2021 MERCEDES-BENZ E-CLASS CABRIOLET engine coolant

Displa
Displa
y messag
y messag es P
es Possible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions #
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 quali/ed specialist workshop. In doing so, ensu rethat the
coolant temp erature display remains below 120°C.
ÿ *T
here is a malfunction in the engine cooling system. #
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.
8
Reserve fuel level *T
he fuel supply has dropped into there ser verange. #
Refuel.
! Clean the fuel filter *V
Vehicles wit
ehicles wit h diesel engines:
h diesel engines: the fuel /lter is dirty or thewa ter in the fuel /lter needs tobe drained. #
Consult a quali/ed specialist workshop. 390
390
Displ
aymessages and warning/indicator lamps

Ins
Ins
tr
trument displ ay
ument display Depending on
the display setting, the positions of
th e indicator lamps on the inst rument display may
di.er from theex ample shown.
Indicat
Indicat or and w
or and w ar
arning lam
ning lam ps:
ps:
6 Restraint system (/ page 431)
ü Seat belt (/ page 431)
ï Trailer hitch (/ page 432)
Ù Powe r steering (/ page 432)
ÿ Coolanttemp erature (/ page 433)
; Engine diagnostics (/ page 433)
% V
V ehicles wit
ehicles wit h a diesel engine:
h a diesel engine: preglow#
Electricalfault (/ page 433)
8 Reser vefuel wi thfuel /ller 0ap loca-
tion indicator (/ page 433)
! Electric parking brake (red)
(/page 437)
! Electric parking brake (yellow)
(/page 437)
J Brakes (yellow) (/ page 437)
J Brakes (red) (/ page 437)
L Distancewarning (/ page 439)
Ó Active Brake Assist (/ page 439)
ê Active Brake Assist (/ page 439)
ä AIR BODYCONTROL (/ page 439)
ä DYNAMIC BODY CONTROL
(/ page 439)
! ABS (/page 440)
÷ ESP®
(/ page 440)
å ESP®
OFF (/ page 440)
h Tyre pressure monitoring system
(/ page 443) T
Standing lights (/ page 125)
L Low beam (/ page 125)
K High beam (/ page 127)
#! Turn signal lights (/ page 127)
R Rear fog light (/ page 125) 430 430
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
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