2015 MERCEDES-BENZ G-Class engine coolant

Displays and operation
Instrument cluster
Instrument cluster: miles
:
Speedometer with segments (Y page 198)
; Multifunction display (Y page 199)
= Tachometer (Y page 198)
? Coolant temperature (Y page 197)
A Fuel gage
B Instrument cluster lighting (Y page 197)Instrument cluster lighting
The brightness control knob is located on the bottom left of the instrument cluster
(Y page 197).
X Turn the brightness control knob clockwise
or counter-clockwise.
If the light switch is set to Ã,Tor
L, the brightness is dependent upon
the brightness of the ambient light.
i The light sensor in the instrument cluster
automatically controls the brightness of
the multifunction display.
In daylight, the displays in the instrument
cluster are not illuminated. Displaying the coolant temperature
G
WARNING
Driving when your engine is overheated can
cause some fluids which may have leaked into the engine compartment to catch fire. You
could be seriously burned.
Steam from an overheated engine can cause
serious burns which can occur just by opening
the engine hood. Stay away from the engine if you see or hear steam coming from it.
Stop the vehicle in a safe location away from
other traffic. Turn off the engine, get out of the
vehicle and do not stand near the vehicle until
the engine has cooled down.
! A display message is shown if the coolant
temperature is too high. Displays and ope
ration
197On-board computer and displays Z

If the coolant temperature is over 248 ‡
(120 †), do not continue driving. The
engine will otherwise be damaged.
The coolant temperature gage is in the instru- ment cluster on the right-hand side
(Y page 197).
Under normal operating conditions and with
the specified coolant level, the coolant tem-
perature may rise to 248 ‡ (120 †). Tachometer
! Do not drive in the overrevving range, as
this could damage the engine.
The red band in the tachometer indicates the engine's overrevving range.
The fuel supply is interrupted to protect the
engine when the red band is reached. Outside temperature display
You should pay special attention to road con-
ditions when temperatures are around freez-
ing point.
Bear in mind that the outside temperature
display indicates the temperature measured
and does not record the road temperature.
The outside temperature display is in the mul- tifunction display (Y page 199).
Changes in the outside temperature are dis-
played after a short delay. Speedometer with segments
The segments in the speedometer indicate
which speed range is available.
R Cruise control activated (Y page 162):
The segments light up from the stored
speed to the maximum speed.
R Variable SPEEDTRONIC activated
(Y page 166):
The segments light up from the start of the
scale to the selected limit speed.
R DISTRONIC PLUS activated (Y page 171):One or two segments in the set speed
range light up.
R DISTRONIC PLUS detects a vehicle in front:
The segments between the speed of the
vehicle in front and the stored speed light
up. Operating the on-board computer
Overview :
Multifunction display
; Switches on the Voice Control System;
see the separate operating instructions
= Right control panel
? Left control panel
A Back button
X To activate the on-board computer: turn
the SmartKey to position 1(Y page 133) in
the ignition lock.
You can control the multifunction display and
the settings in the on-board computer using
the buttons on the multifunction steering
wheel. 198
Displays and operationOn-board computer and displays

Further information on the EASY-ENTRY/EXIT
feature (Y page 92).
Switching the fold-in mirrors when lock-
ing feature on/off
When you activate the Auto.
Auto. Mirror Mirror Fold‐
Fold‐
ing
ing function, the exterior mirrors are folded
in when the vehicle is locked. If you unlock the vehicle and then open a door, the exterior
mirrors fold out again.
X Press the =or; button on the steer-
ing wheel to select the Sett.
Sett. menu.
X Press the :or9 button to select the
Convenience
Convenience submenu.
X Press ato confirm.
X Press :or9 to select the Auto. Auto.
Mirror Folding
Mirror Folding function.
If the Auto. Mirror Folding
Auto. Mirror Folding function is
activated, the vehicle's exterior mirror is
displayed in red in the multifunction dis-
play.
X Press the abutton to save the setting. :
To fold the exterior mirrors in or out
If you have switched the Auto. Mirror
Auto. Mirror
Folding
Folding on and you fold the exterior mirrors
in using button :, they will not fold out auto-
matically (Y page 93).
You can then only fold out the exterior mirrors
using button :. Restoring the factory settings
X Press the =or; button on the steer-
ing wheel to select the Sett. Sett.menu.
X Press the :or9 button to select the
Factory Setting Factory Setting submenu.
X Press ato confirm.
The Reset All Settings?
Reset All Settings? message
appears.
X Press the :or9 button to select No
No
or Yes
Yes.
X Press ato confirm the selection.
If you select Yes Yes, the multifunction display
shows a confirmation message.
For safety reasons, the Daytime Running Daytime Running
Lights
Lights function in the Lights
Lightssubmenu is
only reset if the vehicle is stationary. AMG menu in AMG vehicles
AMG displays :
Digital speedometer
; Gear indicator
= Upshift indicator
? Engine oil temperature
A Coolant temperature
B Status indicator for ECO start/stop func-
tion (Y page 135)
X Press =or; on the steering wheel
to select the AMG
AMGmenu.
Upshift indicator UP
UP= indicates that the
engine has reached the overrevving range
when in the manual gearshift program.
Upshift indicator UP UP= fades out other mes-
sages until you have shifted up.
If the engine oil temperature is below 176 ‡
(80 †), the oil temperature is shown in blue. Menus and submenus
209On-board computer and displays Z

Display messages
Possible causes/consequences and
M
MSolutions b
Check Check
Left
LeftDaytime
Daytime
Running
Running
Lamp Lampor Check Right
Check Right
Daytime Running
Daytime Running
Lamp Lamp The left or right-hand daytime running lamp is defective.
X Visit a qualified specialist workshop. b
Malfunction. See Malfunction. See
Operator's Manual Operator's Manual The exterior lighting is defective.
X Visit a qualified specialist workshop. b
Auto Auto
Lamp
LampFunction
Function
Inoperative
Inoperative The light sensor is defective.
X Visit a qualified specialist workshop. b
Switch Off Lights Switch Off Lights The lights are still switched on when you leave the vehicle. A
warning tone also sounds.
X Turn the light switch to Ã.Engine
Display messages
Possible causes/consequences and
M MSolutions +
Check Coolant Check Coolant
Level. See Opera‐ Level. See Opera‐
tor's Manual tor's Manual The coolant level is too low.
X Add coolant, observing the warning notes before doing so
(Y page 278).
X Have the coolant system checked at a qualified specialist work-
shop if the coolant needs topping up more often than usual. ? The fan motor is faulty.
X At coolant temperatures below 248 ‡ (120 †), 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. Display
messages
221On-board computer and displays Z

Display messages
Possible causes/consequences and
M
MSolutions ?
Coolant Too Hot Coolant Too Hot
Stop Vehicle Stop Vehicle
Switch Engine Off Switch Engine Off The coolant is too hot.
A warning tone also sounds.
G WARNING
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.
X Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 150).
X Leave the vehicle and keep a safe 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 snow, slush or ice.
X Do not start the engine again until the display message goes out
and the coolant temperature is below 248 ‡ (120 †). Other-
wise, the engine could be damaged.
X Pay attention to the coolant temperature display.
X If the temperature increases again, visit a qualified specialist
workshop immediately.
Under normal operating conditions and with the specified coolant
level, the coolant temperature may rise to 248 ‡ (120 †). The poly-V-belt may have torn.
X Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Check the poly-V-belt.
If the poly-V-belt is torn:
! Do not continue driving. The engine could otherwise overheat.
X Consult a qualified specialist workshop.
If the poly-V-belt is not damaged:
X Wait until the display message disappears before restarting the
engine. Otherwise, the engine could be damaged.
X Pay attention to the coolant temperature display.
X Visit a qualified specialist workshop. 222
Display
messagesOn-board computer and displays

Display messages
Possible causes/consequences and
M
MSolutions Telephone No Ser‐
Telephone No Ser‐
vice vice Your vehicle is outside the network provider's transmitter/
receiver range.
X Wait until the mobile phone operational readiness symbol
appears in the multifunction display. ¥
Check Washer Fluid Check Washer Fluid The washer fluid level in the washer fluid reservoir has dropped
below the minimum.
X Add washer fluid (Y page 278).SmartKey
Display messages
Possible causes/consequences and
M MSolutions Â
Key Does Not Key Does Not
Belong to Vehicle Belong to Vehicle You have put the wrong SmartKey in the ignition lock.
X Use the correct SmartKey. Â
Take Take
Your
YourKey
Keyfrom
from
Ignition
Ignition The SmartKey is in the ignition lock.
X Remove the SmartKey. Â
Obtain a New Key Obtain a New Key The SmartKey needs to be replaced.
X Visit a qualified specialist workshop. Warning and indicator lamps in the
instrument cluster Overview of warning and indicator
lamps
L Low-beam headlamps (Y page 99)
#
! Turn signal (Y
page 103)
K High-beam headlamps
(Ypage 103)
N Front fog lamps (Y page 101)
R Rear fog lamp (Y page 101)
ü Seat belts (Y page 235)
$
(USA) Braking (Y
page 236) J
(Can-
ada)
Brakes (yellow) (Y
page 236)
! ABS (Ypage 237)
÷ ESP®
(Y page 239)
å ESP®
OFF (Y page 239)
6 Restraint system (Y page 242)
; Check engine (Y page 243)
8 Reserve fuel (Y page 243)
? Coolant (Y page 243)
· Distance warning signal
(Ypage 245)
h Tire pressure monitor
(Ypage 246) 234
Wa
rning and indi cator lamps in the instrument clusterOn-board computer and displays

Engine
Problem
Possible causes/consequences and
M
MSolutions ;
The yellow Check
Engine warning lamp
lights up while the
engine is running.
There may be a malfunction, for example:
R in the engine management
R in the fuel injection system
R in the exhaust system
R in the ignition system
R in the fuel system
The emission limit values may be exceeded and the engine may be
in emergency mode.
X Have the vehicle checked as soon as possible at a qualified
specialist workshop.
i In some states, you must immediately visit a qualified special-
ist workshop as soon as the yellow Check Engine warning lamp
lights up. This is due to the legal requirements in effect in these
states. If in doubt, check whether such legal regulations apply in the state in which you are currently driving. 8
The yellow reserve fuel
warning lamp lights up
while the engine is run-
ning.
The fuel level has dropped into the reserve range.
X Refuel at the nearest gas station. 8
The yellow reserve fuel
warning lamp flashes
while the vehicle is in
motion.
In addition, the
;
Check Engine warning
lamp may light up. The fuel system pressure is too low. The fuel filler cap is not closed
correctly or the fuel system is leaking.
X Check that the fuel filler cap is correctly closed.
X If the fuel filler cap is not correctly closed: close the fuel filler
cap.
X If the fuel filler cap is closed: visit a qualified specialist work-
shop. ?
The red coolant warn-
ing lamp lights up while
the engine is running
and the coolant tem-
perature gage is at the
start of the scale. The temperature sensor for the coolant temperature gage is defec-
tive.
The coolant temperature is no longer being monitored. There is a risk of engine damage if the coolant temperature is too high.
X Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions. Do not continue
driving under any circumstances.
X Apply the parking brake.
X Consult a qualified specialist workshop. Warning and indicator lamps in the instrument cluster
243On-board computer and displays Z

Problem
Possible causes/consequences and
M
MSolutions ?
The red coolant warn-
ing lamp comes on
while the engine is run-
ning.
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 malfunc-
tioning.
The coolant is too hot and the engine is no longer being cooled
sufficiently.
X Observe the additional display messages in the multifunction
display.
X Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Apply the parking brake.
X Leave the vehicle and keep a safe distance from the vehicle until
the engine has cooled down.
X Check the coolant level and add coolant, observing the warning
notes (Y page 278).
X If you need to add coolant more often than usual, have the
engine coolant system checked.
X Make sure that the air supply to the engine radiator is not
blocked, e.g. by snow, slush or ice.
X Do not start the engine again until the coolant temperature is
below 248 ‡(120 †). Otherwise, the engine could be damaged.
X Drive to the nearest qualified specialist workshop.
X Avoid subjecting the engine to heavy loads, e.g. driving in moun-
tainous terrain, and stop-start driving. ?
The red coolant warn-
ing lamp comes on
while the engine is run-
ning. A warning tone
also sounds. The coolant temperature has exceeded 248 ‡ (120 †). The air-
flow 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.
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. 244
Warning and indicator lamps in the instrument clusterOn-board computer and displays