2018 MERCEDES-BENZ SLC climate control

ECO start/stop function During automatic engine switch-off ,t he climate
control system only operate satar educed capa-
city. If you require full climate control capacity,
th eE CO start/sto pf unction can be deactivated
by pressin gt he ECO button ( Y
page 120).
Operating th ec limat ec ontrol sys-
tems
Activating/deactivatin gc limat ec on-
trol
General notes When th ec limate control is switched off ,t he air
supply and air circulation are also switched off.
The windows coul df og up. Therefore, switch off
climate control only briefly
i Activate climate control primarily usin gt he
X butto n( Y
page 109).
Air-conditioning system X
Turn th eS ma rtKey to position H in th ei gni-
tio nl oc k( Y
page 116).X
To switch on: tur na irflow control k clock-
wise to th ed esired position (excep tp osition
0 )( Y
page 104).X
To switch off: tur na irflow control k coun-
ter-clockwise to position 0 ( Y
page 104).
3-zone automatic climat ec ontrolX
Turn th eS ma rtKey to position H in th ei gni-
tio nl oc k( Y
page 116).X
To switch on: pres st he X button.
The indicator lamp in the X button lights
up. Airflow and air distribution are set to auto-
matic mode.
or X
Press the x button.
The indicator lamp in the x button goes
out .T he previously selecte ds ettings are
restored. X
To switch off: pres st he x button.
The indicator lamp in the x button lights
up. Switching cooling with air dehumidi-
fication on/off
General notes If you deactivate th e" Coolin gw ith air-dehumid-
ification" function ,t he air inside th ev ehicle will
no tbec ooled. The air inside th ev ehicle will also
no tbed ehumidified. The windows can fog up
mor eq uickly. Therefore, deactivate th ec ooling
with air-dehumidification function only briefly.
The "Coolin gw ith air dehumidification "f unction
is only availabl ew hen th ee ngine is running. The
air inside th ev ehicle is cooled and dehumidified
according to th et em peratur es elected.
Condensation may drip from th eu ndersid eo f
th ev ehicle when it is in cooling mode. This is
normal and no tas ign that there is am alfunc-
tion.
Activating/deactivating X
To activate: pres st he Z or V button.
The indicator lamp in the Z or V button
light su p. X
To deactivate: pres st he Z or V but-
ton.
The indicator lamp in the Z or V button
goes out .T he "Coolin gw ith air dehumidifica-
tion" function has ad elayed switch-off fea-
ture.108
Operating th ec limate control systems
Climate control

Problems with the "Cooling with air dehumidification" function Problem
Possible causes/consequences and P Solutions
The indicator lamp in the
Z or V button
flashes three times or
remains off. The "Cool-
ing with air dehumidifi-
cation" function cannot
be switched on. Cooling with air dehumidification has been deactivated due to am al-
function. X
Visit aq ualified specialist workshop.
Setting climate control to automatic
General notes Automatic mode is only available with 3-zone
automatic climate control.
In automatic mode, the set temperature is main-
tained automatically at ac onstant level. The
system automatically regulates the temperature
of the dispensed air, the airflow and the air dis-
tribution.
The automatic mode functions optimally when
the "Cooling with air dehumidification" function
is activated. If necessary, cooling with air dehu-
midification can be deactivated.
If you deactivate the "Cooling with air-dehumid-
ification" function, the air inside the vehicle will
not be cooled. The air inside the vehicle will also
not be dehumidified .T he windows can fog up
more quickly. Therefore, deactivate the cooling
with air-dehumidification function only briefly.
Automatic control X
Turn the SmartKey to position H in the igni-
tion lock ( Y
page 116).X
Set the desired temperature. X
To activate: press the X button.
The indicator lamp in the X button lights
up. Automatic air distribution and airflow are
activated. X
To switch to manua lm ode: press the

The climate control system switches to the
following functions: R
high airflow R
high temperature R
air distribution to the windshield and front
side windows R
air-recirculation mode off X
To switch off: press the d button.
The indicator lamp in the d button goes
out. The previously selected settings are
restored. Air-recirculation mode remains
deactivated.
or X
Dual-zon ea utomatic climate control: press
the X button.
The indicator lamp in the d button goes
out. Airflow and air distribution are set to
automatic mode.
MAX COOL maximum cooling The MAX COOL function is only availabl einv ehi-
cles for the USA.
MAX COOL is only operational when the engine
is running. X
To activate: press the

Problems with the rear window defroster Problem
Possible causes/consequences and P Solutions
The indicator lamp on
the l button flashes.
The rear window
defroster has deactiva-
ted prematurely or can-
not be activated. The on-board voltage is too low because too many electrical consum-
ers are switched on. X
Switch 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.
The roof is open. X
Close the roof.
When the roof is closed, the rear window defroster can be activated
again.
Switching air-recirculation mode
on/off
General notes 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.
Activating/deactivating X
Turn the SmartKey to position H in the igni-
tion lock ( Y
page 116).X
To activate: press the r button.
The indicator lamp in the r button lights
up.
i Air-recirculation mode is automatically acti-
vated at high levels of pollution (dual-zone
automatic climate control only) or at high out-
side temperatures. When air-recirculation
mode is activated automatically, the indicator
lamp in the r button is not lit. Outside air
is added after about 30 minutes. X
To deactivate: press the r button.
The indicator lamp in the r button goes
out. i Air-recirculation mode deactivates auto-
matically: R
after approximately five minutes at outside
temperatures below approximately 41 ‡
(5 †) R
after approximately five minutes if cooling
with air dehumidification is deactivated R
after approximately 30 minutes at outside
temperatures above approximately 41 ‡
(5 †) if the "Cooling with air dehumidifica-
tion" function is activated
Switching the residual heat on or off
General notes The residual heat function is only available on
vehicles for Canada.
It is possible to make use of the residual heat of
the engine to continue heating the stationary
vehicle for up to 30 minutes after the engine has
been switched off. The heating time depends on
the set interior temperature.
Activating/deactivating X
Turn the SmartKey to position

i If you activate the residual heat function at
high temperatures, only the ventilation wil lb e
activated. The blower runs at mediu ms peed.X
To deactivate: press the K or V but-
ton.
The indicator lamp in the K or V button
goes out.
Residua lh eat is deactivated automatically:R
after approximately 30 minutes R
when the ignition is switched on R
if the battery voltage drops
Setting the air vents
Important safety notes
G WARNING
Very hot or very cold air can flow from the air
vents. This could resul tinb urns or frostbite in
the immediate vicinity of the air vents. There
is ar isk of injury.
Make sure that all vehicle occupants always
maintain as ufficient distance to the air out-
lets. If necessary ,r edirect the airflow to
another area of the vehicle interior.
G WARNING
When AIRSCARF is switched on, very hot air
can flow from the vents in the head restraints.
This could resul tinb urns in the immediate
vicinity of the air vents. There is ar isk of injury.
Reduce the heater outpu tb efore it becomes
too hot.
In order to ensure the direct flow of fresh air
through the air vents into the vehicle interior,
please observe the following notes: R
keep the air inlet grill eont he hood and in the
engine compartment on the front-passenger
side free of blockages, such as ice, snow or
leaves. R
never cover the air vents or air intake grilles in
the vehicle interior.
i You can move the adjusters for the air vents
verticall yorh orizontally to set the direction of
the airflow. i For optimal climate control in the vehicle,
open the air vents completely and set the
adjusters to the central position.
Setting the center air vents X
To open the center air vents: turn the
adjuster in one of center air vents C counter-
clockwise. X
To close the center air vents: turn the
adjuster in one of center air vents C clock-
wise until it engages.
Setting the side air vents
C
Side window defroster vent
D
Side air vent X
To open as ide air vent: turn the adjuster in
the side air vent D to the left.X
To close as ide air vent: turn the adjuster in
the side air vent D to the right until it
engages.Setting the air vents 113
Climate control Z

Calibratin gt he compassX
Mak es ure that there is sufficient spac ef or
you to driv einac ircle without impedin gt ra f-
fic.
In order to calibrat et he compass correctly, do
th ef ollowing: R
calibrat et he compass in th eo pen and no ti n
th ev icinity of steel structures or high-voltage
transmission lines. R
switch off electrical consumers suc hast he
climate control, windshield wiper sorr ear win-
dow defroster. R
close all door sa nd th et ru nk lid.X
Switch on th ei gnition.X
Push ar oun dp en int oo pening

! Lock the car if you wash it in an automatic
car wash. Otherwise, the vehicle might be
damaged.
! Never clean your vehicle in aT ouchless
Automatic Car Wash as these use special
cleaning agents. These cleaning agents can
damage the paintwork or plastic parts.
If you have your vehicle cleaned in ah igh-
pressure automatic car wash, small amounts
of water may enter the vehicle.
! Make sure that the automatic transmission
is in position N when washing your vehicle in
at ow-through car wash. The vehicle could be
damage dift he transmission is in another
position.
! Make sure that: R
the side windows and the roof are com-
pletely closed R
the climate control blower is switched off R
the windshiel dw iper switch is at position 0
The vehicle could otherwise be damaged.
You can clean the vehicle at an automatic car
wash from the very start.
Preferably clean the vehicle at automatic car
washes that use textile washing elements with-
out brushes. This prevents fine scratches from
forming on the paintwork and film.
If the vehicle is very dirty, pre-wash it before
cleaning it in an automatic car wash.
After using an automatic car wash, wipe off wax
from the windshiel da nd the wiper blades. This
will prevent smears and reduce wiping noises
caused by residue on the windshield.
i Vehicles with decorative film: select aw ash
program without hot wax at the automatic car
wash.
Washing by hand In some countries, washing by hand is only
allowed at speciall ye quipped washing bays.
Observe the legal requirements in each country. X
Do not use hot water and do not wash the
vehicle in direct sunlight. X
Use as oft sponge to clean.X
Use am ild cleaning agent, such as ac ar
shampoo approved by Mercedes-Benz. X
Thoroughly hose down the vehicle with ag en-
tle jet of water. X
Do not point the water jet directly towards the
air inlet or the edges of decorative foils. X
Use plenty of water and rinse out the sponge
frequently. X
Rinse the vehicle with clean water and dry
thoroughly with ac hamois.X
Do not let the cleaning agent dry on the paint-
work or the decorative foils.
Carefully remove all deposits of road salt as
soon as possible when driving in winter.
Powe rw ashers
G WARNING
The water jet from ac ircular jet nozzle (dirt
blasters) can cause invisible exterior damage
to the tires or chassis components. Compo-
nent sd amage dint his way may fail unexpect-
edly .T here is ar isk of an accident.
Do not use power washers with circular jet
nozzles to clean the vehicle. Have damaged
tires or chassis component sr eplaced imme-
diately.
! Vehicles with decorative foil: parts of your
vehicle are covered with decorative foil. Main-
tain ad istance of at least 27.5 in (70 cm)
between the foil-wrappe dp arts of the vehicle
and the nozzle of the high pressure cleaner.
Information abou tt he correct distance is
available from the equipment manufacturer.
Move the power washer nozzle around when
cleaning your vehicle.
The water temperature of the high-pressure
cleaner must not exceed 140 °F (60 °C).
! Alway sm aintain ad istance of at least
11.8 in (30 cm) between the vehicle and the
power washer nozzle. Information abou tt he
correct distance is available from the equip-
ment manufacturer.
Move the power washer nozzle around when
cleaning your vehicle.
Do not aim directly at any of the following: R
tires R
door gaps, roof gaps, joints, etc. R
electrical components R
battery R
plug-type couplings R
lights Care 239
Maintenance and care Z

The antifreeze/corrosion inhibitor concentra-
tion in the engine cooling system should: R
be at least 50%. This will protec tt he engine
cooling system against freezin gd own to
approximately -35 ‡( -37 †).R
not exceed 55% (antifreez ep rotection down
to -49 ‡[ -45 †]). Otherwise, heat will not be
dissipated as effectively
If the vehicle has lost coolant, add equal
amounts of water and antifreeze/corrosion
inhibitor.
Mercedes-Benz recommends an antifreeze/
corrosion inhibitor concentrate in accordance
with MB Specifications for Servic eP roducts
310.1.
i When the vehicle is first delivered, it is filled
with ac oolant mixture that ensures adequate
antifreeze and anti-corrosion protection.
i The coolant is checked with every mainte-
nanc ei nterval at aq ualified specialist work-
shop.
Fillin gc apacitiesMissing values were not availabl eatt ime of
going to print.
Model Capacity
SLC 300
Approx .8 .5 US qt
(8.0 l)
Mercedes ‑ Benz
SLC 43 AMG Approx .8 .2 US qt
(7.8 l)
Windshield washer system
Important safety notes
G WARNING
Windshield washer concentrate could ignite if
it comes into contact with hot engine compo-
nent sort he exhaust system. There is ar isk of
fire and injury.
Make sure that no windshield washer con-
centrate is spilled next to the filler neck.
! Only use washer fluid that is suitable for
plastic lamp lenses, e.g. MB SummerFit or MB
WinterFit. Unsuitable washer fluid could dam-
age the plastic lenses of the headlamps. ! Only MB SummerFit and MB WinterFit
washer fluid should be mixed together. The
spray nozzles may otherwise become
blocked.
Do not use distilled or de-ionised water. Other-
wise, the level sensor may give af alse reading.
When handling washer fluid, observe the impor-
tant safety notes on service products
( Y
page 290).
At temperatures above freezing: X
Fill the washer fluid reservoir with am ixture of
water and windshield washer fluid, e.g. MB
SummerFit. X
Add 1p art MB SummerFit to 100 parts water.
At temperatures below freezing: X
Fill the washer fluid reservoir with am ixture of
water and washer fluid, e.g. MB WinterFit.
For the correc tm ixing ratio refer to the infor-
mation on the antifreeze reservoir.
i Add windshield washer fluid, e.g. MB Sum-
merFit or MB WinterFit, to the washer fluid all
year round.
Climate control system refrigerant
Important safety notes The climate control system of your vehicle is fil-
led with refrigerant R ‑ 134a.
The instruction label regarding the refrigerant
type used can be found on the radiator cross
member.
! Only the refrigerant R ‑ 134a and the PAG oil
approved by Mercedes-Benz may be used.
The approved PAG oil may not be mixed with
any other PAG oil that is not approved for
R-134a refrigerant .O therwise, the climate
control system may be damaged.
Servic ew ork, such as refilling with refrigerant or
replacing component parts, may only be carried
out by aq ualified specialist workshop. All appli-
cable regulations, as well as SAE standard J639,
must be adhered to.
Always have work on the climate control system
carried out at aq ualified specialist workshop.294
Service products and filling capacities
Technical data