2021 MERCEDES-BENZ A-CLASS SALOON coolant

Displa
Displa
y messag
y messag es P
es Possible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions
ÿ
Coolant Stop vehicle
Switch engine off *T
he coolant is too hot. #
Stop immediately in accordance with the tra1c conditions and switch o. theve hicle. &
W WARNING
ARNING Risk of burns when opening the bonnet
If yo u open the bonnet in theev ent 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. #
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. 428
428
Display messages and
warning/indicator lamps

W
W
ar
ar ning and indicat
ning and indicat or lam
or lamps
ps Ov
Ov
er
ervie
vie w of indicat
w of indicat or and w
or and war
arning lam
ning lam ps
ps Some systems will per
form a self-test when the
ve hicle is switched on. Some indicator and warn-
ing lamps may brie0y light up or 0ash. This beha v-
iour is non-critical. These indicator and warning
lamps indicate a malfunction only if they light up
or 0as haTer theve hicle has been star ted or dur-
ing a journe y.
S
S t
tandar
andar d ins
d instr
trument displ ay
ument display W
W
idescr
idescr een coc
een coc kpit ins
kpit instrtrument display
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 469)
ü Seat belt (/ page 469)
_ Reduced po wer (/ page 471)
Ú System error (/ page 471)
# Electricalfault (/ page 471)
ï Trailer hitch (/ page 472)
Ù Powe r steering (/ page 472) ÿ
V
V ehicles wit
ehicles wit h a widescr
h a widescr een coc
een coc kpit
kpit:
:
coolant temp erature (/ page 473)
; Engine diagnostics (/ page 473)
% V
Vehicles wit
ehicles wit h a diesel engine:
h a diesel engine: preglow
# Electricalfault (/ page 473)
æ Reser vefuel wi thfuel /ller 0ap loca-
tion indicator (/ page 473)
! Electric parking brake (red)
(/page 477)
! Electric parking brake (yellow)
(/page 477)
J Brakes (yellow) (/ page 477)
J Brakes (red) (/ page 477)
L Distancewarning (/ page 479)
Ó Active Brake Assist (/ page 479)
ê Active Brake Assist (/ page 479)
! ABS (/page 480)
÷ ESP®
(/ page 480)
å ESP®
OFF (/ page 480) 468 468
Display messages and
warning/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 swivelling procedu reand do not re-couple the trailer until the display message disappears. #
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
473
473

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 330). 474
474
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
475
475

Cleaning
Cleaning
see Care
Cleaning
Cleaning 0uid
0uid
see windscreen washer 0uid
Climat
Climat e contr
e contr ol
ol
Ac tivating/deactivating.......................... 148
Ac tivating/deactivating the A/C func-
tion (MBUX multimedia system).............. 148
Ac tivating/deactivating the synchro-
nisation function (control panel).............1 49
Ac tivating/deactivating the synchro-
nisation function (MBUX multimedia
system).................................................. 149
Air-recirculation mode (with /ne parti-
cle pre/lter)...........................................1 49
Au tomatic control................................. .148
Calling up the air conditioning menu....... 148
Demisting the windscreen...................... 147
Demisting windo ws................................ 149
Fr ont air vents........................................ 154
Immediate pre-entry clima tecont rol....... 152
No te...................................................... 147
Pre-entry climate control at depa rture
time.......................................................1 50
Pre-entry climate control using theke y... 150 Re
ar air vents......................................... 155
Re sidual heat......................................... 149
Setting (MBUX multimedia system)......... 148
Setting the air distribution...................... 147
Setting the air0ow.................................. 147
Setting theve hicle interior temp era-
ture....................................................... 147
St ationary heater/ ventilation................. 152
Switching the A/C function on/o.
(control panel)....................................... 148
Switching there ar wind owheater
on/o.................................................... 147
THERM ATIC cont rol panel...................... 147
THERMOTRONIC control panel............... 147
Ve ntilating theve hicle (con venience
opening).................................................. 95
Co-dr
Co-dr iv iver airbag
er airbag shut
shut o.
o.
see Automatic co-driver airbag shuto.
Coc Coc kpit kpit
Overview.............................................. 6, 10
Co.ee
Co.ee cup symbol
cup symbol
see ATTENTION ASSIST
Collision det
Collision det ection (park
ection (parked v
ed vehicle)
ehicle)
Information............................................ 212 Combination switch
Combination switch
.................................... .132
Com
Com ponent-speci/c
ponent-speci/c inf
infor
ormation
mation................... 383
Com
Com put
puter
er
see On-board computer
Conv
Conv enience closing
enience closing...................................... 96
Conv
Conv enience opening
enience opening..................................... 95
Coolant (engine)
Coolant (engine) Levelch eck............................................ 330
No tes..................................................... 393
Cooling
Cooling see Climate control
Cop
Cop yr
yright
ight....................................................... 45
Cor
Cor ner
nering light
ing light............................................. 134
Cr
Cr oss
oss tr
tr a1c
a1c (w
(war
arning)
ning)
see Manoeuvring assis tance
Cr
Cr oss
oss Tr
Tra1c
a1c Alert
Alert........................................ 264
Cr
Cr osswind Assist
osswind Assist
Fu nction/no tes...................................... 217
Cr
Cr uise contr
uise contr ol
ol
Ac tivating............................................... 224
Buttons.................................................. 224
Calling up a speed................................. 224 490 490
Index

Displa
Displa
y messag
y messag es
es
ç - - - km/h..................................... 441
È - - - km/h..................................... 441
h - - - km/h..................................... 440
# 12 V battery See Owner's Man-
ual......................................................... 456
ò Acoustic presence indicator
inoperative............................................ .415
: Active Light System inoperative..... 409
¯ AdBlue system fault Emer. op.:
max. XXX km/h Start not poss. in
XXX km.................................................. 465
¯ AdBlue system fault Emer gency
op. in XXX miles See Owner's Manual.... 464
¯ AdBlue system fault Engine
start not possible................................... 465
¯ AdBlue system fault See Own-
er's Manual............................................ 464
5 Add 1 litre engine oil when next
re fuelling ............................................... 466 é
ATTENTION ASSIST inoperati ve..... 440
é ATTENTION ASSIS T:Take a
break!.................................................... 440
: Automatic driving lights inoper-
ative...................................................... 409
Û Battery overheated Stop, every-
body out! Outdoors if possible ................ 417
û Before starting the engine, turn
th e steering wheel.................................. 424
J Brake immediately ........................ 438
Á Change key batteries .................... 406
è Charger cable connected .............. 415
J Check brake 0uid le vel.................. 439
ï Check trailer hitch lock (white
display message) .................................... 421
h Check tyre(s) ................................ 459
! Clean the fuel /lter....................... 429
ÿ Coolant Stop vehicle Switch
engine o............................................... 428 !
currently una vailable See Own-
er's Manual............................................4 51
÷ currently una vailable See Own-
er's Manual............................................4 52
5 Engine oil le vel cannot be meas-
ured....................................................... 467
5 Engine oil le velRe duce oil le vel..... 466
5 Engine oil le velSt op vehicle
Switch engine o.................................... 466
5 Engine oil pressure Stop Switch
o. engine.............................................. 467
ä Fault Drive at max. 80 km/h ......... 450
6 Front leT malfunction Consult
wo rkshop (e xample)...............................4 03
& inoperative Battery low................. 412
& inoperative Char geHV battery...... 413
& inoperati veHigh-voltage battery
ch arging inco mplete ............................... 413
& inoperative Refuel vehicle............. .413
& inoperative See Owner's Man........ 412 492 492
Index

¸
temp orarily una vailable Sensors
dirty....................................................... 448
Ú Top up AdBlue Emer gency op. in
XXX miles See Owner's Manual.............. 463
+ Top up coolant See Owner ’s
Manual.................................................. 427
¥ Top up washer 0uid...................... .426
u Towing not permitted See Own-
er's Manual ............................................ 415
d Trans. oil overheated Drive on
with care................................................ 432
! Turn on the ignition torelease
th e parking brake ................................... 438
Ú .................................................... 463
d Vehicle is operational Switch o.
ignition before exiting............................. 421
h Warning tyre defect....................... 460
h Wheel sensor(s) missing ................ 459Ú
XX,X l Top up AdBlue Swit chon
ignition, wait 60 sec. or eng. start not
poss...................................................... 464
"Electric" drive prog ram cur rently
una vailable............................................. 417
Ac tive Blind Spot Assist cur rently
una vailable See Owner's Manual ............ 446
Ac tive Blind Spot Assist inoperative........ 446
Ac tive Blind Spot Assist not available
when towing a trailer See Owner's
Manual.................................................. 447
Ac tive bonnet malfunction See Own-
er's Manual............................................ 424
Ac tive Brake Assist Functions cur-
re ntly limi ted See Owner's Manual .........454
Ac tive Brake Assist Functions limi ted
See Owner's Manual.............................. 455
Ac tive Distance Assist available again ..... 443
Ac tive Distance Assist cur rently
una vailable See Owner's Manual ............ 442Ac
tive Distance Assist inoperative.......... 442
Ac tive Lane Keeping Assist cur rently
una vailable See Owner's Manual ............ 447
Ac tive Lane Keeping Assist inoperative... 447
Ac tive Steering Assist cur rently
una vailable due tomultiple emer-
ge ncy stops........................................... 444
Ac tive Steering Assist cur rently
una vailable See Owner's Manual ............ 444
Ac tive Steering Assist inoperative...........4 44
Ad aptive Highbeam Assist cur rently
una vailable See Owner's Manual ............ 410
Ad aptive Highbeam Assist inoperative ....4 11
Ad aptive Highbeam Assist Plus cur-
re ntly una vailable See Owner's Manual ... 411
Ad aptive Highbeam Assist Plus inop-
erative.................................................. .411
Anti-theT alarm system Malfunction ....... 426
Apply brake todeselect Park (P) posi-
tion....................................................... .430 494 494
Index