2015 MERCEDES-BENZ S-Class cooling

or
X Use the trocker switch to call up the
COMAND climate control menu. Defrosting the windows
Windows fogged up on the inside X
Activate the "Cooling with air dehumidifi-
cation" function with the Árocker
switch.
or X Activate the "Cooling with air dehumidifi-
cation" function via COMAND (see the sep- arate operating instructions).
X Switch on automatic mode using the Ã
rocker switch.
X If the windows continue to fog up, activate
the "Windshield defrosting" function using
the ¬ rocker switch. The windshield
heating is switched on.
i You should only select this setting until
the windshield is clear again.
Windows fogged up on the outside X
Activate the windshield wipers.
X Switch on automatic mode using the Ã
rocker switch.
i If 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 auto-
matically after several minutes.
If the battery voltage is too low, the rear win-
dow defroster may switch off. Activating/deactivating X
Turn the SmartKey to position 2in the igni-
tion lock (Y page 189).
X Press the ¤rocker switch up or down.
The indicator lamp in the ¤rocker
switch lights up or goes out. 176
Operating the climate control systemsClimate control

Problems with the rear window defroster
Problem
Possible causes/consequences and
M
MSolutions The rear window
defroster has deactiva-
ted prematurely or can-
not be activated. The battery has not been sufficiently charged.
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. Activating/deactivating air-recircula-
tion mode
General notes You can also temporarily deactivate the flow
of fresh air manually if unpleasant odors are
entering the vehicle from outside. The air
already inside the vehicle will then be recir-
culated.
If you switch on air-recirculation mode, the
windows can fog up more quickly, in particu-
lar at low temperatures. Only use air-recircu-
lation mode briefly to prevent the windows
from fogging up.
Activating/deactivating X
Turn the SmartKey to position 2in the igni-
tion lock (Y page 189).
X To activate: press thegrocker switch
up or down.
The indicator lamp in the grocker
switch lights up.
Air-recirculation mode is automatically acti-
vated at high levels of pollution or at high out- side temperatures. The indicator lamp in the
g rocker switch is not lit when automatic
air-recirculation mode is activated. Outside
air is added after about 30 minutes.
X To deactivate: press thegrocker
switch up or down.
The indicator lamp in the grocker
switch goes out. Air-recirculation mode deactivates automati-
cally:
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 Activating/deactivating the residual
heat function
General notes Vehicles with rear-compartment climate
control:
once the engine is switched off, it is
possible to make use of the residual heat of
the engine to continue heating or ventilating
the rear and front compartment of the vehicle
for approximately 15 minutes. If the "Residual
heat" function is set for only the front or only
the rear compartment, it is possible to con-
tinue heating or ventilating for approximately
30 minutes.
Vehicles without rear-compartment cli-
mate control: once the engine is switched
off, it is possible to make use of the residual
heat of the engine to continue heating or ven- tilating the front compartment of the vehicle
for approximately 30 minutes.
The heating or ventilation time depends on
the temperature that has been set. Operating the climate control systems
177Climate control

Activating the perfume atomizer/ionization
(see separate COMAND operating instruc-
tions).
Activating/deactivating "Pre-entry cli-
mate control via SmartKey" Before "Pre-entry climate control via Smart-
Key" can be switched on, you must activate
the function via COMAND (see separate oper-
ating instructions).
The function may also be activated via the
"Vehicle Homepage" (Y page 220).
X To activate pre-entry climate control
via SmartKey: unlock the vehicle with the
SmartKey or KEYLESS-GO.
The climate control functions are activated
for up to 5 minutes for pre-heating and pre- cooling.
To deactivate "Pre-entry climate control
via SmartKey": "Pre-entry climate control
via SmartKey" switches off automatically
when the engine is started.
The following functions remain active after
the engine is started:
R seat heating (heating)
R seat ventilation (ventilation)
R armrest heating
R perfume atomizer
R Ionization
An activated "Pre-entry climate control via
SmartKey" function can be deactivated using the rocker switch (Y page 183). Operating the climate control systems
181Climate control Z

The colors of the indicator lamps in the rocker
switch have the following meanings:
R blue: cooling activated
R red: heating activated
R yellow: departure time preselected
X To activate/deactivate "Immediate pre-
entry climate control" : press rocker
switch :up or down.
The blue or red indicator lamp above the
rocker switch lights up or goes out. Setting the air vents
Important safety notes
G
WARNING
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:
R keep the air inlet between the windshield
and the hood free of blockages, such as ice, snow or leaves.
R never cover the air vents or air intake grilles
in the vehicle interior. Setting the center air vents
:
Fixed center air vent
; Center air vent, right
= Center vent control, right
? Center vent control, left
A Center air vent, left
X To open/close: press control=or?.
The control pops out.
X Turn control =or? counter-clockwise or
clockwise.
X To adjust the air direction: hold rear air
vent ;orA by the middle fin and move up
or down or to the left or right. Setting the side air vents
:
Side window defroster vent
; Side air vent
= Thumbwheel for left side air vent 184
Setting the air ventsClimate control

X
To open/close: press control=.
The control pops out.
X Turn control =counter-clockwise or
clockwise.
X To adjust the air direction: hold side air
vent ;by the middle fin and move it up or
down or to the left or right. Setting the glove box air vent
! Close the air vent when heating the vehi-
cle.
At high outside temperatures, open the air
vent and activate the "cooling with air dehu- midification" function. Otherwise, temper-
ature-sensitive items stored in the glove
box could be damaged.
When the climate control system is activated, the glove box can be ventilated, for instance
to cool its contents. The level of airflow
depends on the airflow and air distribution
settings. :
Air vent thumbwheel
; Air vent
X To open/close: turn thumbwheel :to the
left or right. Setting the rear-compartment air
vents
Setting the center vents in the rear com-
partment :
Rear-compartment air vent, left
; Rear-compartment air vent, right
= Rear-compartment air vent control, right
? Rear control panel
A Rear-compartment air vent control, left
Vehicles with rear-compartment climate con-
trol
X To open/close: press control=orA.
The control pops out.
X Turn control =orA counter-clockwise or
clockwise.
X To adjust the air direction: hold the rear
air vent :or; by the middle fin and move
up or down or to the left or right. Setting the air vents
185Climate control Z

?
Vehicle socket
A Indicator lamp Ý
X Use the DIRECT SELECT lever to shift the
automatic transmission to P.
X Switch the ignition off.
X Press the charge socket flap in the direc-
tion of arrow :.
The charge socket flap swings up.
X Slide fastener ;to the right.
Vehicle socket flap =is open.
X Insert the power supply plug into the elec-
trical outlet to the stop.
X Insert the charging cable connector into
vehicle socket ?to the stop.
The high-voltage battery is being charged.
Ý indicator lamp Aon vehicle
socket ?flashes slowly green.
i The vehicle must not be moved during
charging or when the charging cable is con- nected.
i Depending on the temperature, the fan
and battery cooling system may audibly
switch on during the charging process.
Removing the charging cable When the charge level display reaches 100%
in the multifunction display, the battery is
fully charged (Y page 281).
i After the charging cable has been discon-
nected, the indicator lamp in the vehicle
socket remains lit for some time before
switching off. When the battery is fully charged:
X Unlock the vehicle.
Ý indicator lamp Aon vehicle
socket ?lights up green.
X Press and hold button Bon the charging
cable connector and remove the charging
cable from the vehicle socket.
X Close vehicle socket flap =.
X Close charge socket flap :.
X Remove the charging cable from the elec-
trical outlet.
X Stow the charging cable safely in the vehi-
cle (Y page 212). Charging the high-voltage battery
from the wallbox
General notes It is recommended that you charge your vehi-
cle using a wallbox or at a charging station.
Use the optional quick charging cable when
charging at a wallbox. The charging cable is
stored in a bag in the trunk.
Only use charging cables that have been tes- ted and approved by the manufacturer for
charging the high-voltage battery in an elec-
tric vehicle.
Pay attention to the "Important safety notes"
(Y page 209). Charging the high-voltage battery (plug-in hybrid vehicles)
215Driving and parking Z

Connecting the charging cable
:
To open the charge socket flap
; Fastener
= Vehicle charge socket flap
? Vehicle socket
A Indicator lamp Ý
X Use the DIRECT SELECT lever to shift the
automatic transmission to P.
X Switch the ignition off.
X Press the charge socket flap in the direc-
tion of arrow :.
The charge socket flap swings up.
X Slide fastener ;to the right.
Vehicle socket flap =is open.
X Insert the charging cable connector into
vehicle socket ?to the stop.
The high-voltage battery is being charged.
Ý indicator lamp Aon vehicle
socket ?flashes slowly green.
i The vehicle must not be moved during
charging or when the charging cable is con- nected. i
Depending on the temperature, the fan
and battery cooling system may audibly
switch on during the charging process.
Removing the charging cable When the charge level display reaches 100%
in the multifunction display, the battery is
fully charged (Y page 281).
i After the charging cable has been discon-
nected, the indicator lamp in the vehicle
socket remains lit for some time before
switching off. When the battery is fully charged:
X Unlock the vehicle.
Ý indicator lamp Aon vehicle
socket ?lights up green.
X Press and hold button Bon the charging
cable connector and remove the charging
cable from the vehicle socket.
X Close vehicle socket flap =.
X Close charge socket flap :. Charging the high-voltage battery at
the charging station
The connection for the vehicle at a charging
station is identical to the connection on a
wallbox. Read the "Charging a high-voltage
battery at a wallbox" section (Y page 215).
Before beginning the charging process at a
charging station without communication
capabilities, you must first activate the sta-
tion. You can do this by using an RFID card or 216
Charging the high-voltage battery (plug-in hybrid vehicles)Driving and parking

Display messages
Possible causes/consequences and
M
MSolutions Adaptive Highbeam
Adaptive Highbeam
Assist Assist
Plus
PlusInoper‐
Inoper‐
ative
ative Adaptive Highbeam Assist Plus is faulty.
X Visit a qualified specialist workshop. Adaptive Highbeam
Adaptive Highbeam
Assist Plus Cur‐ Assist Plus Cur‐
rently rently
Unavailable
Unavailable
See
See Operator's
Operator's Man‐
Man‐
ual
ual Adaptive Highbeam Assist Plus is deactivated and temporarily
inoperative. Possible causes are:
R the windshield in the camera's field of vision is dirty.
R visibility is impaired due to heavy rain, snow or fog.
X Clean the windshield.
If the system detects that the camera is fully operational, display
message Adaptive Adaptive Highbeam
HighbeamAssist
AssistPlus
PlusAvailable
Available Again
Again
is displayed.
Adaptive Highbeam Assist Plus is operational again. Engine
Display messages
Possible causes/consequences and
M MSolutions +
Check Coolant Check Coolant
Level See Opera‐ Level See Opera‐
tor's Manual tor's Manual 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.
X Add coolant, observing the warning notes before doing so
(Y page 408).
X If coolant needs to be added more often than usual, have the
engine coolant system checked at a qualified specialist work-
shop. ? ? The fan motor is faulty.
X At coolant temperatures below 257 ‡ (125 †), drive to the
nearest qualified specialist workshop.
X Avoid subjecting the engine to heavy loads, e.g. driving in moun-
tainous terrain, and stop-and-go traffic. 336
Display
messagesOn-board computer and displays