cooling MERCEDES-BENZ C-CLASS CABRIOLET 2018 Owner's Manual

1, 2, 3 ...
4ETS (Electronic Traction System)see ETS/4ETS (Electronic Trac-
tion System)
4MATIC (permanent four-wheel
drive) .................................................. 166
12 V socket
see Socket (12 V)
360° camera
Cleaning .........................................2 92
Display in the multimedia system .. 178
Function/notes .............................1 76
A
ABS (Anti-lock Braking System)
Display message ............................ 213
Function/notes ................................ 64
Warning lamp ................................. 244
Acceleration
see Kickdown
Accident
Automatic measures after an acci-
dent ................................................. 59
Accident warning
see Driving safety system
Activating media mode
General notes ................................ 261
Activating/deactivating cooling
with air dehumidification ................. 117
Active Blind Spot Assist
Activating/deactivating (on-
board computer) ............................ 205
Display message ............................ 230
Function/notes .............................1 86
Active Brake Assist
Activating or deactivating .............. 204
Display message ............................ 218
Function/notes ................................ 65
Active Brake Assist with cross-
traffic function
Activating or deactivating .............. 205
Display message ............................ 219
Function/notes ................................ 71
Important safety notes .................... 72
Warning lamp ................................. 250 Active Lane Keeping Assist
Activating/deactivating (on-
board computer) ............................ 205
Display message ............................ 229
Function/information .................... 189
Active light function
Display message ............................ 224
Active Service System PLUS
see ASSYST PLUS
ADAPTIVE BRAKE ................................. 71
Adaptive Brake Assist
Function/notes ................................ 67
Adaptive Damping System
Function/notes ............................. 165
Adaptive Damping System with
continuous damping adjustment
(ADS PLUS) ........................................ 164
Adaptive Highbeam Assist
Display message ............................ 224
Function/notes ............................. 109
Switching on/off ........................... 110
Additional speedometer ................... 207
Additives (engine oil) ........................ 343
Address book
see also Digital Operator's Man-
ual .................................................. 253
A

djusting the volume
Multimedia system ........................ 254
After-sales service center
see ASSYST PLUS
Air bags
Deployment ..................................... 56
Display message ............................ 222
Front air bag (driver, front
passenger) ....................................... 50
Head bag ......................................... 51
Important safety notes .................... 49
Introduction ..................................... 48
Knee bag .......................................... 50
Occupant Classification System
(OCS) ............................................... 51
PASSENGER AIR BAG indicator
lamps ............................................... 44
Side impact air bag .......................... 50
Air vents
Important safety notes .................. 120
Rear ............................................... 120
Setting ........................................... 120
4Index

see Flat tire
see Towing away
Brightness control (instrument
cluster lighting) ................................... 35
Buttons on the steering wheel ......... 193
C
California
Important notice for retail cus-
tomers and lessees .......................... 28
Calling up a malfunction
see Display messages
Calling up the climate control bar
Multimedia system ........................ 258
Calling up the climate control
menu
Multimedia system ........................ 258
Camera
see 360° camera
see Rear view camera
Car
see Vehicle
Car wash
see Care
Care
360° camera ................................. 292
AIRCAP .......................................... 289
Car wash ........................................2 86
Carpets .......................................... 294
Display ...........................................2 93
Exhaust pipe .................................. 292
Exterior lights ................................ 291
General notes ................................ 286
Interior ...........................................2 93
Matte finish ................................... 289
Paint .............................................. 288
Plastic trim ....................................2 93
Power washer ................................ 288
Rear view camera .......................... 292
Roof lining ...................................... 294
Seat belt ........................................ 294
Seat cover ..................................... 294
Selector lever ................................ 293
Sensors ......................................... 292
Soft top .......................................... 289
Steering wheel ............................... 293
Trim pieces .................................... 293 Washing by hand ........................... 287
Wheels ........................................... 291
Wind deflector ............................... 289
Wind screen ................................... 290
Windows ........................................ 291
Wiper blades .................................. 291
Wooden trim .................................. 293
Cargo tie down rings ......................... 266
CD
see also Digital Operator's Man-
ual .................................................. 253
CD player (on-board computer) ........ 201
Center console
Lower section .................................. 39
Lower section (Mercedes-AMG
vehicles) .......................................... 40
Upper section .................................. 38
Central locking
Locking/u
nlocking (SmartKey) ........ 76
Change of address .............................. 29
Change of ownership .......................... 29
Changing the media source ............. 200
Charge-air pressure (on-board
computer, Mercedes-AMG vehi-
cles) .................................................... 208
Child
Restraint system .............................. 60
Child seat
Forward-facing restraint system ...... 63
LATCH-type (ISOFIX) child seat
anchors ............................................ 61
On the front-passenger seat ............ 63
Rearward-facing restraint system .... 63
Top Tether ....................................... 62
Children
Special seat belt retractor ............... 60
Children in the vehicle
Important safety notes .................... 59
Cigarette lighter ................................ 270
Cleaning
Mirror turn signal ........................... 292
Climate control
Control panel for dual-zone auto-
matic climate control ..................... 115
Controlling automatically ............... 117
Cooling with air dehumidification .. 117
Index7

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

Overview of climate control systems
General notes
Observe the settings recommended on the fol-
lowing pages. The windows could otherwise fog
up.
To prevent the windows from fogging up:
Rswitch off climate control only briefly
Rswitch on air-recirculation mode only briefly
Rswitch on the cooling with air dehumidifica-
tion function
Ractivate the "Windshield defrosting" function
briefly, if required
Climate control regulates the temperature and
air humidity in the vehicle interior. The interior
filter cleans the air, thus improving the interior
climate.
The "Cooling with air dehumidification" function
is only available when the engine is running.
Optimum climate control is only achieved with
the side windows and roof closed.
If you start the engine using your smartphone,
the last selected climate control setting is reac-
tivated (
Ypage 126). The integrated filter filters out most particles of
dust and soot and completely filters out pollen.
It also reduces gaseous pollutants and odors. A
clogged filter reduces the amount of air suppliedto the vehicle interior. For this reason, you
should always observe the interval for replacing
the filter, which is specified in the Maintenance
Booklet. As it depends on environmental condi-
tions, e.g. heavy air pollution, the interval may
be shorter than stated in the Maintenance Book-
let.
iVentilate the vehicle for a brief period during
warm weather, e.g. using the convenience
opening feature (
Ypage 90). This will speed
up the cooling process and the desired inte-
rior temperature will be reached more
quickly.
iIt is possible that the blower may be activa-
ted automatically 60 minutes after the Smart-
Key has been removed depending on various
factors, e.g. the outside temperature. The
vehicle is then ventilated for 30 minutes to dry
the automatic climate control.
Control panel for dual-zone automatic climate control
Example: control panel for dual-zone automatic climate control
:
Sets the temperature, left (Ypage 118)
;Sets the air distribution (Ypage 118)
=Sets the airflow (Ypage 118)
Switches off climate control (
Ypage 116)
Overview of climate control systems115
Climate control

?Sets climate control to automatic (Ypage 117)
ADefrosts the windshield (Ypage 118)
BCalls up the climate control menu of the multimedia system (Ypage 258)
CSwitches the rear window defroster on/off (Ypage 119)
DActivates or deactivates synchronization (Ypage 118)
ESwitches air-recirculation mode manually on/off (Ypage 120)
FSwitches cooling with air dehumidification on/off (Ypage 117)
GSets the temperature, right (Ypage 118)
Optimum use of automatic climate
control
Optimum use of the automatic climate
control
The following contains notes and recommenda-
tions on optimum use of dual-zone automatic
climate control.
XActivate climate control using the Ã
rocker switch. The indicator lamp above the
à rocker switch lights up. The "Cooling
with dehumidification" function is activated in
automatic mode.
XSet the temperature to 72 ‡ (22 †).
iOnly use the "Windshield defrosting" func-
tion briefly until the windshield is clear again.
iOnly use air-recirculation mode briefly, e.g.
if there are unpleasant outside odors or when
in a tunnel. The windows could otherwise fog
up, since no fresh air is drawn into the vehicle in air-recirculation mode.
DYNAMIC SELECT switch (except
Mercedes-AMG C 63 /C63S)
You can choose between various drive programs
with the DYNAMIC SELECT switch
(
Ypage 130).
If you have selected drive program E:
Rwhen heating, the electrical heater booster is
deactivated and heat output is reduced as a
result
Rthe rear window defroster running time is
reduced If you have selected drive program
C,Sor S+,
the current climate settings are maintained.
ECO start/stop function
During automatic engine switch-off, the climate
control system only operates at a reduced capa-
city. If you require the full climate control output,
you can switch off the ECO start/stop function
by pressing the ECO button (
Ypage 128).
Operating the climate control sys-
tems
Activating/deactivating climate con-
trol
General notes
When the climate control is switched off, the air
supply and air circulation are also switched off.
The windows could fog up. Therefore, switch off
climate control only briefly
Switch on climate control primarily using the
à rocker switch (
Ypage 117).
Activating/deactivating
XTurn the SmartKey to position 2in the igni-
tion lock (Ypage 123).
XTo switch on: set the airflow to level 1or
higher using the Hrocker switch.
XTo switch off: set the airflow to level 0using
the H rocker switch.
116Operating the climate control systems
Climate control

Switching cooling with air dehumidification on/off
General notes
If you deactivate the "Cooling with air-dehumidification" function, the air inside the vehicle will not
be cooled. The air inside the vehicle will also not be dehumidified. The windows can fog up more
quickly. Therefore, only deactivate the "Cooling with air-dehumidification" function briefly.
The "Cooling with air dehumidification" function is only available when the engine is running. The air
inside the vehicle is cooled and dehumidified according to the temperature selected.
Condensation may drip from the underside of the vehicle when it is in cooling mode. This is normal
and not a sign that there is a malfunction.
Activating/deactivating
XPress the ¿rocker switch up or down.
The indicator lamp above the rocker switch lights up or goes out.
Problems with the "Cooling with air dehumidification" function
ProblemPossible causes/consequences and MSolutions
The indicator lamp above
the¿ rocker switch
remains off. The cooling
with air dehumidification
function cannot be acti-
vated via the multimedia
system any longer
(
Ypage 258).
Cooling with air dehumidification has been deactivated due to a mal-
function.
XVisit a qualified specialist workshop.
Setting climate control to automatic
General notes
In automatic mode, the set temperature is main-
tained automatically at a constant level. The
system automatically regulates the temperature
of the dispensed air, the airflow and the air dis-
tribution.
During automatic controlling, the "Cooling with
air dehumidification" function is activated.
The system automatically detects whether the
soft top is open or closed and automatically
adjusts the air settings depending on the soft
top status.
Automatic control
XTurn the SmartKey to position 2in the igni-
tion lock (Ypage 123).
XTo activate: press theÃrocker switch up
or down.
The indicator lamp above the Ãrocker
switch lights up.
XSet the desired temperature using the w
rocker switch on the front control unit.
XTo switch to manual operation: press the
H rocker switch up or down.
or
XPress the _rocker switch up or down.
The indicator lamp above the Ãrocker
switch goes out.
In automatic mode, if you adjust the airflow or
air distribution manually, the indicator lamp
above the Ãrocker switch goes out. The
function which has not been changed manually,
however, continues to be controlled automati-
cally. When the manually set function switches
Operating the climate control systems117
Climate control

back to automatic mode, the indicator lamp
above theÃrocker switch lights up again.
Setting the temperature
Dual-zone automatic climate control: different
temperatures can be set for the driver's and
front-passenger sides.
XTurn the SmartKey to position 2in the igni-
tion lock (Ypage 123).
XTo increase or reduce: press thew
rocker switch up or down.
Only change the temperature setting in small
increments. Start at 72 ‡ (22 †).
Setting the air distribution
Air distribution settings
¯ Directs air through the defroster vents
P Directs air through the center and side air
vents
O Directs air through the footwell air vents
S Directs air through the center, side and
footwell vents
a Directs air through the defroster and
footwell vents
_ Directs air through the defroster, center,
side and footwell vents
b Directs air through the defroster, center
and side air vents
W Sets the air distribution to automatic
Setting
XTurn the SmartKey to position 2
(Ypage 123).
XPress the _rocker switch up or down.
The various air distribution settings appear in
the multimedia system.
Setting the airflow
XTurn the SmartKey to position 2in the igni-
tion lock (Ypage 123).
XTo increase or reduce: press theH
rocker switch up or down.
Activating or deactivating the syn-
chronization function
General notes
Climate control can be set centrally using the
synchronization function. The temperature set-
ting is adopted for the front-passenger side.
Activating/deactivating
XPress the 0rocker switch up or down.
The indicator lamp above the 0rocker
switch lights up or goes out.
or
XActivate or deactivate the "Synchronization"
function using the multimedia system
(
Ypage 118).
The synchronization function deactivates if the
settings for the front-passenger side are
changed.
Defrosting the windshield
General notes
You can use this function to defrost the wind-
shield or to clear a fogged up windshield or front
side windows on the inside.
Switch off the "Windshield defrosting" function
as soon as the windshield is clear again.
Switching the "Windshield defrosting"
function on or off
XTurn the SmartKey to position 2in the igni-
tion lock (Ypage 123).
XTo switch on: press rocker switch ¬on
the front control unit up or down.
The indicator lamp above the ¬rocker
switch lights up. The current climate control
settings are deactivated.
The climate control system switches to the
following functions:
Rhigh airflow
Rhigh temperature
Rair distribution to the windshield and front
side windows
Rair-recirculation mode off
iIf necessary, the "Cooling with air dehumid-
ification" function is activated. In this case,
118Operating the climate control systems
Climate control

the indicator lamp above the¿rocker
switch remains switched off.
XTo switch off: press rocker switch ¬up or
down.
The indicator lamp above the ¬rocker
switch goes out. The previously selected set-
tings are restored. Air-recirculation mode
remains deactivated.
Defrosting the windows
Windows fogged up on the inside
XActivate the "Cooling with air dehumidifica-
tion" function with the ¿rocker switch.
XSwitch on automatic mode using the Ã
rocker switch.
XIf the windows continue to fog up, activate the "Windshield defrosting" function using the
¬ rocker switch.
iYou should only select this setting until the
windshield is clear again.
Windows fogged up on the outside
XActivate the windshield wipers.
XSwitch on automatic mode using the Ã
rocker switch.
iIf you clean the windows regularly, they do
not fog up so quickly.
Rear window defroster
General notes
The rear window defroster has a high current
draw. You should therefore switch it off as soon
as the rear window is clear. Otherwise, the rear
window defroster switches off automatically
after several minutes.
If the battery voltage is too low, the rear window defroster may switch off.
Activating/deactivating
XTurn the SmartKey to position 2in the igni-
tion lock (Ypage 123).
XPress rocker switch ¤up or down.
The indicator lamp above rocker switch ¤
lights up or goes out.
Problems with the rear window defroster
ProblemPossible causes/consequences and MSolutions
The rear window
defroster has deactiva-
ted prematurely or can-
not be activated.The battery has not been sufficiently charged.
XSwitch off any consumers that are not required, e.g. reading lamps,
interior lighting or the seat heating.
When the battery is sufficiently charged, the rear window defroster
can be activated again.
Switching air-recirculation mode
on/off
General notes
You can also temporarily deactivate the flow of
fresh air manually if unpleasant odors are enter-
ing the vehicle from outside. The air already
inside the vehicle will then be recirculated.
If you switch on air-recirculation mode, the win-
dows can fog up more quickly, in particular at low temperatures. Only use air-recirculation
mode briefly to prevent the windows from fog-
ging up.
Operating the climate control systems119
Climate control

Activating/deactivating
XTurn theSmartKey to position 2in th eigni-
tion loc k (Ypage 123).
XTo activate: press theg rockerswitch up
or down .
The indicator lamp abov eth eg rocker
switch lights up.
Air-recirculation mod eswitches on automati-
cally:
Rat high outside temperatures
Rin atunne l(vehicles wit h anavigation system
only)
The indicator lamp abov eth eg rocker
switch is no tlit when automatic air-recirculation
mod eis activated. Outside air is added after
about 30 minutes.
XTo deactivate: press theg rockerswitch
up or down .
The indicator lamp abov eth eg rocker
switch goe sout .
Air-recirculation mod edeactivates automati-
cally:
Rafter approximately fiv eminute sat outside
temperatures belo wapproximately 41 ‡
(5 †)
Rafter approximately five minutes if cooling
with air dehumidification is deactivated
Rafter approximately 30 minutes at outside
temperatures above approximately 41 ‡
(5 †) if the "Cooling with dehumidification"
function is activated
Ionization
Ionization is used to purify the air in the vehicle
interior and attain an improved interior climate.
The ionization of the interior air is odorless and
cannot be perceived directly in the vehicle inte-
rior.
You can switch ionization on/off using the mul-
timedia system (
Ypage 258).
Ionization can only be operated when the auto-
matic climate control is switched on. The side air
vent on the driver's side must be open.
Air vents
Important safety notes
GWARNING
Very hot or very cold air can flow from the air
vents. This could result in burns or frostbite in
the immediate vicinity of the air vents. There
is a risk of injury.
Make sure that all vehicle occupants always
maintain a sufficient distance to the air out-
lets. If necessary, redirect the airflow to
another area of the vehicle interior.
In order to ensure the direct flow of fresh air
through the air vents into the vehicle interior,
please observe the following notes:
Rkeep the air inlet between the windshield and
the hood free of blockages, such as ice, snow or leaves.
Rnever cover the air vents or air intake grilles in
the vehicle interior.
Setting the air vents
Air vents are located:
Ron the left and right-hand side of the dash-
board
Rin the middle of the dashboard
Rin the front head restraints
Rin the rear center console, depending on the
equipment installed
Side air vent (example)
:Side window defroster vent
;Side air vent, left
=Control for left side air vent
120Air vents
Climate control

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