windows fogged up on the outside
X
Switch on the windshield wipers
(Y page 114).
X
Press the _ button repeatedly until the
P or O symbol appears in the
display.
132
Operating the climate control systems
Climate control
i
You should only select this setting until
the windshield is clear again.
Switching the windshield defroster
on/off
G
WARNING
Any accumulation of snow and ice should be
removed from the windshield before driving.
Otherwise, your vision may be impaired,
which could endanger you or others.
X
Turn the SmartKey to position
2 (Y page 139) in the ignition lock.
X
To switch on: press button ;.
Indicator lamp : lights up.
X
To switch off: press button ;.
Indicator lamp : goes out.
i
At outside temperatures above
50 ‡(10 †), the windshield heating cannot
be activated. Indicator lamp : lights up
briefly when you attempt to activate it and
then goes out again.
i
The windshield defroster has a high
current draw. You should therefore switch
it off as soon as the windshield is clear. The
windshield heating otherwise switches
itself off automatically after 10 minutes.
i
If you turn on the windshield heating for
the fourth consecutive time, the windshield
heating will automatically switch off after
5 minutes.
i
If the vehicle's electrical system voltage
is too low because too many electrical
consumers are switched on, indicator
lamp : flashes. After approximately
30 seconds, the windshield heating turns
off automatically.
Switching the rear window defroster
on/off
Activating/deactivating
G
WARNING
Any accumulation of snow and ice should be
removed from the rear window before driving.
Visibility could otherwise be impaired,
endangering you and others.
X
Turn the SmartKey to position
2 (Y page 139) in the ignition lock.
X
USA only: press the ª button.
The indicator lamp in the ª button lights
up or goes out.
i
The rear window defroster has a high
current draw. You should therefore switch
it off as soon as the rear window is clear.
as it only switches off automatically after
several minutes.
i
If the battery voltage is too low, the rear
window defroster may switch off.
Problems with the rear window
defroster
If the indicator lamp in the ª rear window
defroster button flashes, the on-board
voltage is too low. The rear window defroster
has deactivated prematurely or cannot be
activated.
X
Switch off any consumers that are not
required, e.g. reading lamps or interior
lighting.
When the battery is sufficiently charged,
the rear window defroster is activated
again automatically.
Operating the climate control systems
133
Climate control
Z
Activating/deactivating air-
recirculation mode
G
WARNING
Fogged windows impair visibility,
endangering you and others. If the windows
begin to fog on the inside, switching off the
air recirculation mode immediately should
clear interior window fogging. If interior
window fogging persists, make sure the air
conditioning is activated, or press the ¬
button.
X
Turn the SmartKey to position
2 (Y page 139) in the ignition lock.
X
To switch on: press the d button.
The indicator lamp in the d button lights
up.
i
Air-recirculation mode is automatically
activated at high levels of pollution or at
high outside temperatures. When air-
recirculation mode is activated
automatically, the indicator lamp in the
d button is not lit.
Outside air is added after approximately
30 minutes.
X
To deactivate: press the d button.
The indicator lamp in the d button goes
out.
i Air-recirculation mode switches off
automatically:
R
after approximately five minutes at
outside temperatures below
approximately 41 ‡
R
after approximately five minutes if
cooling with air dehumidification is
deactivated
R
after approximately 30 minutes at
outside temperatures above
approximately 41 ‡ (5 †)
Activating/deactivating the residual
heat function
The "residual heat" function is only available
in Canada.
It is possible to make use of the residual heat
of the engine to continue heating the
stationary vehicle for up to 30 minutes after
the engine has been switched off. The heating
time depends on the coolant temperature and
on the interior temperature that has been set.
i
The blower will run at a low speed
regardless of the airflow setting.
i
If you activate the residual heat function
at high temperatures, only the ventilation
will be activated.
X
Turn the SmartKey to position
0(Y page 139) in the ignition lock or
remove it.
X
To activate: press the Á button.
The indicator lamp in the Á button lights
up.
X
To deactivate: press the Á button.
The indicator lamp in the Á button goes
out.
i Residual heat is deactivated
automatically:
R
after approximately 30 minutes
R
when the ignition is switched on
R
if the battery voltage drops
R
if the coolant temperature is too low
Setting the air vents
Important safety notes
G
WARNING
When operating the climate control, the air
that enters the passenger compartment
through the air vents can be very hot or very
cold (depending on the set temperature). This
could cause burns or frostbite to unprotected
skin in the immediate area of the air vents.
134
Setting the air vents
Climate control
Always keep sufficient distance between
unprotected parts of the body and the air
vents. If necessary, use the air distribution
adjustment to direct the air to air vents in the
vehicle interior that are not in the immediate
area of unprotected skin.
General notes
In order to ensure the direct flow of fresh air
through the air vents into the vehicle interior,
please observe the following notes:
R
keep the air intake grill on the hood free of
blockages, such as ice, snow or leaves.
R
never cover the air vents or air intake grilles
in the vehicle interior.
i
For virtually draft-free ventilation, adjust
the sliders of the air vents to the center
position.
i
If the automatic climate control
constantly differs from the set temperature
or if undesired drafts are noticeable,
proceed as follows:
X
Open the side air vents
X
Open the center air vents
X
Open the rear air vents
X
Set the temperature to 72 ‡ (22 †).
The automatic climate control adjusts
to the set temperature.
Setting the center air vents
Center air vents
:
Center air vent, left
;
Center air vent, right
=
Center vent thumbwheel, right
?
Center vent thumbwheel, left
X
To open/close: turn thumbwheels =
and ? to the right or left.
Setting the side air vents
Side air vents
:
Side air vent
;
Swiveling side air vent
=
Control for side air vent
X
To open/close: turn thumbwheel = to the
left or right.
Setting the air vents
135
Climate control
Z
Setting the rear-compartment air
vents
X
To open/close: turn thumbwheel : up or
down.
X
To set the air direction: move slider ;
for the corresponding rear-compartment
air vent to the left, right, up or down.
136
Setting the air vents
Climate control

Related Topics

Useful information Overview of climate control systems Operating the climate control systems Setting the air vents

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