2020 MERCEDES-BENZ GLS SUV cooling

Display messages
Possible causes/consequences and M
MSolutions #
Add coolant (/ page 362). #
Have the engine cooling sy stem checked at a qualified specialist workshop.
ÿ
Coolant Stop vehicle
Switch engine off *T
he coolant is too hot. #
Stop theve hicle immediately in accordance with the traf fic conditions and switch off the engine. &
WARNING Danger of bu rns when opening the bonn et
If yo u open the engine bonn etwhen the engine has overheated or during a fire inthe engine compartment, you
could come into contact wi thhot gases or other escaping operating fluids. #
Before opening the bonn et, allow the engine tocool down. #
Intheeve nt of a fire inthe engine compartment, keep the engine bonn etclosed and call thefire service. #
Wait until the engine has cooled down. #
Make sure that the air supply tothera diator is not obstructed. #
Avoiding high loads on the engine, drive tothe nearest qualified specialist workshop. In doing so, ensure that
th e coolant temp erature display remains below 120°C.
ÿ *T
hefan mo tor is defective. #
Avoiding high loads on the engine, drive tothe nearest qualified specialist workshop. In doing so, ensure that
th e coolant temp erature display remains below 120 °C. Displ
aymessa ges and warning/indicator lamps 451

Display messages
Possible causes/consequences and M
MSolutions #
Consult a qualified specialist workshop.
Stop vehicle Leave engine
running Wait Transmission
cooling *T
he transmission is overheating. Pulling away may be temp orarily impaired or not possible. #
Stop theve hicle immediately in accordance with the traf fic conditions. Do not continue driving. #
Lea vethe engine running. #
Wait until the display message disappears before pulling away.
Auxiliary battery malfunc-
tion *T
he auxiliary batteryforth e transmission is no longer being charge d. #
Consult a qualified specialist workshop. #
Untilthen, alw ays select park position jmanually before you swit choff the engine. #
Before leaving theve hicle, apply the electric parking brake. Brakes
Display messages
Possible causes/consequences and M MSolutions
! Parking brake See Owner's
Manual *
The yellow ! indicator lamp is lit. The elect ric pa rking brake is malfunctioning.
To appl y: #
Switch the ignition off and switch it back on. #
Apply the electric parking brake manually (/ page 222).
If it is not possible toapply the electric parking brake: Display messages and
warning/indicator lamps 455

Display messages
Possible causes/consequences and M
MSolutions
Á Please reduce speed *Y
ou are driving toofast forth e selected vehicle le vel. #
Drive more slowly and then select the desired vehicle le vel again.
Yo u are driving tooqu ickly with a trailer or the trailer hitch soc ket is being used, e.g. for a rear cycle rack. #
Read the information on trailer operation.
Á Compressor is cooling *D
uetofrequent le velch anges within a short space of time, the compressor firs t needs tocool down in order toset
th e selected vehicle le vel.
When the compressor has cooled down, theve hicle will continue rising tothe selected vehicle le vel. #
Drive on in a manner appropriate forth e cur rent le vel. Make sure that there is suf ficient ground clearance.
Cannot reach selected
level when rear fog lamp is
switched on *Y
ou cannot select off-road le vel +3. #
Swit choff there ar fog lamp.
Parking Assist and
PARKTRONIC inoperative
See Owner's Manual *
Ve hicles with Active Parking Assis t:Ac tive Parking Assist and Parking Assist PARKTRONIC are malfunctioning.
Ve hicles without Active Parking Assis t:Pa rking Assist PARKTRONIC is malfunctioning. #
Stop theve hicle in accordance with the tra ffic conditions and restart the engine. #
Ifth e display message still appears, consult a qualified specialist workshop. Display messages and
warning/indicator lamps 473

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
If th e coolant temp erature display is at the lo wer end of thete mp erature scale: #
Consult a qualified specialist workshop.
If th e coolant temp erature display is at the upper end of thete mp erature scale: #
Exit theve hicle and keep a safe dis tance from it until the engine has cooled down. #
Check the coolant le vel (/ page 362). #
Make sure that the air supply tothera diator is not obstructed. #
Avoiding high loads on the engine, drive tothe nearest qualified specialist workshop. In doing so, ensure that the
coolant temp erature display remains below 120°C.
ÿ Coolant warning lamp (yel‐
low) *T
he yellow coolant warning lamp is lit while the engine is running.
Po ssible causes:
R The temp erature sensor is malfunctioning
R The charge air, transmission oil or bat tery cooling is faulty #
Avoiding high loads on the engine, drive tothe nearest qualified specialist workshop.
;
Engine diagnosis warning
lamp *T
he yellow engine diagno stics warning lamp is lit while the engine is running.
A malfunction has occu rred in the engine, theex haust sy stem or the fuel sy stem.
The emissions limit value may ha vebeen exceeded and the engine may be running in emergency operation mode. #
Have theve hicle checked as soon as possible at a qualified specialist workshop.
Ve hicles with a diesel engine: the fuel tank may ha vebeen run dr y. 496
Display messages and warning/indicator lamps

Inserting/removing
theflacon (fra‐
gr ance sy stem)...................................... 178
Ionisation...............................................1 78
No te....................................................... 174
Re ar air vents........................................ 184
Re ar operating unit................................ 175
Re sidual heat......................................... 17 7
Re sidual heat (rear operating unit)........ 178
Setting (MBUX multimedia sy stem)....... 175
Setting the air distribution..................... 174
Setting the air flow ................................. 174
Setting the fragrance sy stem.................1 78
Setting theve hicle interior temp era‐
ture........................................................ 174
St ationary heater/ ventilation................ 180
Switching on/of f................................... 175
Switching there ar wind owheater
on/off....................................................1 74
THERMATIC contro l panel...................... 174
THERMOTRONIC contro l panel..............174
Ve ntilating theve hicle (con venience
opening).................................................. 94
Wi ndsc reen heating............................... 17 9
Coat hook .................................................. .144 Cockpit
Overview................................................... 6
Cof fee cup symbol
see ATTENTION ASSIST
Collapsible spare wheel Inflating.................................................. 411
No tes....................................................4 09
Re moving............................................... 41 0
Collision de tection (pa rked vehicle) ........ 223
Combination switch .................................. 15 8
Compu ter
see On-board computer
Consum ption indicator
Calling up.............................................. 204
Con venience closing ................................... 95
Con venience opening ..................................94
Coolant (engine) Check le vel............................................ 362
No tes..................................................... 424
Cooling see Climate control
Co pyright..................................................... 38 Cornering light
...........................................1 59
Co ver
see Roller sunblind
Cross Traf fic Alert..................................... 293
Crosswind Assist Function/no tes..................................... 228
Cruise control Activating.............................................. 235
Buttons.................................................. 235
Calling up a spee d................................. 235
Deactivating.......................................... 235
Fu nction................................................ 233
Re quirements........................................ 235
Selecting.............................................. .235
Setting a speed..................................... 235
St oring a speed.....................................2 35
Sy stem limitations................................. 233
Cup holder Switching the cooling/heating func‐
tion on/off............................................1 46
Cushionbag.................................................. 45 512
Index

¯
AdBlue sy stem fault Emer‐
ge ncy op. in XXX miles See Owner's
Manual.................................................. 487
¯ AdBlue sy stem fault Engine
st art not possible................................. .488
¯ AdBlue sy stem fault See Own‐
er's Manual .......................................... .487
5 Add 1 litre engine oil when
next refuelling....................................... 488
é ATTENTION ASSIST inoperative ....460
é ATTENTION ASSIS T:Take a
break!....................................................4 60
: Automatic driving lights inoper‐
ative...................................................... 439
Á Change key bat teries .................... 437
J Check brake fluid le vel................. 459
# Check brake pads See Owner's
Manual.................................................. 459
ï Check trailer hitch lo ck................ 443
h Check tyre(s)............................... .483 !
Clean the fuel filter ...................... 452
Á Compressor is cooling ..................473
ÿ Coolant Stop vehicle Switch
engine off..............................................4 51
_ Currently una vailable Camera
view restricted....................................... 469
ç Currently unavailable Radar
sensors dirty.........................................4 68
! currently una vailable See Own‐
er's Manual ............................................ 474
÷ currently una vailable See Own‐
er's Manual ............................................ 475
5 Engine oil le vel cannot be
measured .............................................. 490
5 Engine oil le velRe duce oil le vel.... 489
5 Engine oil le velSt op vehicle
Switch engine off.................................. 489
5 Engine oil pressure Stop
Switch off engine.................................. 490 ä
Fault Drive at max. 80 km/h
...................................................... 470, 471
ä Fault Stop.....................................4 71
6 Front left malfunction Consult
wo rkshop (e xample).............................. 434
& inoperative Battery low................ 442
& inoperative Refuel vehicle ............ 442
& inoperative See Owner's Man....... 441
! inoperative See Owner's Manual ..475
÷ inoperative See Owner's Manual ..476
T inoperative See Owner's Man‐
ual......................................................... 477
G Inoperative................................... 478
î inoperative................................... 463
: Intelligent Light Sy stem inoper‐
ative...................................................... 440
Á Key not de tected (red displ ay
messa ge)............................................... 438
Á Key not de tected (white displ ay
messa ge)............................................... 437 514
Index

Fr
ont-passenger airbag enabled See
Owner's Manual....................................4 35
Gearbox pr otection Limit 30 km/h
Switch off LOW RANGE......................... 449
Haza rdwa rning lamps malfunctioning.. .441
Limiter inoperative.................................4 61
Limiter passive ...................................... 461
LO W RANGE Malfunction...................... 448
LO W RANGE Malfunction Topar k,
apply parking brake ...............................448
LO W RANGE Max. speed 10km/h ........ 449
LO W RANGE Max. speed 40 km/h........4 49
LO W RANGE Not in drive program
"Sport".................................................. 448
LO W RANGE only when vehicle sta‐
tionary.................................................. .447
LO W RANGE Shift toposition N
brief ly.................................................... 448
LO W RANGE Shifting cancelled
Please reactivate .................................. .448 LO
W RANGE Stop Apply parking
brake..................................................... 449
Mo tor can be star ted again...................4 81
N permanently active Risk of vehicle
ro lling .................................................... 454
Only select Park (P) when vehicle is
st ationary.............................................. 453
Pa rking Assist and PARKTRONIC
inoperative See Owner's Manual ...........473
Place theke y in the mar ked space
See Owner's Manual............................. 438
PRE-SAFE impulse side inoperative
See Owner's Manual............................. 436
PRE-SAFE inoperative See Owner's
Manual..................................................4 36
Re duce speed ........................................ 485
Re versing not poss. Consult work‐
shop......................................................4 54
Risk of vehicle rolling Driver door
open and transmission not in P............. 454 Side
running board not retracted
Obse rveth eex cess width of the
ve hicle................................................... 445
Speed limit (winter tyres) XXX km/h..... 463
Speed Limit Assi stcur rently una vail‐
able See Owner's Manual ...................... 463
Speed Limit Assist inope rative.............. 463
St op vehicle Lea veengine running
Wa itTransmission cooling .....................455
To shift out of P or N,depress brake
and start engine.................................... 453
To switch off the engine, press the
St art/ Stop button for at least 3 sec‐
onds or 3 times. ................................... .450
Tr af fic Sign Assi stcur rently una vaila‐
ble See Owner's Manual ........................ 466
Tr af fic Sign Assi stinope rative ............... 466
Tr ansmission Malfunction Stop............. 454
Ty re press. monitor cur rently una vail‐
able ...................................................... .482 Index
517

Re
ar seat
Seat....................................................... 11 0
Re ar seat
see Seat
see Third rowof seats
Re ar seat belt
St atus display......................................... .44
Re ar seat belt status display ..................... 44
Re ar window
Changing the wiper blade......................1 69
Re ar window heater.................................. 174
Re ar window wipers
Ac tivating/deactivating......................... 16 5
Re ar-view mir ror
see Outside mir rors
Re cycling
see Take -ba ckof end-of-life vehicles
Re ducing agent
see AdBlue ®
Re frigerator box
Using..................................................... 15 0Re
fuelling
Re fuelling theve hicle............................. 211
To pping up AdBlue ®
............................... 215
Re gistration
Ve hicle.................................................... 33
Re mo tecont rol (stationa ryheater/
ve ntilation)
Displa ys................................................. 182
Problems............................................... 183
Re placing the battery............................ 182
Setting................................................... 181
Re mo teOnline
Charging thest ar ter battery.................. 189
Cooling or heating theve hicle interior... 189
St arting theve hicle...............................1 90
Re scue card................................................. 34
Re ser ve
Fu el....................................................... 421
Re sidual heat
Re ar operating unit................................ 178
Re stra int sy stem
Basic instructions forch ildren................ .55
Fu nction in an accident.......................... .40Fu
nctionality............................................ 39
Malfunction............................................. 40
Pr otection................................................ 39
Re duced pr otection.................................39
Self-test................................................... 39
Wa rning lamp......................................... .39
Re versege ar
Inserting................................................ 205
Re versing camera
Care..................................................... .369
Fu nction................................................ 277
Opening the camera co ver (360°
Camera)................................................ 283
Switching auto matic operation
on/off (360° Camera)........................... 283
Rims (care)................................................. 369
RO AD SUR FACE SCAN
Multifunction camera............................ 272
RO AD SUR FACE SCAN
see Camera
Ro llaw ay protection
see HOLD function Index
531