coolant level MERCEDES-BENZ GLS 2017 Owners Manual

Cockpit
Overview .......................................... 33
see Instrument cluster
Collapsible spare wheel
Inflating ........................................ .3 74
see Emergency spare wheel
COMAND
Driving dynamics display ............... 221
Switching on/off ........................... 288
COMAND display
Cleaning ......................................... 329
Combination switch .......................... 113
Connecting a USB device
see also Digital Operator's Man-
ual .................................................. 287
Consumption statistics (on-board
computer) .......................................... 232
Controller ........................................... 288
Convenience closing feature .............. 87
Convenience opening feature ............ 87
Coolant (engine)
Checking the level ......................... 322
Display message ............................ 257
Filling capacity ............................... 383
Important safety notes .................. 382
Temperature (on-board computer,
Mercedes-AMG vehicles) ............... 241
Temperature gauge ........................ 230
Warning lamp ................................. 283
Cooling
see Climate control
Copyright ............................................. 32
Cornering light function
Display message ............................ 256
Crash-responsive emergency light-
ing ....................................................... 117
Crosswind Assist ................................. 69
Crosswind driving assistance ............ 69
Cruise control
Activating ....................................... 173
Activation conditions ..................... 173
Cruise control lever ....................... 172
Deactivating ................................... 173
Display message ............................ 267
Driving system ............................... 172
Function/notes ............................. 172
Important safety notes .................. 172 Storing and maintaining current
speed ............................................. 173
Cup holder
Center console .............................. 303
Important safety notes .................. 302
Rear compartm ent ......................... 303
T e
mperature controlled ................. 303
Third row of seats .......................... 304
Customer Assistance Center
(CAC) ..................................................... 29
Customer Relations Department ....... 29
D Data
see Technical data
Data carrier
Selecting ........................................ 235
Daytime running lamps
Display message ............................ 256
Function/notes ............................. 112
Switching on/off (on-board com-
puter) ............................................. 239
Declarations of conformity ................. 28
DEF
Adding ........................................... 156
Display message ............................ 260
Filling capacity ............................... 381
Important safety notes .................. 381
Diagnostics connection ...................... 29
Differential lock (display mes-
sage) ................................................... 263
Digital speedometer ......................... 233
DIRECT SELECT lever
Automatic transmission ................. 146
Display messages
ASSYST PLUS ................................ 323
Calling up (on-board computer) ..... 244
Driving systems ............................. 261
Engine ............................................ 257
General notes ................................ 243
Hiding (on-board computer) ........... 243
KEYLESS-GO .................................. 273
Lights ............................................. 256
Safety systems .............................. 245
SmartKey ....................................... 273
Tires ............................................... 268
Vehicle ........................................... 2708
Index

Problem
Possible causes/consequences and P Solutions
Vehicles with a gasoline
engine:
The engine is not running
smoothly and is misfir-
ing. There is a malfunction in the engine electronics or in a mechanical
component of the engine management system. X
Only depress the accelerator pedal slightly.
Otherwise, non-combusted fuel may get into the catalytic converter
and damage it. X
Have the cause rectified immediately at a qualified specialist work-
shop.
The coolant temperature
gage shows a value
above 248 ‡ (120 †). The coolant level is too low. The coolant is too hot and the engine is no
longer being cooled sufficiently. X
Stop as soon as possible and allow the engine and the coolant to
cool down. X
Check the coolant level ( Y
page 322). Observe the warning notes
as you do so and add coolant if necessary.
DYNAMIC SELECT controller Use the DYNAMIC SELECT controller to change
the drive program. Depending on the drive pro-
gram selected the following vehicle character-
istics will change: R
the drive (engine and transmission manage-
ment) R
the transmission R
the suspension R
the steering R
the availability of the ECO start/stop function
Each time you start the engine with the Smart-
Key or the Start/Stop button, the Comfort drive
program is activated. For further information
about starting the engine, see ( Y
page 139).
X
All vehicles (except Mercedes-AMG vehi-
cles): turn DYNAMIC SELECT controller C as many times as necessary until the desired
drive program is selected.
The selected drive program appears in the
multifunction display. After five seconds the
display goes out.
In addition, the current drive program settings
are displayed in the multimedia system dis-
play.
Drive programs available (all vehicles
except Mercedes-AMG vehicles):
Individual
Individual settings
Sport
Sporty driving characteris-
tics
Comfort
Comfortable and economi-
cal driving characteristics
Slippery
Optimal driving characteris-
tics on slippery or snow-
covered roads
Off-road
Optimal driving characteris-
tics for easily negotiable off-
road terrain
Offroad Plus
(vehicles with
Off-Road Engi-
neering pack-
age) Optimal driving characteris-
tics for rough terrainDYNAMIC SELECT controller 145
Driving and parking Z

Towing a trailer There are numerous legal requirements con-
cerning the towing of a trailer, e.g. speed restric-
tions. Make sure that your car/trailer combina-
tion complies with the local regulations: R
in your place of residence R
in the location to which you are driving
The police and local authorities can provide reli-
able information.
Observe the following when towing a trailer: R
To gain driving experience and to become
accustomed to the new handling characteris-
tics, you should practice the following in a
traffic-free location: -
cornering -
stopping -
backing up R
Before driving, check: -
trailer tow hitch -
safety switch for braked trailers -
safety chains -
electrical connections -
lights -
wheels R
Adjust the exterior mirrors to provide an
unobstructed view of the rear section of the
trailer. R
If the trailer has electronically controlled
brakes, pull away carefully. Brake manually
using the brake controller and check whether
the brakes function correctly. R
Secure any objects on the trailer to prevent
the cargo from slipping when the vehicle is in
motion. R
When you couple up a trailer, check at regular
intervals that the load is firmly secured. If the
tra i ler is equipped with trailer lights and
brakes, check the trailer to ensure that these
are working. R
Bear in mind that the handling will be less
stable when towing a trailer than when driving
without one. Avoid sudden steering move-
ments. R
The vehicle/trailer combination is heavier,
accelerates more slowly, has a decreased
gradient climbing capability and a longer
braking distance.
It is more susceptible to side winds and
requires more careful steering. R
If possible, do not brake suddenly, but instead
depress the brake pedal moderately at first so
that the trailer can activate its brakes. Then
increase the pressure on the brake pedal. R
If the automatic transmission repeatedly
shifts between gears on uphill or downhill gra-
dients, shift to a lower gear using the left-hand
steering wheel paddle shifter.
A lower gear and lower speed reduce the risk
of engine failure. R
When driving downhill, shift to a lower gear to
utilize the engine's braking effect.
Avoid continuous brake application as this
may overheat the vehicle brakes and, if instal-
led, the trailer brakes. R
If the coolant temperature increases dramat-
i cally while the air-conditioning system is
switched on, switch off the air-conditioning
system.
Coolant heat can also be dissipated by open-
ing the windows and switching the ventilation
blower and the interior temperature to the
highest level. R
When overtaking, pay particular attention to
the extended length of your vehicle/trailer
combination.
Due to the length of the vehicle/trailer com-
bination, you require additional road space in
relation to the vehicle you are overtaking
before you can change back to the original
lane.
Decoupling a trailer
G WARNING
If you uncouple a trailer with the overrun
brake engaged, you could trap your hand
between the vehicle and the trailer drawbar.
There is a risk of injury.
Do not uncouple a trailer if the overrun brake
is engaged.
G WARNING
Vehicles with level control:
The vehicle is lowered as soon as you discon-
nect the trailer cable. This could result in your
limbs or those of other people that are
between the vehicle body and tires or under-226
Towing a trailer
Driving an d parking

There is a short delay before a change in outside
temperature appears in the multifunction dis-
play.
Coolant temperature gauge
G WARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could expose you to hot gases
or other service products. There is a risk of
injury.
Let an overheated engine cool down before
opening the hood. If there is a fire in the
engine compartment, keep the hood closed
and contact the fire department.
! A display message is shown if the coolant
temperature is too high.
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 34).
Under normal operating conditions and with the
specified coolant level, the coolant temperature
may rise to 248 ‡ (120 †). Operating the on-board computer
Overview
C
Multifunction display D
Right control panel

Where possible, let the engine cool down and
touch only the components described in the
following.
G WARNING
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.
Let the engine cool down before you open the
cap. Wear gloves and eye protection. Slowly
open the cap to relieve pressure.
G WARNING
Windshield washer concentrate could ignite if
it comes into contact with hot engine compo-
nents or the exhaust system. There is a risk of
fire and injury.
Make sure that no windshield washer con-
centrate is spilled next to the filler neck.
Checking coolant level
X
Park the vehicle on a level surface.
Only check the coolant level when the vehicle
is on a level surface and the engine has cooled
down. X
Turn the SmartKey to position 2 in the ignition
lock ( Y
page 138).
On vehicles with KEYLESS-GO, press the
Start/Stop button twice ( Y
page 140).X
Check the coolant temperature gauge in the
multifunction display.
The coolant temperature must be below
158 ‡ (70 †). X
Turn the SmartKey to position 0 in the ignition
lock ( Y
page 138). X
On vehicles with KEYLESS-GO, press the
Start/Stop button ( Y
page 140).X
Press the Start/Stop button ( Y
page 140).X
Slowly turn cap C half a turn counter-clock-
wise and allow excess pressure to escape. X
Turn cap C further counter-clockwise and
remove it.
If the coolant is at the level of marker bar

Comp ly wit h the impo rtant safety notes for ser-
vice products when han dlin g coolant
( Y
page 378).
The coolant is a mixture of water and ant i-
freeze/corrosion inh ibit or. It is respon sible for
the foll owin g:R
Anti-corrosion protection R
Antifreeze protection R
Raisin g the boiling poin t
If the coolant has antifreeze protection down to
-35 ‡ (-37 †), the boilin g poin t of the coolant
during operation is appr oximately 266 ‡
(130 †).
The antifreeze concentrate /c orrosion inh ibit or
concentration in the engine co olin g system
sho uld: R
be at least 50 %. This will protect the engine
co olin g system against freezing down to
approximate ly -35 ‡ (-37 †).R
not exceed 55% (antifreeze protection down
to -49 ‡ [-45 †]). Otherwise, heat will not be
dissipat ed as effectively.
Mercedes-Benz recommen ds an antifreeze/
corrosion inh ibit or concentrate in accordance
wit h MB Spe cifications for Service Products
310.1.
i When the veh icle is first deliv ere d, it is fille d
wit h a coolant mixture that ensures adequate
antifreeze and anti-corrosion protection.
i The coolant is checked wit h every mainte-
nance interval at a qualif ied spec ialist work-
sho p.
Filling capacities Model Capacity
Mercedes ‑ AMG
vehicles Approx. 11.9 US qt
(11.3 l)
GLS 350 d 4MAT IC
Approx. 12.2 US qt
(11.5 l)
GLS 550 4MATIC
Approx. 12.0 US qt
(11.4 l)
All other mod els
Approx. 10.3 US qt
(9.7 l) Windshield washer system
Important safety notes
G WARNING
Windshield washer concentrate could ignite if
it comes into contact wit h hot engine compo-
nents or the exhaust system. There is a risk of
fire and injury.
Make sure that no windshie ld washer con-
centrate is spilled next to the filler neck.
! On ly MB SummerFit and MB WinterF it
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 a false reading.
When handling washer fluid, observe the impor-
tant safety notes on service products
( Y
page 378).
At temperatures above freezing: X
Fill the washer fluid reservoir wit h a mixture of
water and windshie ld washer fluid, e.g. MB
SummerFit.
Add 1 part MB SummerFit to 100 parts water.
At temperatures below freezing: X
Fill the washer fluid reservoir wit h a mixture of
water and washer fluid, e.g. MB WinterFit.
For the correct mixing ratio refer to the infor-
mation on the antifreeze reservoir.
i Add windshie ld washer fluid, e.g. MB Sum-
merFit or MB WinterFit, to the washer fluid all
year roun d.
Climate control system refrigerant
Important safety notes The clim ate control system of your vehicle is fil-
led wit h 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 appr oved PAG oil may not be mixed wit h
any other PAG oil that is not appr oved forService products and filling capacities 383
Technical data Z