2017 MERCEDES-BENZ G-Class cooling

by increasing the speed. Reduce vehicle
speed and do not countersteer. Apply the
brake as necessary.
GWARNING
If you install aball coupling other than the one
delivered with the vehicle, the trailer tow hitch
and the rear axle may be overloaded. This
applies especially if the ball coupling in ques-
tion is longer or angled differently. This could
seriously impair the driving characteristics
and the trailer can come loose. There is arisk
of an accident.
Only install the ball coupling delivered with
the vehicle or aball coupling that is designed
to meet your trailer towing requirements. Do
not modify the ball coupling or the trailer tow
hitch.
GWARNING
If the ball coupling is not installed correctly or not secured with the bolt provided and the
correspondin gspring cotter, the trailer may
come loose. There is arisk of an accident.
Always install and secure the ball coupling as
described. Beforee very journey, ensure that
the ball coupling is secured with the bolt and
the correspondin gspring cotter.
!If you have atrailer tow hitc hretrofitted,
changes to the engin ecooling system may be
necessary, dependin gonthe vehicle type.
If you have atrailer tow hitc hretrofitted,
observe the anchorage point sonthe chassis
frame.
The installation of atrailer tow hitc hisonly per-
missible if atowing weight is specified in your
vehicle documents. If this is not the case, then
the vehicle is not approved for the towing of a
trailer.
For more information ,please contact aqualified
specialist workshop.
Please observe the manufacturer's operating
instructions for the trailer coupling if adetach-
able trailer coupling is used.
Exceeding the maximum permissible nose-
weight of the trailer drawbar on the ball coupling may cause damage. Damage may be caused to the following:
RTowing vehicle
RTrailer
RBall coupling
RTrailer tow hitch
The vehicle/trailer combination could become
unstable.
If the noseweight used is lower than the mini-
mum permissible noseweight ,the vehicle/
trailer combination could also become unstable.
To avoid hazardous situations:
Rmake sure to checkt he noseweight before
each journey
Ruse adrawbar noseweight as close as possi-
ble to the maximum noseweight
Rdo not exceed the maximum permissible
noseweight
Rthe noseweight must not be lower than the
minimum permissible noseweight
Make sure that the following values are not
exceeded:
Rthe permissible trailer drawbar noseweight
Rthe permissible trailer load
Rthe permissible rear axle load of the towing
vehicle
Rthe maximum permissible gross vehicle
weight of both the towing vehicle and the
trailer
When backin gupthe vehicle towards the trailer,
make sure ther eisnobody between the trailer
and the vehicle.
The applicable permissible values, which must
not be ex
ceeded, can be found:
Rin your vehicle documents
Ron the type plate for the trailer
Ron the vehicle identification plate
If the values differ, the lowest value applies.
You will find the values approved by the manu-
facturer on the vehicle identification plates and
those for the towing vehicle under "Technical
data" (
Ypage 284).
When backin gupthe vehicle towards the trailer,
make sure ther eisnobody between the trailer
and the vehicle.
Couple and uncouple the trailer carefully. If you
do not couple the trailer to the towing vehicle
correctly, the trailer could become detached.
150Towing atrailer
Driving and parking

Warning/
indicator
lampNSignal type
Possiblec auses/consequences and M
Solutions
?NThe red coolant warning lamp comes on while the engine is running.
The coolant levelist oo low.
If the coolant levelisc orrect, the airflow to the engine radiator may be blocked or
the electric engine radiator fan may be defective.
The coolant is too hot and the engine is no longer being cooleds ufficiently.
XObserve the additionaldisplay messages in the multifunction display.
XPullover and stop the vehicles afelyand switch off the engine, paying attention
to road and traffic conditions.
XSecure the vehiclea gainst rolling away(Ypage120).
XLeave the vehiclea nd keepasafe distance from the vehicleu ntil the engine has
cooledd own.
XCheck the coolant levela nd add coolant, observing the warning notes
(Ypage2 29).
XIf you have to add coolant frequently, have the engine cooling 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 gauge is below the H
marking (Ypage1 58). Otherwise, the engine coul dbedamaged.
XDrive to the neares tqualified specialist workshop.
XAvoid heavy loads on the engine as you do so, e.g. driving in mountainous terrain
and stop-and-go traffic.
?N The red coolant warning lamp comes on while the engine is running.
The coolant temperature gauge has exceededt heHmarking (
Ypag e158) .The
airflow to the engine radiator may be blocked or the coolant levelm ay be too low.
GWARNING
The engine is not being cooleds ufficiently and may be damaged.
Do not drive when you rengine is overheated. This can caus esome fluids which
may have leaked into the engine compartment to catch fire.
Steam from the overheated engine can als ocaus eserious burns which can occur
just by opening the hood.
There is arisk of injury.
XObserve the additiona ldisplay messages in the multifunction display.
XPul lover and stop the vehicles afelyand switch off the engine, paying attention
to road and traffic conditions.
XSecure the vehiclea gainst rolling away(Ypage120).
XLeave the vehiclea nd keepasafe distance from the vehicleu ntil the engine has
cooledd own.
XCheck the coolant levela nd add coolant, observing the warning notes
(Ypage2 29).
XIf you have to add coolant frequently, have the engine cooling system checked.
XMake sure that the air supply to the engine radiator is not blocked,e .g. by snow,
slush or ice.
Warning and indicator lamps in the instrument cluster195
On-board computer and displays
Z

Using the 115Vpower socketXTo switch on: switchthe ignition on.
XOpen flap :.
XInsert the plug of the electronic device into
115Vpower socket ;.
Indicator lamp =lights up.
XTo switch off: disconnectthe plug from
115 Vpower socket ;.
Ensure that you do not pull on the cord.
Problem swith the 115 Vpower socket
ProblemPossible causes/consequences and MSolutions
The warninglamp on the
115 Vpower socket is
not lit.The on-board voltage is too low because the battery is too weak.
XStart the engine.
or
XCharge the battery (Ypage 243).
If the indicator lamp still does not light up:
XVisit aqualified specialist workshop.
The temperature of the DC/A Cconverter is temporarily too high.
XRemove the electronic device connector from the 115 Vsocket.
XLet the DC/A Cconverter cool down.
If the indicator lamp still does not light up after coolingd own the
converter:
XVisit aqualified specialist workshop.
You have connected an electronic device that has aconstan tnominal
power of less than 150 watts, but has avery high switch-on current.
This device will not work. If you connec tsuch adevice, the 115 V
power socket will not supply it with power.
XConnect asuitable electronic device.
mbrace
Genera lnotes
The mbrace system is only available in the USA.
You must have alicens eagreementtoa ctivate
the mbrace service. Make sure that your system
is activated and operational. To register, press
the ï Infoc all button. If any of the steps
mentioned are not carried out, the system may
not be activated. If you have question
sabout the activation ,con-
tact one of the following telephon ehotlines:
Mercedes-Benz Customer Assistance Center at 1-800-FOR-MERCedes (1-800-367-6372) or
1-866-990-9007
Shortly after successfully registering with the
mbrace service, auser ID and password will be
sent to you by mail. You can use this password
to log ont othe mbrace area under "Owners
Online" at http://www.mbusa.com.
214Features
Stowage and features

If you need to do any work inside the engine
compartment:
Rswitch off the ignition
Rnever reach into the area where there is a
risk of danger from moving components,
such as the fan rotation area
Rremove jewelry and watches
Rkeep items of clothing and hair, for exam-
ple, awayfrom moving parts
GWARNING
The cooling system is pressurized, particularly
when the motor is warm. If you open the cap,
you could be scaldedifh ot coolant spraysout.
There is arisk of injury.
Let the engine cool down before you open the
cap. Wear gloves and eye protection. Slowly
open the cap to relieve pressure.
GWARNING
Opening the hood when the engine is over-
heated or when there is afire in the engine
compartment could expose you to hot gases
or other service products. There is arisk of
injury.
Let an overheated engine cool down before
opening the hood. If there is afire in the
engine compartment, keep the hood closed
and contact the fire department.
Checking coolant level
Checking the coolant level (example)
XPark the vehicle on alevel surface. Only check the coolant level when the vehicle
is on alevel surface and the engine has cooled
down.
XTurn the SmartKey to position 2in the igni-
tion lock (Ypage 104).
XCheck the coolant temperature display in the
instrument cluster.
The coolant temperature must be below
158 ‡(70 †).
XSlowlyt urn cap :half aturn counter-clock-
wise and allow excess pressure to escape.
XTurn cap :further counter-clockwise and
remove it.
If the coolant is at the level of marker bar =
in the fillern eck when cold, there is enough
coolant in coolant expansion tank ;.
If the coolant level is approximately 0.6 in
(1.5 cm) above marker bar =in the fillern eck
when warm, there is enough coolant in cool-
ant expansion tank ;.
XIf necessary,add coolant that has been tested
and approved by Mercedes-Benz.
XReplace cap :and turn it clockwise as far as
it willg o.
For further information on coolant, see
(
Ypage 279).
Adding washe rfluid to the windshield
washe rsystem/headlamp cleaning
system
GWARNING
Windshield washer concentrate could ignite if it comes into contact with hot engine compo-
nents or the exhaust system. There is arisk of
fire and injury.
Make sure that no windshield washer con-
centrate is spilled next to the fillern eck.
Engine compartment229
Maintenanceand care
Z

Filling capacities
The followingvalue srefer to an oil chang e
includin gthe oil filter.
ModelCapacit y
G5502.4USg al(9.0 l)
Mercedes-AMG G632.25 US gal
(8.5 l)
Mercedes-AMG G652.77 US gal
(10.5 l)
Additives
!Do not us eany additive sinthe engine oil.
Thisc ould damag ethe engine.
Brake fluid
GWARNING
The brake fluid constantly absorbsm oisture
from the air. Thisl owersthe boiling point of
the brake fluid .Ifthe boiling point of the brake
fluid is too low, vapor pockets may form in the
brake system when the brakes are applied
hard. Thisw ouldimpai rbraking efficiency.
There is ariskofana ccident.
Yo us houl dhavet he brake fluid renewe dat
the specified intervals.
Whe nhandling brake fluid ,observe the impor-
tant safety notes on service products
(
Ypage 276).
Only us ebrake fluid approved by Mercedes-
Benz in accordance with MB-Freigab eorMB-
Approval3 31.0.
Information abouta pproved brake fluid can be
obtaine datany qualified specialist workshopo r
on the Interneta t
http://bevo.mercedes-benz.co m.
iHave the brake fluid regularly replaced at a
qualified specialist workshop in accordance
with the replacement intervals and the
replacement confirmed in the service report.
Coolant
Importan tsafety notes
GWARNING
If antifreeze comes into contact with hot com- ponents in the engine compartment, it may
ignite. There is arisk of fire and injury.
Let the engine cool downb efore youadd anti-
freeze.M ake surethat antifreeze is not spilled
next to the filler neck. Thoroughly clea nthe
antifreeze from components before starting
the engine.
!Only ad dcoolant that has beenp remixed
with the desire dantifreeze protection. You
coul dotherwise damag ethe engine.
Furthe rinformatio noncoolants 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 aqualifie dspecialist workshop.
!Always use asuitabl ecoolant mixture, even
in countries where hig htemperatures 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 service report.
Comply with the important safety precautions
for service products whe nhandling coolant
(
Ypage 276).
The coolant is amixture of water and anti-
freeze/corrosion inhibitor. It performs the fol-
lowing tasks:
RAnti-corrosion protection
RAntifreeze protection
RRaising the boiling point
If the coolant has antifreeze protection downt o
-35 ‡(-37 †), th eboilin gpoint of th ecoolan tin
th ep ressurize dsyste misa pproximately 26 6‡
(130 †).
Service pr oduct sand filling capacities279
Technical data
Z

The antifreeze/corrosion inhibitor concentra-
tion in the engine cooling system should:
Rbe at least 50%. This will protectthe engine
cooling system against freezin gdown to
approximately -35 ‡(-37 †).
Rnot exceed 55% (antifreez eprotection down
to -49 ‡[-45 †]). Otherwise, heat will not be
dissipated as effectively.
Mercedes-Benz recommends an antifreeze/
corrosion inhibitor in accordanc ewith MB Spec-
ifications for ServiceP roducts 310.1.
iWhen the vehicle is first delivered, it is filled
with acoolant mixture that ensures adequate
antifreeze and anti-corrosion protection.
iThe coolant is checked at specified intervals
at aq ualified specialist workshop.
The engine cooling system is filled with coolant
at the factor ywhich contains antifreeze/corro-
sion inhibitor that ensures protection down to
approximately -35 ‡(-37 †).
Capacity
Missing values were not availableatt ime of
going to print.
ModelCapacity
G5 50Approx.1 1.1 US qt
(10.5 l)
G63A MGApprox.1 4.6 US qt
(13.8 l)
G65A MG
Windshield/headlamp cleaning sys-
tem
Important safety notes
GWARNING
Windshield washer concentrate could ignite if it comes into contact with hot engine compo-
nentsort he exhaust system. There is arisk of
fire and injury.
Make sure that no windshield washer con-
centrate is spilled next to the filler neck.
!Do not add distilled or de-ionized water to
the washer fluid container. Otherwise, the
level sensor may be damaged.
!Only MB SummerFit and MB WinterFit
washer fluid should be mixed together. The
spray nozzles may otherwise become
blocked.
Do not use distilled or de-ionized water. Other-
wise, the level sensor may give afalse reading.
When handling washer fluid, observe the impor-
tant safety notes on service products
(
Ypage 276).
At temperatures above freezing:
XFill the washer fluid reservoir with amixture of
water and windshield washer fluid, e.g. MB
SummerFit.
Add 1part MB SummerFit to 100 parts water.
At temperatures below freezing:
XFill the washer fluid reservoir with amixture of
water and washer fluid, e.g. MB WinterFit.
For the correctm ixing ratio refer to the infor-
mation on the antifreeze reservoir.
iAdd windshield washer fluid, e.g. MB Sum-
merFit or MB WinterFit, to the washer fluid all
year round.
Climate control system refrigerant
Important safety notes
The climate control system of your vehicle is fil-
led with refrigerant R‑ 134a.
The instruction label regarding the refrigerant
type used can be found on the radiator cross
member.
!Only the refrigerant R‑134a and the PAG oil
approved by Mercedes-Benz may be used.
The approved PAG oil may not be mixed with
any other PAG oil that is not approved for
R-134a refrigerant.O therwise, the climate
control system may be damaged.
Servicew ork, such as refilling with refrigerant or
replacing component parts, may only be carried
out by aqualified specialist workshop. All appli-
cable regulations must be adhered to, SAE
standard J639 included.
Always have work on the climate control system carried out at aqualified specialist workshop.
280Service products and filling capacities
Technical data