2018 MERCEDES-BENZ C-CLASS CABRIOLET engine coolant

Coolingwit h air dehumidif ication
(multimedia system) ...................... 258
Defrosting the windows ................ .119
Defrosting the windshield .............. 118
ECO start/stop function ................ 116
General notes ................................ 115
Indicator lamp ................................ 117
Ionization ....................................... 120
Ionization (multimedia system) ...... 258
Notes on using the automatic cli-
mate control .................................. 116
Overview ........................................ 257
Overview of systems ......................1 15
Problem with the rear window
defroster ........................................ 119
Problems with cooling with air
dehumidification ............................ 117
Refrigerant ..................................... 344
Refrigerant filling capacity ............. 345
Setting the air distribution ............. 118
Setting the air vents ......................1 20
Setting the airflow ......................... 118
Setting the climate mode (multi-
media system) ............................... 258
Setting the temperature ................ 118
Switching air-recirculation mode
on/off ............................................ 120
Switching on/off ........................... 116
Switching the rear window
defroster on/off ............................ 119
Switching the synchronization
function on and off ........................ 118
Synchronization function (multi-
media system) ............................... 258
Climate control settings
Multimedia system ........................ 257
Climate control system
Climate control .............................. 116
Cockpit
Overview .......................................... 35
Code for Apps
see QR code
COMAND display
Cleaning ......................................... 293
Combination switch .......................... 108
Connecting a USB device
see also Digital Operator's Man-
ual ..................................................2
53C
onsumption statistics (on-board
computer) .......................................... 197
Controller ...........................................2 54
Controlling the speed
see Distance Pilot DISTRONIC
Convenience opening feature ............ 90
Coolant (engine)
Checking the level ......................... 284
Display message ............................ 225
Filling capacity ............................... 344
Important safety notes .................. 343
Temperature display in the instru-
ment cluster .................................. 193
Warning lamp ................................. 248
Cooling
see Climate control
Copyright ............................................. 34
Cornering light function
Display message ............................ 224
Function/notes .............................1 09
Crosswind Assist ................................. 71
Cruise control
Cruise control lever ....................... 152
Deactivating ................................... 153
Display message ............................ 232
Driving system ............................... 151
Function/notes .............................1 51
General notes ................................ 151
Important safety notes .................. 151
Setting a speed .............................. 152
Storing and maintaining current
speed ............................................. 152
Storing the current speed or call-
ing up the last stored speed .......... 152
Cup holder
Center console .............................. 268
Important safety notes .................. 267
Rear compartment ......................... 268
Customer Assistance Center
(CAC) ..................................................... 31
Customer Relations Department ....... 31
D
Dashboard
see Instrument cluster
Dashboard lighting
see Instrument cluster lighting
8Index

Adjusting the 4-way lumbar sup-
port .................................................. 98
Adjusting the head restraint ............ 96
Calling up a stored setting (mem-
ory function) .................................. 106
Cleaning the cover ......................... 294
Folding the backrest (rear com-
partment) forwards/back .............. 265
Folding the backrests forward/
back ................................................. 97
Important safety notes .................... 94
Seat backrest display message ..... 238
Seat heating .................................... 99
Seat heating problem .................... 100
Seat ventilation ................................ 99
Seat ventilation problem ................ 100
Storing settings (memory func-
tion) ............................................... 106
Switching AIRSCARF on/off .......... 100
Securing a load
see Securing cargo
Securing cargo .................................. 266
Selecting a gear
see Automatic transmission
Selector lever
Cleaning ......................................... 293
see Automatic transmission
Sensors (cleaning instructions) ....... 292
Service center
see Qualified specialist workshop
Service Center
see Qualified specialist workshop
Service menu (on-board com-
puter) .................................................. 203
Service message
see ASSYST PLUS
Service products
Brake fluid ..................................... 343
Coolant (engine) ............................ 343
Engine oil ....................................... 342
Fuel ................................................ 340
Important safety notes .................. 340
Refrigerant (air-conditioning sys-
tem) ............................................... 344
Washer fluid ................................... 344
Setting the date/time format
see also Digital Operator's Man-
ual .................................................. 253 Setting the language
see also Digital Operator's Man-
ual .................................................. 253
Setting the time
see also Digital Operator's Man-
ual .................................................. 253
Se

ttings
Factory (on-board computer) ......... 207
On-board computer ....................... 203
SETUP (on-board computer,
Mercedes-AMG vehicles) .................. 209
Side impact air bag ............................. 50
Side marker lamp (display mes-
sage) ................................................... 224
Side windows
Cleaning ......................................... 291
Important safety information ........... 85
Opening/closing .............................. 86
Opening/closing (all) ....................... 86
Problem (malfunction) ..................... 87
Resetting ......................................... 87
Reversing feature ............................. 85
SIRIUS services
see also Digital Operator's Man-
ual .................................................. 253
SmartKey
Changing the battery ....................... 79
Changing the programming ............. 78
Checking the battery ....................... 79
Display message ............................ 240
Door central locking/unlocking ....... 76
Important safety notes .................... 76
KEYLESS-GO start function .............. 77
Loss ................................................. 80
Mechanical key ................................ 78
Opening/closing soft top ................. 90
Overview .......................................... 76
Positions (ignition lock) ................. 123
Problem (malfunction) ..................... 80
Starting the engine ........................ 125
Smartphone
Starting the engine ........................ 126
SMS
see also Digital Operator's Man-
ual .................................................. 253
Snow chains ...................................... 315
Socket (12 V)
Center console .............................. 270
Index19

Suspension tuningSETUP (on-board computer,
Mercedes-AMG vehicles) ............... 209
Switching air-recirculation mode
on/off .................................................1 20
Switching on media mode
Via the device list .......................... 261
T
Tachometer ........................................ 193
Tail lamps
Display message ............................ 224
Tank
see Fuel tank
Tank content
Fuel gauge ....................................... 36
Technical data
Capacities ...................................... 340
Information .................................... 338
Vehicle data ................................... 345
Telephone
Accepting a call (multifunction
steering wheel) .............................. 202
Authorizing a mobile phone (con-
necting) ......................................... 260
Connecting a mobile phone (gen-
eral information) ............................ 260
Display message ............................ 239
Introduction ................................... 202
Menu (on-board computer) ............ 202
Number from the phone book ........ 202
Redialing ........................................ 203
Rejecting/ending a call ................. 202
see also Digital Operator's Man-
ual .................................................. 253
Switching between mobile
phones ........................................... 261
see Mobile phone
Temperature
Coolant (display in the instrument
cluster) .......................................... 193
Engine oil (on-board computer,
Mercedes-AMG vehicles) ............... 208
Outside temperature ...................... 193
Setting (climate control) ................ 118
Transmission oil (on-board com-
puter, Mercedes-AMG vehicles) ..... 208 Through-loading feature
................... 265
Timing (RACETIMER) ......................... 210
Tire pressure
Calling up (on-board computer) ..... 319
Checking manually ........................ 318
Display message ............................ 234
Maximum ....................................... 318
Not reached (TIREFIT) .................... 299
Notes ............................................. 316
Reached (TIREFIT) .......................... 300
Recommended ............................... 315
Using the TIREFIT kit ...................... 298
Tire pressure loss warning system
General notes ................................ 318
Important safety notes .................. 318
Restarting ...................................... 319
Tire pressure monitor
Checking the tire pressure elec-
tronically ........................................ 321
Function/notes ............................. 319
Genera l note
s ................................ 319
Important safety notes .................. 319
Radio type approval for the tire
pressure monitor ........................... 322
Restarting ...................................... 321
Warning lamp ................................. 251
Warning message .......................... 321
Tire pressure sensors
Display message ............................ 235
Tire-change tool kit ........................... 296
TIREFIT kit
Important safety notes .................. 298
Storage location ............................ 296
Tire pressure not reached .............. 299
Tire pressure reached .................... 300
Using ............................................. 298
Tires
Aspect ratio (definition) ................. 331
Average weight of the vehicle
occupants (definition) .................... 329
Bar (definition) ............................... 329
Changing a wheel .......................... 331
Characteristics .............................. 329
Checking ........................................ 313
Curb weight (definition) ................. 330
Definition of terms ......................... 329
Direction of rotation ...................... 332
Display message ............................ 234
Index21

Vehicle batterysee Battery (vehicle)
Vehicle dimensions ........................... 345
Vehicle emergency locking ................ 83
Vehicle identification number
see VIN
Vehicle identification plate .............. 339
Vehicle level
AIRMATIC ...................................... 164
Display message ............................ 228
Video
Operating the DVD ......................... 201
see also Digital Operator's Man-
ual .................................................. 253
VIN
Seat ............................................... 340
Type plate ...................................... 339
W
Warning and indicator lampsABS ................................................ 244
Active Brake Assist ........................ 250
Airbag ............................................ 247
Brakes ........................................... 243
Coolant .......................................... 248
Distance warning ........................... 250
Engine diagnostics ......................... 247
ESP
®.............................................. 244
ESP®OFF ....................................... 246
Fuel tank ........................................ 247
General notes ................................ 241
Overview .......................................... 36
Parking brake ................................ 247
PASSENGER AIR BAG ...................... 44
Reserve fuel ................................... 247
Restraint system ............................ 247
Seat belt ........................................ 241
SPORT handling mode ................... 246
Steering ......................................... 252
Tire pressure monitor .................... 251
Warranty .............................................. 28
Washer fluid
Display message ............................ 239
Weather display (COMAND)
see also Digital Operator's Man-
ual .................................................. 253 Wheel and tire combinations
Tires ............................................... 336
Wheel bolt tightening torque ........... 336
Wheel chock ...................................... 332
Wheels
Changing a wheel .......................... 331
Checking ........................................ 313
Cleaning ......................................... 291
Important safety notes .................. 312
Information on driving .................... 312
Interchanging/changing ................ 331
Mounting a new wheel ................... 335
Mounting a wheel .......................... 332
Removing a wheel .......................... 335
Snow chains .................................. 315
Storing ........................................... 332
Tightening torque ........................... 336
Wheel size/tire size ....................... 336
Wind deflector (cleaning instruc-
tions) .................................................. 289
Wind screen ......................................... 91
Wind screen (cleaning instruc-
tions) .................................................. 290
Windows
see Side windows
Windshield
Defrosting ...................................... 118
Windshield washer fluid
see Windshield washer system
Windshield washer system
Adding washer fluid ....................... 285
Important safety notes .................. 344
Windshield wipers
Problem (malfunction) ................... 114
Repl acing the w
iper blades ............ 112
Switching on/off ........................... 111
Winter driving
Important safety notes .................. 314
Slippery road surfaces ................... 151
Snow chains .................................. 315
Winter operation
Radiator cover ............................... 282
Summer tires ................................. 314
Winter tires
M+S tires ....................................... 314
Wiper arm
Moving to a vertical position .......... 112
24Index

ProblemPossible causes/consequences andMSolutions
The engine does not
start. The starter motor
can be heard. The
reserve fuel warning
lamp is lit and the fuel
gauge display is at the
reserve level.The fuel tank is empty.
XRefuel the vehicle.
The engine does not
start. You cannot hear
the starter motor.The on-board voltage is too low because the battery is too weak or
discharged.
XJump-start the vehicle (Ypage 304).
If the engine does not start despite attempts to jump-start it:
XConsult a qualified specialist workshop.
The starter motor was exposed to a thermal load that was too high.
XTry to start the engine again (Ypage 125).
If the engine still does not start:
XConsult a qualified specialist workshop.
The engine is not running
smoothly and is misfir-
ing.There is a malfunction in the engine electronics or in a mechanical
component of the engine management system.
XOnly depress the accelerator pedal slightly.
Otherwise, non-combusted fuel may get into the catalytic converter
and damage it.
XHave the cause rectified immediately at a qualified specialist work-
shop.
The coolant temperature
display is pointing to the
red mark.The coolant level is too low. The coolant is too hot and the engine is no
longer being cooled sufficiently.
XStop as soon as possible and allow the engine and the coolant to
cool down.
XCheck the coolant level (Ypage 284). Observe the warning notes
as you do so and add coolant if necessary.
DYNAMIC SELECT switch
Mercedes-AMG vehicles
General information
Use the DYNAMIC SELECT switch to select the
drive program. Available drive programs for Mercedes-
AMG C 43 4MATIC:
S+
Sport PlusParticularly sporty driving
characteristics
SSportSporty driving characteris-
tics
C ComfortComfortable and economi-
cal driving characteristics
EEconomyParticularly economical
driving characteristics
IIndividualIndividual settings
130DYNAMIC SELECT switch
Driving and parking

Tachometer
!
Do not drive in the overrevving range, as this
could damage the engine.
The red band in the tachometer indicates the
engine's overrevving range.
The fuel supply is interrupted to protect the
engine when the red band is reached.
Outside temperature display
You should pay special attention to road condi-
tions when temperatures are around freezing
point.
Bear in mind that the outside temperature dis-
play indicates the temperature measured and
does not record the road temperature.
The outside temperature display is in the multi-
function display (
Ypage 194).
Changes in the outside temperature are dis-
played after a short delay.
Coolant temperature gauge
GWARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could expose you to hot gases
or other service products. There is a risk of
injury.
Let an overheated engine cool down before
opening the hood. If there is a fire in the
engine compartment, keep the hood closed
and contact the fire department.
!If the coolant temperature is too high, a dis-
play message is shown.
If the coolant temperature display is in the
area marked in red, do not continue driving.
Otherwise, the engine will be damaged.
The coolant temperature gauge is in the lower
section of the tachometer (
Ypage 36).
Under normal operating conditions and at the
correct coolant level, the display may rise to the
red mark.
Operating the on-board computer
:Multifunction display
;Right control panel
=Left control panel
XTo activate the on-board computer: switch
on the power supply.
You can control the multifunction display and
the settings in the on-board computer using the
buttons on the multifunction steering wheel.
Left control panel
òROpens a menu list
9
:Press briefly:
RScrolls in lists
RSelects a menu or function
RIn the RadioorMediamenu:
opens a track or station list and
selects a station, an audio track or
a video scene.
RIn the Telephonemenu: switches
to the phone book and selects a
name or a telephone number
9
:Press and hold:
RScrolls quickly through all lists
RIn the RadioorMediamenu:
selects a station, audio track or
video scene using rapid scrolling
RIn the Telephonemenu: starts
rapid scrolling if the phone book is
open
Displays an doperation193
On-boa rd computer and displays
Z

Engine
Display messagesPossible causes/consequences andMSolutions
+
CheckCoolantLevelSee Operator's Man‐ual
The coolant level is too low.
!Avoid making long journeys with too little coolant in the engine
cooling system. The engine will otherwise be damaged.
XAdd coolant, observing the warning notes before doing so
(Ypage 284).
If you have to add coolant frequently:
XContact a qualified specialist workshop and have the engine cooling
system checked.
?The fan motor is malfunctioning.
XIf the coolant temperature is below the red marking in the coolant
temperature gauge, drive to the nearest qualified specialist work-
shop.
XAvoid heavy loads on the engine as you do so, e.g. driving in moun-
tainous terrain and stop-and-go traffic.
?
Coolant Too HotStop Vehicle TurnEngine Off
The coolant is too hot.
A warning tone also sounds.
GWARNING
Do not drive when your engine is overheated. This can cause some
fluids which may have leaked into the engine compartment to catch
fire.
Steam from the overheated engine can also cause serious burns which
can occur just by opening the hood.
There is a risk of injury.
XPull over and stop the vehicle safely and switch off the engine, pay- ing attention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 143).
XWait until the engine has cooled down.
XMake sure that the air supply to the engine radiator is not blocked,
e.g. by snow, slush or ice.
XDo not start the engine again until the display message goes out and
the coolant temperature gauge is below the red marking. Other-
wise, the engine could be damaged.
XPay attention to the coolant temperature gauge.
If the temperature increases again:
XVisit a qualified specialist workshop immediately.
Under normal operating conditions and with the specified coolant
level, the coolant temperature gauge may rise to the red marking.
Display messages225
On-board computer and displays
Z

Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
8NThe yellow reserve fuel warning lamp flashes while the vehicle is in motion.
In addition, the ;Check Engine warning lamp may light up.
The fuel filler cap is not closed correctly or the fuel system is leaking.
XCheck that the fuel filler cap is correctly closed.
XIf the fuel filler cap is not correctly closed: close the fuel filler cap.
XIf the fuel filler cap is closed:visit a qualified specialist workshop.
?NThe red coolant warning lamp lights up while the engine is running and the
coolant temperature gauge is at the start of the scale.
The temperature sensor for the coolant temperature gauge is malfunctioning.
The coolant temperature is no longer being monitored. There is a risk of engine
damage if the coolant temperature is too high.
XPull over and stop the vehicle safely and switch off the engine, paying attention
to road and traffic conditions. Do not continue driving under any circumstances.
XSecure the vehicle against rolling away (Ypage 143).
XConsult a qualified specialist workshop.
248Warning and indicator lamps in the instrument cluster
On-board computer and displays