2016 MERCEDES-BENZ G-CLASS SUV coolant temperature

Display messages
Possible causes/consequence
sand M
MSolutions The poly-V-belt may have torn.
X Stop the vehicle immediately, paying attention to road and traffic
conditions, and switch off the engine.
X Check the poly-V-belt.
If the poly-V-belt is torn:
! Do not continue driving. The engine could otherwise overheat.
X Consult aqualified specialist workshop.
If the poly-V-belt is OK:
X Wait until the display message disappears before restarting the
engine. The engine may otherwise be damaged.
X Pay attention to the coolant temperature gauge.
X Consult aqualified specialist workshop. # The battery is no longer being charged.
Aw
arning tonea lso sounds.
Possible causes:
R faulty alternator
R torn poly-V-belt
R am alfunction in the electronics
X Stop the vehicle immediately, paying attention to road and traffic
conditions, and switch off the engine.
X Open the bonnet.
X Check whether the poly-V-belt is torn.
If the poly-V-belt is torn:
! Do not continue driving. The engine could otherwise overheat.
X Consult aqualified specialist workshop.
If the poly-V-belt is OK: X Consult aqualified specialist workshop. 4
Check Check
eng.
eng.oil
oillev.
lev.
when
when next
nextrefuelling
refuelling The engine oil level has dropped to the minimum level.
Aw
arning tonea lso sounds.
X Check the oil level when next refuelling, at the latest (Y page 213).
X If necessary, top up the engine oil (Y page 213).
X Have the engine checked at aqualified specialist workshop if the
engine oil needs topping up more often than usual. 8
Reserve fuel level Reserve fuel level The fuel level has dropped into the reserve range.
Operation of the auxiliary heating is deactivated if the fuel level drops
into the reserve range.
X Refuel at the nearest filling station. Display me
ssages
147On-board compute rand displays Z

Engine
Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
MSolutions ;
N
The yellow engine diagnostics warning lamp lights up whil ethe engine is run-
ning.
There may be afault with the following, for example:
R engine management
R fuel injection system
R exhaust system
R fuel system
The emission limit values may be exceeded and the engine may be runnin gin
emergenc ymode.
X Consult aqualified specialist workshop immediately.
Vehicles with adiesel engine: the fuel tank has been run dry (Y page 110).
X Start the engine three to four times after refuelling.
If the yellow engine diagnostics warning lamp goes out, emergenc ymode is
cancelled. The vehicle does not have to be checked. 8
N
The yellow reserve fuel warning lamp lights up while the engine is running.
The fuel level has dropped into the reserve range.
Operation of the auxiliary heating is deactivated if the fuel level drops into the
reserve range.
X Refuel at the nearest filling station. %
N
On diesel engine vehicles, the preglow indicator lamp does not light up when the
key is in position 2(Y page 96).
The preglow system is malfunctioning.
X Consult aqualified specialist workshop immediately. ?
N
The red coolant warning lamp lights up while the engine is running and the
coolant temperature display is at the start of the scale.
The temperature sensor for the coolant temperature gauge is malfunctioning.
The coolant temperature is no longer being monitored. The engine could be dam-
aged if the coolant temperature is too high.
X Stop the vehicle immediately,p aying attention to road and traffic conditions,
and switch off the engine. Do not continue driving.
X Secure the vehicle against rolling away (Y page 113).
X Consult aqualified specialist workshop. 162
Warning and indicator lamps on the instrument clusterOn-board computer and displays

Warning/
indicator
lamp
N N
Signa ltype
Possible causes/consequences and M
MSolutions ?
N
The red coolant warning lamp lights up while the engine is running.
The coolant level is too low.
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 not being cooled sufficiently.
X Observe the additional display messages on the multifunction display.
X Stop the vehicle immediately, paying attention to road and traffic conditions,
and switch off the engine.
X Secure the vehicle against rolling away (Y page 113).
X Leave the vehicle and keep asafe distance from the vehicle until the engine has
cooled down.
X Check the coolant level and top up the coolant, making sure to observe the
warning notes (Y page 215).
X If you have to top up the coolant frequently, have the engine cooling system
checked.
X Make sure that the air supply to the engine radiator is not blocked, e.g. by frozen
slush.
X Do not start the engine again until the coolant temperature is below 120 †. The
engine may otherwise be damaged.
X Drive to the nearest qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving in mountainous terrain
and stop-start traffic. ?
N
The red coolant warning lamp lights up while the engine is running.
The coolant temperature has exceeded 120 †. The airflow to the engine radiator may be blocked or the coolant level may be too low.
G WARNING
The engine is not being cooled sufficiently and may be damaged.
Never drive with an overheated engine. Drivin gwhen your engine has overheated
can cause any fluids that may have leaked into the engine compartment to catch fire.
In addition, steam from an overheated engine can cause serious burns, which can
occur just by opening the bonnet.
There is arisk of injury.
X Observe the additional display messages on the multifunction display.
X Stop the vehicle immediately, paying attention to road and traffic conditions,
and switch off the engine.
X Secure the vehicle against rolling away (Y page 113).
X Leave the vehicle and keep asafe distance from the vehicle until the engine has
cooled down.
X Check the coolant level and top up the coolant, making sure to observe the
warning notes (Y page 215).
X If you have to top up the coolant frequently, have the engine cooling system
checked. Warning and indicato
rlamps on the instrument cluster
163On-boardcomputer and displays Z

Warning/
indicator
lamp
N N
Signa ltype
Possible causes/consequences and M
MSolutions X
Make sure that the air supply to the engine radiator is not blocked, e.g. by frozen
slush.
X If the coolant temperature is below 120 †, you can continue driving to the
nearest qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving in mountainous terrain
and stop-start traffic. Tyres
Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
MSolutions h
N
The yellow tyre pressure monitor warning lamp (pressure loss/malfunction) is
lit.
The tyre pressure monitor has detected aloss of pressure in at least one of the
tyres.
G WARNING
Underinflated tyres pose the following risks:
R the tyres may burst, especially as the load and vehicle speed increase
R the tyres may wear excessively and/or unevenly, which may greatly impair tyre
traction
R the driving characteristics, as well as steerin gand braking, may be greatly
impaired
There is arisk of an accident.
X Stop the vehicle without making any sudden steerin gorbraking manoeuvres.
Pay attention to the traffic conditions as you do so.
X Secure the vehicle against rolling away (Y page 113).
X Observe the additional display messages on the multifunction display.
X Check the tyres and, if necessary, follow the instructions for aflat tyre
(Y page 224).
X Check the tyre pressure (Y page 239).
X If necessary, correc tthe tyre pressure. h
N
The yellow tyre pressure monitor warning lamp (pressure loss/malfunction)
flashes for approximately one minute and then remains lit.
The tyre pressure monitor is faulty.
G WARNING
The system is possibly unable to detect or register low tyre pressure.
There is arisk of an accident.
X Observe the additional display messages on the multifunction display.
X Consult aqualified specialist workshop immediately. 164
Warning and indicator lamps on the instrument clusterOn-board computer and displays

i
If the engine oils listed on the table are not
available, you may top up with the following
engine oils until the next oil change:
R MB-Freigabe or MB-Approval 229.3, 229.5
or ACEA C3
It may be used only once and the topping-up
quantity must not exceed 1.0 l.
Fillin gcapaciti es Th
ef ollowing values refer to an oil change,
including the oil filter. Model Replacement
amount G3
50dPROFESSIONAL 12.5 l
Ad
diti ves !
Do not use any additives wit
hthe engine oil.
This could damage the engine. Brake fluid
G
WARNING
The brake fluid continuously absorbs mois-
ture from the air. This results in the boiling
point of the brake fluid lowering. If the boiling
point of the brake fluid is too low, vapour
pockets may form when the brakes are sub-
jected to aheavy load. This would impair brak-
ing efficiency. There is arisk of an accident.
Have the brake flui drenewe datthe prescri-
bed intervals.
Comply with the important safety notes for ser- vice products when handling brake fluid
(Y page2 50).
Only use brake flui dapproved by Mercedes-
Benz according to MB-Freigabe or MB-Approval
331.0.
Information about approved brake flui dcan be
obtained at any qualified specialist worksho por
on the Internet at
http://bevo.mercedes-benz.com.
i Have the brake flui
dregularl yreplaced at a
qualified specialist worksho pinaccordance
with the replacement interval sand the
replacement confirmed in the service report. Coolant
Im portant safety notes G
WARNING
If antifreeze come sinto 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 you top up
the antifreeze .Make sure that antifreeze is
not spilled next to the filler neck. Thoroughly
clea nthe antifreeze from components before
starting the engine.
! Only add coolant that has been premixed
with the desired antifreeze protection. You
coul dotherwise damage the engine.
Further information on coolants can be found in the Mercedes-Benz Specifications for Ser-
vice Products, MB Specifications for Service
Products 310.1, e.g. on the Internet at
http://bevo.mercedes-benz.com .Orcontact
aq ualified specialist workshop.
! Always use
asuitable coolant mixture, even
in countries where high temperatures prevail.
Otherwise, the engine cooling system is not
sufficiently protected from corrosio nand
overheating.
i Have the coolant regularl
yreplaced at a
qualified specialist worksho pand the replace-
ment confirmed in the service report.
Comply with the important safety notes for ser- vice products when handling coolant
(Y page2 50).
The coolant is amixture of water and anti-
freeze/anti-corrosion additive. It is responsible
for the following:
R anti-corrosion protection
R antifreeze protection
R raising the boiling point
If antifreeze/corrosio ninhibitor is present in the
correct concentration, the boiling point of the
coolant willbea round 130 †. Service products and capacities
253Technical data Z

The antifreeze/corrosion inhibitor concentra-
tion in the engine cooling system should:
R be at least 50%. This will protec tthe engine
cooling system against freezin gdown to
approximately -37 †.
R not exceed 55% (antifreez eprotection down
to -45 †). Heat will otherwise not be dissipa-
ted as effectively.
Mercedes-Benz recommends an antifreeze/
corrosion inhibitor in accordanc ewith MB Spec-
ifications for Servic eProducts 310.1.
i When the vehicle is first delivered, it is filled
with acoolant mixture that ensures adequate
antifreeze and corrosion protection.
i The coolant is checked at specified intervals
at aq ualified specialist workshop. Windscreen and headlamp cleaning
system
Importants afety notes G
WARNING
If windscreen washer concentrate comes into contact with hot components of the engine or
the exhaust system, it can ignite. There is a
risk of fire and injury.
Make sure the windscreen washer concen-
trate does not come into contact with the filler neck.
! Do not use distille
dorde-ionised water in
the washer flui dreservoir. Otherwise, the
leve lsensor may be damaged.
! Only the washer fluids SummerFi
tand Win-
terFit can be mixed. Otherwise, the spraying
nozzles coul dbecome blocked.
Do not use distilledord e-ionised water.Other-
wise, the leve lsensor may give afalser eading.
When handling washer fluid, observe the impor- tant safety notes on service products
(Y page2 50).
At temperatures above freezing:
X Fill the washer flui dreservoir with amixture of
water and washer fluid, e.g. MB SummerFit.
Mix 1part MB SummerFi tto100 parts water. At temperatures belo
wfreezing:
X Fillthe washe rfluid reservoi rwitham ixture of
water and washe rfluid ,e.g.MBW interFit.
For the correct mixing ratio ,refer to the infor-
matio nont he antifreeze reservoir.
i Add washe
rfluid concentrate ,e.g.MBS um-
merFit or MB WinterFit, to the washe rfluid all
year round. Vehicl
edata General notes
Please note that for the specified vehicle data:
R the heig htss pecified may vary as aresulto f:
- tyres
- load
- condition of the suspension
- items of optional equipment
R items of optional equipment reduce the max-
imum payload
R vehicle-specific weight information can be
found on the vehicle identification plate
(Y page 249)
R onlyf or certain countries: you can find vehi-
cle-specific vehicle data in the COC docu-
ments (CERTIFICATE OF CONFORMITY).
These documents are delivered with your
vehicle. Dimensions and weights254
Vehicle dataTechnical data