engine coolant MERCEDES-BENZ C-CLASS COUPE 2021 User Guide

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
ï Tr ailer tow hit chwarning
lamp *T
hered trailer hitch warning lamp is lit.
The trailer hitch is not operational. &
WARNING 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 traf fic 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 multifunction displa y.Engine
Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
ÿ Coolant warning lamp *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 messages and
warning/indicator lamps 491

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
R The coolant pump is faulty
If th ere is an additional warning tone, the coolant temp erature has exceeded 120°C. &
WARNING Risk of bu rns when opening the bonn et
If yo u open the bonn etwhen the engine has overheated or when there is a fire inthe engine compartment, the
fo llowing situations may occur:
R You could come into contact with hot gases.
R You could come into contact with other hot, escaping operating fluids. #
Before opening the bonn et, allow the engine tocool down. #
Intheeve nt of a fire inthe engine compartment, keep the 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.
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 368). 492
Display messages and warning/indicator lamps

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 *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 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 *T
hered elect rical fault warning lamp is lit.
There is a fault in the electrics. #
Notethe messages on the multifunction displa y. Displ
aymessa ges and warning/indicator lamps 493

Ac
tivating/deactivating the synchro‐
nisation function (cont rol panel)............ 13 6
Ac tivating/deactivating the synchro‐
nisation function (multimedia sy stem)... 13 6
Air-reci rculation mode.......................... .137
Au tomatic control.................................. 13 6
Demi sting the windscreen..................... 13 5
Demi sting windo ws............................... 13 6
Fr ont air vents....................................... 14 2
Inserting/removing theflacon (fra‐
gr ance sy stem)...................................... 137
Ionisation............................................... 137
No te...................................................... 13 5
Re ar air vents....................................... .143
Re sidual heat......................................... 137
Setting the air distribution..................... 13 5
Setting the air flow ................................. 13 5
Setting the fragrance sy stem.................1 37
Setting theve hicle interior temp era‐
ture........................................................ 13 5
St ationary heater/ ventilation................ 13 8
Switching on/of f................................... 13 5
Switching there ar wind owheater
on/off...................................................1 35
THERMATIC control pane l...................... 13 5
THERMOTRONIC contro l panel..............135 Ve
ntilating theve hicle (con venience
opening).................................................. 86
Co ckpit
Overview................................................... 6
Co ffee cup symbol
see ATTENTION ASSIST
Collision de tection (pa rked vehicle)
Information............................................ 173
COMAND Online see Multimedia sy stem
COMAND Touch
Managing devices.................................. 268
Combination switch .................................. 12 3
Compass..................................................... 301
Compu ter
see On-board computer
Connection status
Displ aying.............................................. 332
Overview............................................... 332
Contacts Calling up.............................................. .311
Del eting................................................ .312
Downloading (from mobile phone )......... 310 Importing...............................................
311
Importing (o verview)............................. .311
Information............................................ 310
Making a call......................................... 312
Na me form at......................................... .311
Options.................................................. 312
St oring................................................... 312
Controller Operating.............................................. 256
Con venience closing ................................... 86
Con venience opening ..................................86
Coolant (engine) Check le vel............................................ 368
No tes....................................................4 28
Cooling see Clima tecontrol
Co pyright..................................................... 36
Cornering light ...........................................1 24
Cross Traf fic Alert..................................... 225
Crosswind Assist Function/no tes...................................... 178 Index
509

DIRECT SELECT le
ver
Engaging drive position........................ .159
Engaging neutral................................... .158
Engaging park position.......................... 15 9
Engaging pa rkposition automatically....1 59
Engaging reve rsege ar........................... 15 8
Fu nction................................................ 157
Display (care) ............................................ .374
Display (multimedia sy stem)
Settings................................................. 263
Display (on-boa rdcompu ter)
Displ ays on the multifunction displa y.... 236
Displ aymessage
Calling up (on-board compu ter)............. 433
No tes....................................................4 33
Display messages ¯ - - - km/h ..................................... 458
ç - - - km/h ..................................... 459
È - - - km/h ..................................... 459
# 12V battery See Owner's Man‐
ual..........................................................4 74Û
48 V battery See Owner's Man‐
ual.......................................................... 476
: Active Light Sy stem inoperative... 440
¯ AdBlue sy stem fault Emer. op.:
max. XXX mphSt art not poss. in XXX
miles .................................................... .484
¯ AdBlue sy stem fault Emer‐
ge ncy op. in XXX km See Owner's
Manual.................................................. 483
¯ AdBlue sy stem fault Engine
st art not possible................................. .484
¯ AdBlue sy stem fault See Own‐
er's Manual .......................................... .483
5 Add 1 litre engine oil when
next refuelling....................................... 485
é ATTENTION ASSIST inoperative ....458
é ATTENTION ASSIS T:Take a
break!....................................................4 58
: Automatic driving lights inoper‐
ative...................................................... 439 Á
Change key bat teries .................... 437
J Check brake fluid le vel................. 456
# Check brake pads See Owner's
Manual.................................................. 457
5 Check engine oil le vel when
next refuelling....................................... 485
ï Checktrailer hitch lo ck................ 443
h Check tyre(s) ................................ 478
! Clean the fuel filter ...................... 449
ÿ Coolant Stop vehicle Switch
engine off..............................................4 48
! currently una vailable See Own‐
er's Manual .......................................... .469
÷ currently una vailable See Own‐
er's Manual .......................................... .470
5 Engine oil le vel cannot be
measured .............................................. 487
5 Engine oil le velRe duce oil le vel.... 486
5 Engine oil le velSt op vehicle
Switch engine off.................................. 486 Index
511

Head-up display menu........................... 238
Multifunction displa
y............................. 236
Ope rating.............................................. 235
Overview of menus................................ 235
On-board diagnostics in terface
see Diagnostics connection
On-board electronics Engine electronics................................. 416
No tes..................................................... 416
Tw o-w ayradios...................................... 416
Online services Data storage............................................ 35
Open-source software................................36
Opening the boot lid using your foot
HANDS-FREE ACCES S............................. 82
Ope rating fluids
Ad Blue ®
................................................ 425
Ad ditives (fuel)......................................4 23
Brake fluid............................................ .427
Coolant (engine)................................... .428
Engine oil.............................................. 426
Fu el (diesel)...........................................4 23
Fu el (petrol)........................................... 422
No tes....................................................4 20Wi
ndsc reen washer fluid...................... .429
Operating saf ety
48 V on-board electrical sy stem.............. 23
Declaration of confo rmity (elect ro‐
magnetic compatibility)........................... 25
Declaration of conformity (jack).............. 28
Declaration of conformity (TIREFIT kit).... 29
Declaration of conformity (wire less
ve hicle components)............................... 25
EQ Boost tech nology............................... 23
Information.............................................. 23
Ope rating sy stem
see On-board computer
Optimised acceleration Activating.............................................. 14 8
Outside mir rors
Anti-dazzle mode (automatic)................ 13 3
Au tomatic mir rorfo lding function......... .134
Fo lding in/out....................................... 13 2
Operating the memory function............1 08
Pa rking position..................................... 13 3
Setting................................................... 13 2
Overhead control panel Overview................................................. 14Owner's Manual
Vehicle equipment................................... 23
Owner's Manual (digital)............................ 20 P
Pa int code .................................................. .418
Pa intwork (cleaning instructions) ............371
Pa norama sliding sunroof
see Sliding sunroof
Pa rk position
Inserting................................................ 15 9
Selecting au tomatically......................... 15 9
Pa rking
see Electric parking brake
Pa rking aid
see Parking Assist PARKTRONIC
Pa rking Assist PARKTRONIC
Ac tivating.............................................. 220
Ad justing warning tones........................ 220
Deactivating.......................................... 220
Fu nctio n................................................. 217
Side impact pr otection.......................... 218
Sy stem limitations................................. 217526
Index

Vi
deo mode
Ac tivating.............................................. 340
Ac tivating/deactivating full-screen
mode..................................................... 341
Overview................................................ 341
Setting s................................................. 342
VIN Identification plate................................. 41 8
Seat....................................................... 41 8
Wi ndsc reen............................................ 41 8
Vi sion
Demisting windo ws............................... 13 6
Vo ice command types (LINGUA‐
TRONIC)...................................................... 24 0
Vo ice control sy stem
see LINGU ATRO NIC W
Wa rning lamp
see Warning/indicator lamp
Wa rning sy stem
see ATA (anti-theft alarm sy stem) Wa
rning triangle
Re moving............................................... 376
Setting up.............................................. 377
Wa rning/indicator lamp
! ABSwarning lamp....................... .497
J Brake sy stem warning lamp
(red)...................................................... 495
J Brake sy stem warning lamp
(yellow).................................................. 495
ÿ Coolant warning lamp................... 491
! Electric parking brake indicator
lamp (red).............................................. 494
# Electrical fault warning lamp........ 493
; Engine diagnosis warning lamp.... 493
å ESP®
OFF warning lamp.............. .499
÷ ESP®
wa rning lamp..................... .498
8 Fuelreser ve wa rning lamp
lights up................................................ 494
Ù Powe rst eering warning lamp
(red)...................................................... 490 6
Restra int sy stem warning lamp.... 489
ü Seat belt warning lamp................ 489
ä Suspension warning lamp (yel‐
low)....................................................... 497
! The elect ric pa rking brake (yel‐
low) indicator lamp................................ 494
ï Trailer tow hit chwarning lam p...... 491
h Tyre pressure monitoring sys‐
te m wa rning lamp.................................. 500
L Warning lamp for dis tance
wa rning function................................... 496
Overview............................................... 487
Wa rning/indicator lamps
PA SSENGER AIR BAG.............................. 49
Wa rranty ...................................................... 32
Wa sher fluid
see Windsc reen washer fluid
Wa shing byhand (care)............................ 371
Wa ter tank
see Air-water duct Index
539