2016 MERCEDES-BENZ G-CLASS SUV engine coolant

Engine
Display messages
Possible causes/consequences and
M
MSolutions +
Top up coolan
tSee
Top up coolant See
Owner's Manual Owner's Manual The coolant level is too low.
X Top up the coolant, observing the warning notes before doing so
(Y page 215).
X Have the coolant system checked at aqualified specialist workshop
if the coolant needs topping up more often than usual. ? The fan motor is faulty.
X If the coolant temperature is below 120 †, drive on to the nearest
qualified specialist workshop.
X Avoid putting the engine under heavy loads as you do so, e.g. driving
in mountainous terrain and stop-start traffic. ?
Coolant Stop vehi‐ Coolant Stop vehi‐
cle Switch engine cle Switch engine
off off The coolant is too hot.
Aw
arning tonea lso sounds.
G WARNING
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 catchf ire.
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 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 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 display message goes out and
the coolant temperature is below 120 †. The engine may otherwisebe damaged.
X Pay attention to the coolant temperature gauge.
X If the temperature increases again, consult aqualified specialist
workshop immediately.
Under normal operating conditions and with the specified coolant
level, the coolant temperature may rise to 120 †. 146
Display messagesOn-board computer and displays

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

The following cause engine failure or damage
to the exhaust system:
R Use of engine oils and oil filters that have
not been expressly approved for the service
system
R Replacement of engine oil and oil filter after
the replacement interval specified by the
service system has expired
R Use of 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. H
Environmental note
When topping up the oil, take care not to spill
any. If oil enters the soil or waterways, it is
harmful to the environment. X
Turn cap :anti-clockwise and remove it.
X Top up with the amount of engine oil required.
Observe the specification sinthe on-board com-
puter when doing so or fill carefully to the max- imum mark on the oil dipstick.
The differenc ebetween the minimum mark and
the maximum mark on the oil dipstick is approx- imately 2.0 litres.
X Replace cap :on the filler neck and turn
clockwise.
Make sure that the cap locks securely into
place.
For further information on engine oil, see
(Y page 252). Other service products
Important safety notes G
WARNING
Certain components in the engin ecompart-
ment coul dbevery hot, e.g. the engine, the
radiator and parts of the exhaust system.
There is arisk of injury when accessing the
engine compartment.
As far as possible,a llow the engine to cool
downa nd only touch the components descri-
bed in the following. G
WARNING
There are moving components in the engine
compartment. Certain components may con-
tinue to move or suddenly move again even
after the ignitio nhas been switched off, e.g.
the radiator fan. There is arisk of injury.
If you have to carry out work in the engine
compartment:
R switch off the ignition
R never touch the dangerous area ssurround-
ing moving components, e.g. the rotation
area of the fan
R remove jewellery and watches
R keep items of clothing and hair, for exam-
ple,a wayfrom moving parts. G
WARNING
The cooling system is pressurised ,particu-
larl yw hen the engine is warm .Ifyou open the
cap, you coul dbescalded if hot coolant
sprays out. There is arisk of injury.
Let the engine cool downb efore you open the
cap. Wearg lovesand eye protection. Open
the cap slowly to release the pressure. G
WARNING
If you open the bonnet while the engine is
overheating or while there is afire in the
engine compartment, you coul dcome into
contact with hot gase sorother leaking ser-
vice products. There is adange rofinjury. 214
Engine compartmentMaintenanc
eand care

Allow an overheating engine to coo
ldown
before opening the bonnet. If ther eisafirein
the engine compartment, leav ethe bonnet
closed and notify the fir ebrigade.
Checkin gthe coolant level Example: checking the coolant level
X Park the vehicl eonalevel surface.
Check the coolant level onl yifthe vehicl eis
on alevel surface and the engine ha scooled
down.
X Turn the key to position 2in the ignition lock
(Y page 96).
X Check the coolant temperatur edisplay in the
instrument cluster.
The coolant temperatur emustbeb elow
70 †.
X Slowl yturnc ap : half aturna nti-clockwise
and allo wexcess pressure to escape.
X Turn cap :furthe ranti-clockwise and
remove it.
If the coolant is at the level of marker bar =
in the fille rneck when cold, there is enough
coolant in coolant expansio ntank ;.
If the coolant level is approximately 1.5 cm
above marker bar =in the fille rneck when
warm, there is enoug hcoolant in coolant
expansio ntank ;.
X If necessary ,top up with coolant tha thas
been teste dand approved by Mercedes-Benz.
X Replace cap :and tur nitclockwise as fa ras
it will go.
Furthe rinformatio noncoolant (Y page 253). Topping up the windscreen washe
rsys-
tem/headlamp cleanin gsystem G
WARNING
If wind screen 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. Example: topping up the windscreen washer
system
X To open: pull cap:upwards by the tab and
open.
X Top up with the premixed washe rfluid.
X To close: press cap :onto the fille rneck
unti lite ngages.
The washe rfluid reservoi risusedf or both the
windscree nwashe rs ystem and the headlamp
cleaning system.
If the washe rfluid level drops belo wthe recom-
mended minimu mof3.5 litres ,amessage
appear sinthe multifunctio ndisplay prompting
yo utot op up the washe rfluid (Y page 154).
Furthe rinformatio nonwashe rfluid
(Y page 254). Service
ASSYST service interval display
Service messages Yo
uc an obtain up-to-dat einformation concern-
ing the servicin gofyour vehicle from aqualified
specialis tworkshop, e.g. aMercedes-Ben zSer-
vice Centre. Service
215Maintenance and care Z

Vehicl
eidentificatio nnumber (VIN) :
VIN
The VIN can alsobef ound on the vehicle iden-
tification plate (Y page 249).
For certain countries only: the VIN can also be
found on the lower edge of the windscreen. Engine number
The engine number is stampe dintot he crank-
case. You can obtain further informatio nfrom
any qualified specialist workshop. Service products and capacities
Important safety notes
G
WARNING
Servic eproduct can be poisonous and haz-
ardous to health. There is arisk of injury.
Observe the instructions on the respective
original container when using, storing and dis- posing off service products. Always store ser-
vice products in the sealed original container. Always keep service products out of the reach
of children. H
Environmental note
Dispose of service products in an environ-
mentally -responsible manner.
Servic eproduct sinclude th efollowing:
R fuels
R exhaust gas aftertreatmen tadditive, e.g.
AdBlue ®
R lubricant s(e.g .engine oil, transmission oil) R
coolant
R brake fluid
R windscreen washer fluid
R climat econtrol system refrigerant
Components and service products mus tbe
matched. Use only products recommended by
Mercedes-Benz. Damage caused by the us eof
products that have not bee nrecommended is
not covered by the Mercedes-Benz warranty or
goodwil lgestures. The yare listed in this
Mercedes-Benz Owner's Manua linthe appro-
priate section.
You can identify service products approved by
Mercedes-Benz by the following inscriptions on
the container:
R MB-Freigabe (e. g. MB-Freigabe 229.51)
R MB Approva l(e. g. MB Approva l229.51)
Other designations or recommendations indi-
cate alevel of quality or aspecification in
accordance with an MB Shee tNumber (e.g .MB
229.5). The yhaven ot necessaril ybeen
approved by Mercedes-Benz.
Other designations ,for example:
R 0W-30
R 5W-30
R 5W-40
You can obtain further information at any quali-
fie ds pecialist worksho poronthe Internet at
http://bevo.mercedes-benz.com. Fuel
Important safety notes G
WARNING
Fuel is highly flammable .Ifyou handl efuel
incorrectly ,there is arisk of fire and explo-
sion.
You must avoi dfire, naked flames, creating
sparks and smoking. Switch off the engine
and, if applicable,t he auxiliary heating before
refuelling. G
WARNING
Fuel sare poisonous and hazardous to health.
There is adange rofinjury.
Do not swallowf uel or let it come into contact
with skin, eyesorc lothing. Do not inhal efuel 250
Service products and capacitiesTechnical data