engine coolant MERCEDES-BENZ E-CLASS CABRIOLET 2021 User Guide

W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions
ï
Tr ailer tow hitch warning
lamp *T
hered trailer hitch warning lamp is lit.
The trailer hitch is not operational. &
W
WARNING
ARNING Risk of an accident if the ball neck is not loc ked
The trailer may become de tach ed. #
Stop theve hicle immediately in accordance with the tra1c conditions. Do not continue driving. #
Uncouple the trailer and secure it against rolling away. #
Initiate a new swivel mo vement and do not re-couple the trailer until thewa rning/indicator lamp goes out. #
Notethe messages on the instrument displa y.Engine
Engine
W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions
ÿ
Coolant warning lamp (red) *T
he red coolant warning lamp is lit while the engine is running.
Po ssible causes:
R The temp erature sensor is malfunctioning
R The coolant le vel is too low
R The air supply tothera diator is obstructed
R The radiator fan is faulty Display message
s andwarning/indicator lamps
433
433

W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions
R The engine coolant pump is faulty
If th ere is an additional warning tone, the coolant temp erature has exceeded 120°C. &
W
WARNING
ARNING Risk of burns when opening the bonnet
If yo u open the bonnet in theeve nt of an overheated engine or /re in the engine compartment, thefo llowing situa-
tions may occur:
R You may come into contact with hot gases.
R You may come into contact with other escaping hot operating 0uids. #
Before opening the bonnet, allow the engine tocool down. #
Intheev ent of a /re in the engine compartment, keep the bonnet closed and call the /re service. #
Stop immediately in accordance with the tra1c conditions and switch o. theve hicle. Do not continue driving. #
Notethe messages on the instrument displa y.
If t If t he coolant t
he coolant t em
emper
per atur
atur e displa
e displa y is at t
y is at the low
he lower end of t
er end of t he t
he tem
emper
per atur
atur e scale:
e scale: #
Consult a quali/ed specialist workshop.
If t
If t he coolant t he coolant t em
emper
per atur
atur e displa
e displa y is at t
y is at the upper end of t
he upper end of t he t
he tem
emper
per atur
atur e scale:
e scale: #
Exit theve hicle and keep a safe distance from it until the engine has cooled down. #
Check the coolant le vel (/ page 303). 434
434
Display message
s andwarning/indicator lamps

W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions #
Make sure that the air supply tothera diator is not obstructed. #
Avoiding high loads on the engine, drive tothe nearest quali/ed specialist workshop. In doing so, ensu rethat 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 battery cooling is faulty
R The radiator shutters are bloc ked or defective #
Avoiding high loads on the engine, drive tothe nearest quali/ed specialist workshop.
; Engine diagnosis warning
lamp *T
he yellow engine diagnostics warning lamp is lit while the engine is running.
A malfunction has occur red in the engine, theex haust system or the fuel system.
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 quali/ed specialist workshop.
V
V ehicles wit
ehicles wit h a diesel engine:
h a diesel engine: the fuel tank may ha vebeen run dr y. #
Start the engine thre eto four times aTer refuelling.
If th eye llow engine diagnosis warning lamp goes out, emer gency ope ration mode is cancelled. The vehicle need not
be checked. Display messages and
warning/indicator lamps
435
435

Climate style function............................ 144
Demisting the windscreen...................... 142
Demisting windo ws................................ 145
Fr ont air vents........................................ 151
Inserting/removing the 0acon (fra-
gr ance system)...................................... 146
Ionisatio n............................................... 145
No te...................................................... 142
Re ar air vents......................................... 151
Re sidual heat......................................... 145
Setting (MBUX multimedia system)......... 143
Setting the air distribution...................... 142
Setting the air0ow.................................. 142
Setting the climate style......................... 144
Setting the frag rance system.................. 145
Setting theve hicle interior temp era-
ture....................................................... 142
St ationary heater/ ventilation................. 147
Switching there ar wind owheater
on/o.................................................... 142
THERM ATIC cont rol panel...................... 142
THERMOTRONIC control panel............... 142
Ve ntilating theve hicle (con venience
opening).................................................. 93 Climat
Climat e s e stytyle
le
Fu nction................................................ 144
Setting.................................................. .144
Co-dr
Co-dr iv
iver airbag
er airbag shut
shuto.
o.
see Automatic co-driver airbag shuto.
Coc
Coc kpit
kpit
Overview.................................................... 6
Co.ee
Co.ee cup symbol
cup symbol
see ATTENTION ASSIST
Combination switch
Combination switch .................................... .127
Com
Com ponent-speci/c
ponent-speci/c inf
infor
ormation
mation................... 355
Com
Com put
puter
er
see On-board computer
Conv
Conv enience closing
enience closing...................................... 94
Conv
Conv enience opening
enience opening..................................... 93
Coolant (engine)
Coolant (engine) Levelch eck............................................ 303
No tes..................................................... 365
Cooling
Cooling see Climate control
Cop Cop yr yright
ight....................................................... 38
Cor
Cor ner
nering light
ing light............................................. 128 Cr
Cr oss
oss tr
tra1c
a1c (w
(war
arning)
ning)
see Manoeuvring assis tance
Cr
Cr oss
oss Tr
Tra1c
a1c Alert
Alert........................................ 236
Cr
Cr osswind Assist
osswind Assist
Fu nction/no tes...................................... 187
Cr
Cr uise contr
uise contr ol
ol
Ac tivating............................................... 193
Buttons.................................................. 193
Calling up a speed................................. 193
Deactivating........................................... 193
Fu nction................................................ 192
Re quirements:....................................... 193
Selecting............................................... 193
Setting a speed...................................... 193
St oring a speed...................................... 193
System limitations.................................. 192 D D
Dashboard Dashboard see Cockpit
Dashcam Dashcam Notes..................................................... 272
Selecting a USB device......................... .273
St arting/stopping a video recording...... .273 Index
451 451

¯
AdBlue system fault Engine
start not possible................................... 426
¯ AdBlue system fault See Own-
er's Manual............................................ 425
5 Add 1 litre engine oil when next
re fuelling ............................................... 427
é ATTENTION ASSIST inoperati ve..... 399
é ATTENTION ASSIS T:Take a
break!.................................................... 399
: Automatic driving lights inoper-
ative...................................................... 379
Á Change key batteries .................... 375
J Check brake 0uid le vel.................. 398
5 Check eng. oil le v.when next
re fuelling ............................................... 427
ï Check trailer hitch lo ck(white
display message) .................................... 384
h Check tyre(s) ................................ 420
! Clean the fuel /lter....................... 390
J Close boot separator .................... 378 ÿ
Coolant Stop vehicle Switch
engine o............................................... 389
! currently una vailable See Own-
er's Manual............................................4 11
÷ currently una vailable See Own-
er's Manual............................................4 12
5 Engine oil le vel cannot be meas-
ured....................................................... 429
5 Engine oil le velRe duce oil le vel..... 428
5 Engine oil le velSt op vehicle
Switch engine o.................................... 428
5 Engine oil pressure Stop Switch
o. engine.............................................. 429
ä Fault Drive at max. 80 km/h ......... 409
6 Front leT malfunction Consult
wo rkshop (e xample)...............................3 72
_ Front leT seat backrest not
loc ked (e xamp le).................................... 387
& inoperative Battery low................. 383
& inoperative Refuel vehicle............. .383 &
inoperative See Owner's Man........ 382
! inoperative See Owner's Manual.. .412
÷ inoperative See Owner's Manual.. .413
T inoperative See Owner's Manual.. .414
G Inoperative................................... 415
: Intelligent Light System inopera-
tive........................................................ 380
Á Key being initialised Please wait.... 376
Á Key not de tected (red display
message).............................................. .376
Á Key not de tected (white display
message).............................................. .375
: LeT dipped beam (e xample).......... 379
6 LeT windowbag malfunction
Consult workshop (e xample).................. 372
¢ Lowe ring....................................... 410
: Malfunction See Owner's Man-
ual ......................................................... 379
ð Maximum speed exceeded ............ 402
Ø ................................................... .424 Index
453 453

ç
O................................................ .401
ë O.................................................3 98
K Open/close soT top comple tely.... 378
! Parking brake See Owner's
Manual..................................................3 94
É Please reduce speed .................... .410
Ý Please wait 48 V battery charg-
ing......................................................... 418
h Rectify tyre pressure ..................... 421
Ø Re/ll AdBlue See Owner ’sMan-
ual ......................................................... 424
! Release parking brake ...................397
¸ Replace air cleaner ....................... 391
Á Replace key.................................. 375
8 Reser vefuel le vel.......................... 390
6 Restraint sys. malfunction Con-
sult workshop ....................................... .372
# See Owner's Manual..................... 416
K SoTtop lo wering........................... 377 K
SoTtop Operation only up to
60 km/h................................................ 377
Ù Steering malfunction Increased
ph ysical e.ort See Owner's Manual....... 385
Ù Steering malfunction Stop
immediately See Owner's Manual ........... 386
# Stop vehicle Lea veengine run-
ning ....................................................... 417
# Stop vehicle See Owner's Man-
ual......................................................... 417
É Stop vehicle Vehicle too low .......... 409
ç suspended .................................... 400
: Switch o. lights............................ 380
: Switch on headlamps .................... 380
á temp orarily una vailable Camera
view restric ted....................................... 408
¸ temp orarily una vailable Sensors
dirty....................................................... 407
Ø Top up AdBlue Emer gency op. in
XXX miles See Owner's Manual.............. 424 +
Top up coolant See Owner ’s
Manual.................................................. 389
¥ Top up washer 0uid...................... .388
! Turn on the ignition torelease
th e parking brake ................................... 397
d Vehicle is operational Switch o.
ignition before exiting............................. 383
É Vehicle rising Please wait.............. 410
É Vehicle rising ................................ 410
h Warning tyre defect....................... 421
h Wheel sensor(s) missing ................ 420
K While stationar y,apply the
brake before operating the soT top........ 377
Ø XX,X l Top up AdBlue Swit chon
ignition, wait 60 sec. or eng. start not
poss...................................................... 425
Ac tive Blind Spot Assist cur rently
una vailable See Owner's Manual ............ 405
Ac tive Blind Spot Assist inoperative........ 406 454 454
Index

On-boar
On-boar
d electr
d electronics
onics
Engine electronics................................ .353
No tes..................................................... 353
Tw o-w ayradios...................................... 353
Online ser
Online ser vices
vices
Data storag e............................................ 37
Online ser
Online ser vices
vices
see In-Car O1ce
Open-sour
Open-sour ce
cesoTw
soTw are
are.................................... 38
Opening t
Opening t he boo
he boot lid using y
t lid using y our f
our foot
oot
HANDS-FREE ACCESS............................. 83
Oper
Oper ating
ating 0uids
0uids
Ad Blue ®
................................................ .362
Ad ditives (fuel)....................................... 360
Brake 0uid............................................. 365
Coolant (engine).................................... 365
Engine oil............................................... 363
Fu el (diesel)........................................... 361
Fu el (petrol)........................................... 359
No tes..................................................... 358
Wi ndsc reen washer 0uid........................ 366
Oper
Oper ating safe ating safe ty
ty
48 V on-board elect rical system............... 22 Declaration of conformity (electro-
magn
etic compatibility)............................ 24
Declaration of conformity (jack)............... 30
Declaration of conformity (TIREFIT kit)...... 31
Declaration of conformity (wireless
ve hicle components)................................ 24
Informatio n..................................... ......... 22
Oper
Oper ating syst ating syst em
em
see On-boa rdcomputer
Op
Op timised acceler
timised acceler ation
ation
Ac tivating............................................... 157
Outside mirr
Outside mirr ors
ors
Anti-dazzle mode (automatic)................. 139
Au tomatic mir rorfo lding function........... 141
Fo lding in/out........................................1 38
Operating the memory function.............. 114
Pa rking position..................................... 140
Setting................................................... 138
Ov Ov er
erhead contr
head contr ol panel
ol panel
Overview.................................................. 12
Owner's Manual
Owner's Manual Vehicle equipment................................... 22
Owner's Manual (digit
Owner's Manual (digit al)
al)................................. 18 P
P
P
P aint (cleaning ins
aint (cleaning ins tr
tructions)
uctions) ........................ .307
P
P aint code
aint code................................................... 356
P
P anel heating
anel heating
Setting................................................... 109
P
P ar
ar k position
k position
Engaging................................................ 168
Selecting automatically..........................1 68
P P ar
ar king
king
see Electric parking brake
P
P ar
ar king aid
king aid
see Parking Assist PARKTRONIC
P
P ar
ar king Assis
king Assist P t PARK
ARK TR
TRONIC
ONIC
Ac tivating............................................... 230
Ad justing warning tones......................... 231
Deactivating........................................... 230
Fu nction................................................ 227
System limi tations.................................. 227
P P ar
ar king assist
king assist ance syst
ance systems
ems
see Active Parking Assist
P
P ar
ar king br
king br ake
ake
see Electric parking brake 466
466
Index

W
W
ar
ar ning syst
ning syst em
em
see ATA (anti-theT alarm system)
W
W ar
ar ning tr
ning tr iangle
iangle
Re moving............................................... 315
Setting up.............................................. 316
W
W ar
ar ning/indicat
ning/indicat or lamp
or lamp
! ABSwarning lamp......................... 440
Ó Active Brake Assist warning lam p..4 39
J Brake system warning lamp (red)... 438
J Brake system warning lamp (yel-
low)....................................................... 437
ÿ Coolant warning lamp (red)........... 433
ÿ Coolant warning lamp (yellow).......4 35
! Electric parking brake indicator
lamp (red).............................................. 437
# Electrical fault warning lam p......... 436
; Engine diagnosis warning lamp...... 435
å ESP®
OFF warning lam p................ 442
÷ ESP®
wa rning lamp 0ashes........... 441
÷ ESP®
wa rning lamp lights up......... 441 8
Fuelreser vewarning lamp lights
up.......................................................... 436
Ù Powe r steering warning lamp
(red)...................................................... 432
6 Restraint system warning lam p...... 431
ü Seat belt warning lamp 0ashes...... 431
ü Seat belt warning lamp lights up.... 432
ä Suspension warning lamp (yel-
low)....................................................... 440
! The electric parking brake (yel-
low) indicator lam p................................. 437
ï Trailer tow hitch warning lam p....... 433
h Tyre pressure monitoring sys-
te m wa rning lamp 0ashes....................... 443
h Tyre pressure monitoring sys-
te m wa rning lamp lights up.................... 443
L Warning lamp for distance
wa rning function.................................... 439
Overview................................................ 429
PA SSENGER AIR BA G............................... 50 W
W arr arr anty
anty........................................................ 34
W
W asher
asher 0uid
0uid
see Windsc reen washer 0uid
W
W ashing b
ashing b y hand (car
y hand (car e)
e)................................ 307
W
W at
at er t
er t ank
ank
see Air-water duct
W
W eat
eat her inf
her inf or
ormation
mation..................................... 271
W
W eb br ow
eb br owsers
sers
Overview................................................ 284
Wheel c
Wheel c hange
hange
Fi tting a new wheel................................ 349
Lo we ring theve hicle.............................. 350
Preparation............................................ 346
Ra ising theve hicle................................. 347
Re moving a wheel................................. .349
Re moving//tting hub caps..................... 346
Wheel c
Wheel c hange hange
see Emer gency spa rewheel
Wheel rot
Wheel rotation
ation ............................................. 344
Wheels
Wheels Care..................................................... .311
Checking............................................... 336 476
476
Index