2016 MERCEDES-BENZ G-Class cooling

XTurn the SmartKey to position2(Ypage 112)
in the ignition lock.
XTo activate: press the¬button.
The indicator lamp in the ¬button lights
up.
The climate control system switches to the
following functions:
Rcooling with air dehumidification (only with
engine running)
Rhigh airflow (depending on the outside tem-
perature)
Rhigh temperature (depending on the out-
side temperature)
Rair distribution to the windshield and front
side windows
Rair-recirculation mode off
XTo deactivate: press the¬button.
The indicator lamp in the ¬button goes
out. The previously selected settings are
restored. The cooling with air dehumidifica-
tion function remains on. Air-recirculation
mode remains deactivated.
or
XPress the Ãbutton.
The indicator lamp in the ¬button goes
out. Airflow and air distribution are set to
automatic mode.
or
XTurn controls :orB clockwise or counter-
clockwise (Ypage 100).
or
XPress the KorI button.
Activating/deactivating MAX COOL
maximum cooling
The MAX COOL function is only available in vehi-
cles for the USA.
MAX COOL is only operational when the engine
is running.
XTo activate: press theÙbutton.
The indicator lamp in the button lights up.
XTo 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:
Rmaximum cooling
Rmaximum airflow
Rair-recirculation mode on
Defrosting the windows
Windows fogged up on the inside
XActivate the Ácooling with air dehumidi-
fication function.
XActivate automatic mode Ã.
XIf the windows continue to fog up, activate the
defrosting function (Ypage 105).
iYou should only select this setting until the
windshield is clear again.
Windows fogged up on the outside
XSwitch on the windshield wipers (Ypage 96).
XPress the _button repeatedly until the
P orO symbol appears in the display.
iYou should only select this setting until the
windshield is clear again.
Switching the windshield defroster
on/off
GWARNING
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.
106Operating the climate control systems
Climate control

XTo deactivate:press thedbutton.
The indicator lamp in the dbutton goes
out.
iAir-recirculation mode switches off auto-
matically:
Rafter approximately five minutes at outside
temperatures below approximately 41 ‡
Rafter approximately five minutes if cooling
with air dehumidification is deactivated
Rafter approximately 30 minutes at outside
temperatures above approximately 41 ‡
(5 †)
Convenience opening or closing using
the air-recirculation button
GWARNING
When the convenience closing feature is oper- ating, parts of the body could become trapped
in the closing area of the side window and the
sliding sunroof. There is a risk of injury.
Observe the complete closing procedure
when the convenience closing feature is oper-
ating. Make sure that no body parts are in
close proximity during the closing procedure.
GWARNING
During convenience opening parts of the body could be drawn in or become trapped
between the side window and window frame.
There is a risk of injury.
Make sure that nobody touches the side win-
dow during the opening procedure. If some-
one becomes trapped, immediately press
the W switch in the door to stop the move-
ment of the side windows. To continue closing
the side window, pull on the Wswitch.
XConvenience closing feature: press and
hold the grocker switch up or down until
the side windows and the sliding sunroof start
to close automatically.
The indicator lamp above the grocker
switch lights up. Air-recirculation mode is
activated.
If you manually open the side windows or the
sliding sunroof after closing with the conve- nience closing feature, they will remain in this
position when opened.
If parts of the body are in the closing area during
convenience closing, proceed as follows:
XPress the Wbutton to stop the side win-
dows.
The side window stops.
XTo then open the side windows, press the
W button again.
XPress the 3switch to stop the sliding sun-
roof.
The sliding sunroof stops.
XTo then open the sliding sunroof, pull back on
the 3 switch.
XConvenience opening feature: press and
hold the grocker switch up or down until
the side windows and the sliding sunroof start
to open automatically.
The indicator lamp above the grocker
switch goes out. Air-recirculation mode is
deactivated.
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 tem-
perature that has been set.
iThe blower will run at a low speed regardless
of the airflow setting.
iIf you activate the residual heat function at
high temperatures, only the ventilation will be
activated.
XTurn the SmartKey to position 0(Ypage 112)
in the ignition lock or remove it.
XTo activate: press theÁbutton.
The indicator lamp in the Ábutton lights
up.
108Operating the climate control systems
Climate control

ProblemPossible causes/consequences andMSolutions
?
The red coolant warning
lamp comes on while the
engine is running.The coolant level is too low.
!Avoid making long journeys with too little coolant in the engine
cooling system. The engine will otherwise be damaged.
If the coolant level is correct, the airflow to the engine radiator may be blocked or the electric engine radiator fan may be malfunctioning.
The coolant is too hot and the engine is no longer being cooled suffi-
ciently.
XObserve the additional display messages in the multifunction dis-
play.
XPull over and stop the vehicle safely and switch off the engine, pay-ing attention to road and traffic conditions.
XApply the parking brake.
XLeave the vehicle and keep a safe distance from the vehicle until the
engine has cooled down.
XCheck the coolant level and add coolant, observing the warning
notes (Ypage 238).
XIf you need to add coolant more often than usual, have the engine
coolant system checked.
XMake sure that the air supply to the engine radiator is not blocked,e.g. by snow, slush or ice.
XDo not start the engine again until the coolant temperature is below
248 ‡ (120 †). Otherwise, the engine could be damaged.
XDrive to the nearest qualified specialist workshop.
XAvoid subjecting the engine to heavy loads, e.g. driving in moun-
tainous terrain, and stop-start driving.
?
The red coolant warning
lamp comes on while the
engine is running. A
warning tone also
sounds.The coolant temperature has exceeded 248 ‡(120 †). The airflow to
the engine radiator may be blocked or the coolant level may be too
low.
GWARNING
The engine is not being cooled sufficiently and may be damaged.
Do not drive when your engine is overheated. This can cause some
fluids which may have leaked into the engine compartment to catch
fire.
Steam from the overheated engine can also cause serious burns which
can occur just by opening the hood.
There is a risk of injury.
XObserve the additional display messages in the multifunction dis-
play.
XPull over and stop the vehicle safely and switch off the engine, pay- ing attention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 130).
XLeave the vehicle and keep a safe distance from the vehicle until the
engine has cooled down.
XCheck the coolant level and add coolant, observing the warning
notes (Ypage 238).
Warning and indicator lamps in the instrument cluster211
On-board computer and displays
Z

Working in the engine compartment poses a
risk of injury.
Where possible, let the engine cool down andtouch only the components described in the
following.
GWARNING
If engine oil comes into contact with hot com- ponents in the engine compartment, it may
ignite. There is a risk of fire and injury.
Make sure that engine oil is not spilled next to
the filler neck. Let the engine cool down and
thoroughly clean the engine oil off the com-
ponents before starting the engine.
HEnvironmental note
When adding oil, take care not to spill any. If
oil enters the soil or waterways, it is harmful to
the environment.
!Only use engine oils and oil filters that have
been approved for vehicles with a service sys-
tem. You can obtain a list of the engine oils
and oil filters tested and approved in accord- ance with the Mercedes-Benz Specifications
for Service Products at any Mercedes-Benz
Service center.
Damage to the engine or exhaust system is
caused by the following:
Rusing engine oils and oil filters that have notbeen specifically approved for the service
system
Rreplacing engine oil and oil filters after the
interval for replacement specified by the
service system has been exceeded
Rusing engine oil additives.
!Do not add too much oil. If the oil level is
above the "max" mark on the dipstick, too
much oil has been added. This can lead to
damage to the engine or the catalytic con-
verter. Have excess oil siphoned off.
Example: engine oil cap
XTurn cap :counter-clockwise and remove it.
XAdd the amount of oil required.
Observe the specifications in the on-board com-
puter when doing so or fill carefully to the max-
imum mark on the oil dipstick.
Further information on engine oil (
Ypage 292).
iThe difference between the minimum mark
and the maximum mark on the oil dipstick is
approximately 2.1 US qt (2 l).
XReplace cap :on the filler neck and tighten
clockwise.
Ensure that the cap locks into place securely.
Additional service products
Checking coolant level
GWARNING
Certain components in the engine compart-
ment, such as the engine, radiator and parts
of the exhaust system, can become very hot.
Working in the engine compartment poses a
risk of injury.
Where possible, let the engine cool down and touch only the components described in the
following.
GWARNING
The cooling system is pressurized, particularly
when the motor is warm. If you open the cap,
you could be scalded if hot coolant sprays out.
There is a risk of injury.
238Engine compartment
Maintenance and care

Coolant
Important safety notes
GWARNING
If antifreeze comes into contact with hot com- ponents in the engine compartment, it may
ignite. There is a risk of fire and injury.
Let the engine cool down before you add anti-
freeze. Make sure that antifreeze is not spilled
next to the filler neck. Thoroughly clean the
antifreeze from components before starting
the engine.
!Only add coolant that has been premixed
with the desired antifreeze protection. You
could otherwise damage the engine.
Further information on coolants can be found
in the Mercedes-Benz Specifications for Ser-
vice Products, MB BeVo 310.1, e.g. on the
Internet at http://bevo.mercedes-benz.com.
Or contact a qualified specialist workshop.
!Always use a suitable coolant mixture, even
in countries where high temperatures prevail.
Otherwise, the engine cooling system is not
sufficiently protected from corrosion and
overheating.
iHave the coolant regularly replaced at a
qualified specialist workshop and the replace-
ment confirmed in the Maintenance Booklet.
Comply with the important safety precautions
for service products when handling coolant
(
Ypage 289).
The coolant is a mixture of water and anti-
freeze/corrosion inhibitor. It performs the fol-
lowin g t
asks:
Rcorrosion protection
Rantifreeze protection
Rraising the boiling point
If the coolant has antifreeze protection down to -35 ‡(-37 †), the boiling point of the coolant in
the pressurized system is approximately 266 ‡ (130 †). The antifreeze/corrosion inhibitor concentra-
tion in the engine cooling system should:
Rbe at least 50%. This will protect the engine
cooling system against freezing down to
approximately -35 ‡ (-37 †).
Rnot exceed 55% (antifreeze protection down
to -49
‡[-45 †]) .Otherwise ,hea twill no tbe
dissipated as effectively.
Mercedes-Ben zrecommends an antifreeze/
corrosion inhibitor in accordance wit hMB Spec -
ification sfo rServic eProducts 310.1.
iWhe nth evehicle is first delivered, it is filled
wit h a coolan tmixture that ensures adequat e
antifreez ean dcorrosion protection .
iThe coolantis checke dwit hever ymainte-
nanc einterval at aqualifie dspecialis twork-
shop.
The engin ecoolin gsyste mis filled wit hcoolan t
at th efactory whic hcontain santifreeze/corro-
sio ninhibitor that ensures protection down to
approximately -35 ‡(-37 †) .
Yo ur vehicle has a ran ge of alum
inum compo-
nents. Aluminum components in the engine
make itnecessary to use antifreeze/corrosion
inh ibit or that has been specific allyformulated to
protect the aluminum parts. Failure to use such
anticorrosion/antifreeze coolant willresult in a
significantly shortened service life.
The coolant must beused throughout the year in
order to maintain the necessary corrosion pro-
tection and to provide protection from over-
heating. Inthe Maintenance Booklet, you can
find information on the intervals for renewal.
The renewal interval is determined bythe cool-
ant type and the engine co oling system design.
The renewal interval in the Maintenance Booklet
is only valid if the coolant is renewed or added to
wit h Mercedes-Benz approved products. There-
fore, only use MB 326.0 antifreeze/corrosion
inh ibit or or another Mercedes-Benz approved
product of the same specification.
In formation on other products with the same
specifications that are approved byMercedes-
Benz can beobtained at an authorized
Mercedes-Benz Center or on the Internet at
ht tp://bevo.mercedes-benz.com .
If the coolant level is too low, MB 325.0 anti-
freeze/corrosion inh ibitor should beadded.
Have the engine co oling system c
hecked for
possible leaks.
294Service products and filling capacities
Technical data

For vehicles with steel springs, loaded and ready
to drive means: a full tank, all fluids refilled and
the driver is in the vehicle.
:;
G 55030°30°
G 63 AMG27°27°
For further information about approach/depar-
ture angles, see (Ypage 140).
Maximum gradient-climbing capabil-
ity
Note that the vehicle's gradient-climbing capa-
bility depends on the off-road conditions and theroad surface conditions.
On good road surfaces the maximum gradient-
climbing capability of your vehicle is 100%,
which corresponds to an approach/departure
angle of 45°.
Accelerate carefully and make sure that the
wheels do not spin when driving on steep ter-
rain.
iIf the load on the front axle is reduced when
pulling away on a steep uphill slope, the front
wheels have a tendency to spin. 4ETS detects this and brakes the wheels accordingly. The
rear wheel torque is increased, making it eas-
ier to drive off.
For further information about the maximum gra-
dient climbing ability, see (
Ypage 140).
Trailer tow hitch
Mounting dimensions
!
If you have a trailer tow hitch retrofitted,
changes to the engine cooling system may be
necessary, depending on the vehicle type.
If you have a trailer tow hitch retrofitted,
observe the anchorage points on the chassis
frame.
:Anchorage points
;Overhang dimension
For trailer tow hitches installed at the factory,
the overhang dimension including protective
covering is 35.2 in (895 mm).
Trailer tow hitch297
Technical data
Z