engine coolant MERCEDES-BENZ E-CLASS CABRIOLET 2020 User Guide

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
If th e trailer hitch is swivelling: #
Wait until the ball neck has reached the operational position.
Ù
Po we rst eering warning
lamp (red) The
red po werst eering sy stem warning lamp is lit while the engine is running.
*The po wer assi stance or thesteering itself is malfunctioning. &
WARNING Risk of accident if steering capability is impaired
If th esteering does not function as intended, theve hicle's operating saf ety is jeopardised. #
Pull over and stop theve hicle safely as soon as possible, paying attention toroad and traf fic conditions. Do
not continue driving under any circums tances. #
Consult a qualified specialist workshop. #
Notethe messages on the multifunction displa y.Engine
Wa
rning/indicator lamp
Possible causes/consequences and M MSolutions
ÿ Coolant warning lamp The
red coolant warning lamp is lit while the engine is running.
*Possible causes: R The temp erature sensor is malfunctioning 41 8
Displaymessa ges and warning/indicator lamps

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
R The coolant le vel is too low
R The air supply tothera diator is obstructed
R The radiator fan is faulty
If th ere is an additional warning tone, the coolant temp erature has exceeded 120 °C. &
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. #
Stop theve hicle immediately in accordance with the traf fic conditions and switch off the engine. Do not continue
driving. #
Notethe messages on the multifunction displa y.
If th e coolant temp erature display is at the lo wer end of thete mp erature scale: #
Consult a qualified specialist workshop.
or #
Exit theve hicle and keep a safe dis tance from it until the engine has cooled down. #
Check the coolant le vel (/ page 293). Display messages and
warning/indicator lamps 419

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions #
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.
; Engine diagnosis warning
lamp The
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 eme rgency 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. #
Start the engine thre eto four times af terre fuelling.
If th eye llow engine diagnosis warning lamp goes out, emer gency operation mode is cancelled. The vehicle need
not be checked.
#
Elect rical fault warning
lamp The
red elect rical fault warning lamp is lit.
*T here is a fault in the electrics. #
Notethe messages on the multifunction displa y.420
Display messages and warning/indicator lamps

Cleaning
see Care
Climate control ........................................ 13 9
Ac tivating/deactivating the A/C
function (cont rol panel) ...................... .140
Ac tivating/deactivating the A/C
function (MBUX multimedia sy stem) ... 14 0
Ac tivating/deactivating the synchro‐
nisation function (cont rol panel) .......... 141
Ac tivating/deactivating the synchro‐
nisation function (MBUX multimedia
sy stem) ................................................ 141
Air-reci rculation mode ........................ .142
Au tomatic control ................................ 141
Calling up the air conditioning menu ... 14 0
Climate style function .......................... 141
Demi sting the windscreen ...................1 39
Demisting wind ows............................. 14 2
Fr ont air vents ..................................... 147
Inserting/removing theflacon (fra‐
gr ance sy stem) .................................... 14 2
Ionisation ............................................. 14 2
No te .................................................... 13 9
Re ar air vents ...................................... 14 8
Re sidual heat ....................................... 14 2Setting (MBUX multimedia sy
stem) ..... 14 0
Setting the air distribution ...................1 39
Setting the air flow ............................... 13 9
Setting the climate style ......................1 41
Setting the fragrance sy stem ............... 14 2
Setting thete mp erature ......................1 39
St ationary heater/ ventilation .............. 14 3
Switching on/off ................................. 14 0
Switching there ar wind owheater
on/off .................................................1 39
THERMATIC control panel .................... 13 9
THERMOTRONIC contro l panel ............13 9
Ve ntilating theve hicle (con venience
opening) ................................................ 91
Climate style
Fu nction ............................................... 141
Setting ................................................. 141
Cockpit ........................................................ .6
Overview .................................................6
Cof fee cup symbol
see ATTENTION ASSIST
Combination switch ................................124
Compu ter
see On-board computer Consum
ption indicator
Calling up ............................................ 16 4
Con venience closing ................................. 91
Con venience opening ................................ 91
Coolant (engine) Check le vel .......................................... 293
No tes .................................................. 353
Cooling see Climate control
Co pyright ...................................................34
Cornering light ........................................ .125
Cross Traf fic Alert .................................. .224
Crosswind Assist Function/no tes ................................... 185
Cruise control .......................................... 191
Ac tivating ............................................ 19 2
Buttons ................................................ 19 2
Calling up a speed .............................. .192
Deactivating ........................................ 19 2
Fu nction ............................................... 191
Re quirements ...................................... 19 2
Selecting ............................................. 19 2
Setting a speed ................................... 19 2 Index
435

:
Active Light Sy stem inopera‐
tive ...................................................... 368
¯ AdBlue sy stem fault Emer. op.:
max. XXX km/h Start not poss. in
XXX km ................................................ 411
¯ AdBlue sy stem fault Emer‐
ge ncy op. in XXX miles See Owner's
Manual ................................................. 411
¯ AdBlue sy stem fault Engine
st art not possible ................................ .412
¯ AdBlue sy stem fault See Own‐
er's Manual .......................................... 411
5 Add 1 litre engine oil when
next refuelling ...................................... 413
é ATTENTION ASSIST inoperative
.............................................................3 92
é ATTENTION ASSIS T:Take a
break! .................................................. 392
: Automatic driving lights inoper‐
ative .................................................... 367 Á
Change key bat teries ................. 363
J Check brake fluid le vel.............. .384
# Check brake pads See Owner's
Manual ................................................ 384
5 Check eng. oil le v.when next
re fuelling .............................................. 412
ï Check trailer hit chlock .............. 371
h Check tyre(s) .............................. 406
! Clean the fuel filter .................... .377
J Close boot separator .................. 366
ÿ Coolant Stop vehicle Switch
engine off ............................................ 376
_ Currently una vailable Camera
view restricted ..................................... 396
ç Currently unavailable Radar
sensors dirty .......................................3 95
! currently una vailable See Own‐
er's Manual ........................................ .397
÷ currently una vailable See Own‐
er's Manual ........................................ .398 5
Engine oil le vel cannot be
measured ............................................ .414
5 Engine oil le velRe duce oil le vel.. 413
5 Engine oil le velSt op vehicle
Switch engine off ................................. 413
5 Engine oil pressu reStop
Switch off engine ................................. 414
ä Fault Drive at max. 80 km/h ...... 389
6 Front left malfunction Consult
wo rkshop (e xample)............................ 360
_ Front left seat backrest not
loc ked (e xamp le).................................. 374
& inoperative Battery low ..............370
& inoperative Refuel vehicle ..........3 70
& inoperative See Owner's Man. ...370
! inoperative See Owner's Man‐
ual ....................................................... 398
÷ inoperative See Owner's Man‐
ual ....................................................... 399 Index
437

T
inoperative See Owner's Man‐
ual ....................................................... 400
G Inoperati ve................................. 401
: Intelligent Light Sy stem inoper‐
ative ....................................................3 68
Á Key not de tected (red displ ay
messa ge).............................................3 64
Á Key not de tected (white displ ay
messa ge).............................................3 64
: Left dipped beam (e xamp le) ...... .367
6 Left windowbag malfunction
Consult workshop (e xample).............. .360
¢ Lowe ring .................................... 390
: Malfunction See Owner's Man‐
ual ....................................................... 367
ð Maximum speed exceeded ......... 387
Ø ................................................... 41 0
ç Off..............................................3 86
ë Off.............................................. 389 K
Open/close soft top com‐
ple tely ................................................. 366
! Parking brake See Owner's
Manual ................................................ 380
É Please reduce speed .................. 391
Ý Please wait 48 V battery charg‐
ing ...................................................... .404
h Rectify tyre pressure .................. 406
Ø Refill Ad Blue See Owne r’s
Manual ................................................ 409
! Release parking brake ................ 383
¸ Replace air cleaner .....................377
À Replace key See Owner's Man‐
ual ...................................................... .363
Á Replace key ................................ 363
8 Reser vefuel le vel...................... .377
6 Restra int sys. malfunction Con‐
sult workshop ...................................... 360
# See Owner's Manual .................. 402
K Softtop lo wering ........................ 365 K
Softtop Operation only up to
60 km/h ............................................. 365
Ù Steering malfunction Incre ased
ph ysical ef fort See Owner's Manual ....372
Ù Steering malfunction Stop
immediately See Owner's Manual .......373
# Stop vehicle Lea veengine run‐
ning ..................................................... 403
# Stop vehicle See Owner's Man‐
ual .......................................................4 03
É Stop vehicle Vehicle too low .......3 90
ç suspended ................................. 386
: Switch off lights ......................... 368
: Switch on headla mps................. 368
Ø Top up AdBlue Emergency op.
in XXX miles See Owner's Manual .......41 0
+ Top up coolant See Owner ’s
Manual ................................................ 375
¥ Top up washer fluid .................... 375438
Index

Na
vigation
see Destination entry
see Map
see Route
Ne arField Communication (NFC)
Locking theve hicle (Digital Vehicle
Ke yst icke r) ............................................ 76
St arting theve hicle (Digital Vehicle
Ke yst icke r) .......................................... 15 2
Un locking theve hicle (Digital Vehicle
Ke yst icke r) ............................................ 76
Ne utral
Engaging .............................................. 16 5
Note s........................................................ 15 5
Optimised acceleration ........................ 15 5O
Occupant saf ety
see Airbag
see Automatic front passenger front
airbag shutoff
see Pets in theve hicle
see PRE-SAFE ®
(anticipatory occu‐
pant pr otection) see PRE-SAFE
®
PLUS (anticipatory
occupant pr otection plus)
see Restra int sy stem
see Seat belt
Oil see Engine oil
On-board computer ................................. 24 3
Displ aying the service due date ........... 288
Head-up display menu .........................2 46
Multifunction display ........................... 24 5
Operating ............................................ 24 3
Overview of menus .............................. 24 3
On-board diagnostics inter face
see Diagno stics connection
On-boa rdelectronics
Engine electronics .............................. .341
No tes ................................................... 341
Tw o-w ayradios .................................... 341
Online services Data storage .......................................... 33
Online services see In-Car Of fice
Open-source so ftwa re .............................. 34 Opening the bo
otlid using your foot
HANDS-FREE ACCESS .......................... .80
Operating fluids
Ad Blue ®
............................................... 350
Ad ditives (fuel) .................................... 348
Brake fluid .......................................... .353
Coolant (engine) .................................. 353
Engine oil ............................................. 351
Fu el (diesel) ......................................... 348
Fu el (petrol) ......................................... 347
No tes .................................................. 345
Wi ndsc reen washer fluid .................... .354
Operating saf ety
48 V on-boa rdelectrical sy stem ............ 22
Declaration of confo rmity (elect ro‐
magnetic compatibility) ......................... 24
Declaration of conformity (ja ck) ............ 27
Declaration of conformity (TIREFIT kit) .. 28
Declaration of conformity (wireless
ve hicle components) ............................. 24
EQ Boo st............................................... 22
Information ............................................ 22
Ope rating sy stem
see On-board computer 450
Index

Ve
nts
see Air vents
VIN ............................................................ 343
Identification plate .............................. 343
Seat ..................................................... 343
Wi ndsc reen ......................................... 343
Vi sion
Demisting windo ws............................. 14 2W
Wa rning lamps
see Warning/indicator lamps
Wa rning sy stem
see ATA (anti-theft alarm sy stem)
Wa rning triangle
Re moving ............................................ 304
Setting up ............................................ 305
Wa rning/indicator lamp
! ABSwarning lamp ...................... 424
J Brake sy stem warning lamp
(red) .................................................... 422 J
Brake sy stem warning lamp
(yellow) ................................................ 422
ÿ Coolant warning lamp ................ .418
! Electric pa rking brake indicator
lamp (red) ............................................ 421
# Electrical fault warning lamp ...... 420
; Engine diagnosis warning lamp .. 420
å ESP®
OFF warning lamp ............ .426
÷ ESP®
wa rning lamp flashes ........ 425
÷ ESP®
wa rning lamp lights up ...... 425
8 Fuelreser vewarning lamp
lights up .............................................. .421
Ù Powe rst eering warning lamp
(red) .................................................... .418
6 Restra int sy stem warning lamp .. .416
ü Seat belt warning lamp flashes .. .416
ü Seat belt warning lamp lights
up ........................................................ 417
ä Suspension warning lamp (yel‐
low) .................................................... .424 !
The electric parking brake (yel‐
low) indicator lamp .............................. 421
ï Trailer tow hit chwarning lamp .... 417
h Tyre pressure monitoring sys‐
te m wa rning lamp flashes .................. .427
h Tyre pressure monitoring sys‐
te m wa rning lamp lights up ................ .427
L Warning lamp for dis tance
wa rning function ................................ .423
Wa rning/indicator lamps ........................41 5
Overview ..............................................4 15
PA SSENGER AIR BAG ............................ .47
Wa rranty ..................................................... 31
Wa sher fluid
see Windsc reen washer fluid
Wa shing byhand (care) .......................... 297
Wa ter tank
see Air-water duct
We ather information ............................... 263
We b br owser
Overview ..............................................2 74460
Index