2014 MERCEDES-BENZ CLS-Class cooling

Setting the airflow
X Turn the SmartKey to position 2in the
ignition lock (Y page 147).
X To increase: press the000Bbutton.
X To reduce: press the0004button.
i You can use 3-zone automatic climate
control to set the airflow in the rear
compartmen tseparately.
If the batter yisnot sufficiently charged,
blower output may be reduced. As soon as
the batter yissufficiently charged, full blower
output will be available. Switching the ZONE function on/off
X To activate: press the0010button.
The indicator lamp above the 0010button
lights up.
Dual-zone automatic climate control: the
temperature setting for the driver's side is
not adopted for the front-passenger side.
3-zone automatic climate control: the
temperature setting for the driver's side is
not adopted for the front-passenger side
and the rear compartment.
X To deactivate: press the0010button.
The indicator lamp above the 0010button
goes out.
Dual-zone automatic climate control: the
temperature setting for the driver's side is
adopted for the front-passenger side.
3-zone automatic climate control: the
temperature setting for the driver's side is
adopted for the front-passenger side and
the rear compartment. Defrosting the windshield
You can use this function to defrost the
windshield or to defrost the inside of the
windshield and the side windows. Switc
hoff the "Windshield defrosting"
function as soon as the windshield is clear
again.
X Turn the SmartKey to position 2in the
ignition lock (Y page 147).
X To activate: press the0013button.
The indicator lamp in the 0013button lights
up.
The climate control system switches to the
following functions:
R high airflow
R high temperature
R air distribution to the windshield and
fron tside windows
R air-recirculation mode off
If the battery is not sufficiently charged,
blower output may be reduced. Onc ethe
battery is sufficiently charged again, full
blower output will be available again.
X To deactivate: press the0013button.
The indicator lamp in the 0013button goes
out. The previously selected settings are
restored. Air-recirculation mode remains
deactivated.
or
X Press the 000Dbutton.
The indicator lamp in the 0013button goes
out. Airflow and air distribution are set to
automatic mode.
or
X Dual-zon eautomatic climate control: turn
temperature controls 001Aor0025 clockwise
or counter-clockwise (Y page 131).
3-zon eautomatic climate control: turn
temperature controls 001Aor0025 clockwise
or counter-clockwise (Y page 134).
or
X Press the 000Bor0004 button. MAX COOL maximum cooling
The MAX COOL function is only available in
vehicles for the USA. Operating thec
limate control systems
139Climate control

MAX COOL is only operational when the
engine is running.
X
To activate: press the0019button.
The indicator lamp in the button lights up.
X To activate: press off-road button 0019
again.
The indicator lamp goes out. The previously
selected settings are restored.
When you activate MAX COOL, climate
control switches to the following functions:
R maximum cooling
R maximum airflow
R air-recirculation mode on Defrosting the windows
Windows fogged up on the inside X
Activate the 000Ccooling with air
dehumidification function.
X Activate automatic mode 000D.
X Adjust the side air ventssot hat the warmed
air is directed to the side windows.
X If the windows continue to fog up, activate
the "windshieldd efrosting" function
(Y page 139).
i You should only select this settingu ntil
the windshield is clear again.
Windows fogged up on the outside X
Press the 000Fbutton repeatedly until the
000E or001A symbol appears in the
display.
X Adjust the side air ventssot hat no air is
directed to the side windows. Rear window defroster
Activating/deactivating The rear window defroster has
ahigh current
draw. You should therefor eswitch 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.
X
Turn the SmartKey to position 2in the
ignition lock (Y page 147).
X Press the 0005button.
The indicator lamp in the 0005button lights
up or goes out. 140
Operating the climate control systemsClimate control

Problems with the rear window defroster
Problem Possible causes/consequences and
000B Solutions
The rear window
defroster has
deactivated
prematurely or cannot
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-
recirculation mode
Points to observe before use You can deactivate the flow of fresh air if
unpleasant odors are enteringt he vehicle
from outside. The air already inside the
vehicle will then be recirculated.
If you switch on air-recirculation mode, the
windows can fog up more quickly, in
particular at low temperatures. Only use air-
recirculation mode briefly to prevent the
windows from fogging up.
The operation of air-recirculation mode is the
same for all control panels.
Activating/deactivating X
Turn the SmartKey to position 2in the
ignition lock (Y page 147).
X To activate: press the0008button.
The indicator lamp in the 0008button lights
up.
i Dual-zone automatic climate control: air-
recirculation mode is automatically
activated at high outside temperatures.
3-zone automatic climate control: air-
recirculation mode is automatically
activated at high levels of pollution or at
high outside temperatures.
When air-recirculation mode is activated
automatically ,the indicator lamp above the 0008
button does not light up. Outside air
is added after about 30 minutes.
X To deactivate: press the0008button.
The indicator lamp in the 0008button goes
out.
i Air-recirculation mode deactivates
automatically:
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 dehumidification" function is
activated Activating/deactivating th
eresidual
heat function
The residual heat function is only available in
vehicles for Canada with 3-zon eautomatic
climate control.
It is possible to mak euse of the residual heat
of the engine to continue heatin gthe vehicle
for approximately 30 minutes after the engine
has been switched off .The heating time
depends on the temperature that has been
set. Operating the climate control systems
141Climatecontrol

X
Turn the SmartKey to position 0in the
ignition lock or remove it (Y page 147).
X To activate: press the0018button.
The indicator lamp in the 0018button lights
up.
i If the residual heat function is activated,
the windows may fog up on the inside.
i The blower will run at alow speed
regardless of the airflow setting.
i If you activat ethe residual heat function
at high temperatures, only the ventilation
will be activated. The blower runs at
medium speed.
X To deactivate: press the0018button.
The indicator lamp in the 0018button goes
out.
Residua lheat 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 result in burns or frostbite in
the immediate vicinit yofthe air vents. There
is ar isk of injury.
Make sure that all vehicle occupant salways
maintain asufficient distanc etothe air
outlets. 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 ventsi nto 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 ventsora ir intakegrilles
in the vehicle interior. Setting the center air vents
001A
Center air vent,l eft
0010 Center air vent,r ight
0024 Center vent thumbwheel, right
0021 Center vent thumbwheel, left
X To open/close: turn thumbwheels 0024
and 0021up or down. Setting the side air vents
001A
Defroster vent
0010 Side air vent
0024 Control for side air vent
X To open/close: turn thumbwheel 0024up or
down. Setting the glove box air vent
! Close the air vent when heating the
vehicle.
At high outside temperatures, open the air
vent and activat ethe "cooling with air 142
Setting the air ventsClimate control

Display messages Possible causes/consequences and
000B Solutions
Adaptive Highbeam
Assist Inoperative Adaptive Highbeam Assis
tisfaulty.
X Visit aqualified specialist workshop. Adaptive Highbeam
Assist Currently
Unavailable See
Operator's Manual Adaptive Highbeam Assist is deactivated and temporarily
inoperative. Possible causes are:
R
the windshieldint he camera's field of vision is dirty.
R visibility is impaired due to heavy rain, snow or fog.
X Cleant he windshield.
If the system detectst hat the camera is fully operational again,
the Adaptive Highbeam Assist Now Available message is
displayed.
Adaptive Highbeam Assist is operational again. Engine
Display messages Possible causes/consequencesa
nd000B Solutions
0016
Check Coolant
Level See
Operator'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 308).
X If coolant needs to be added more often than usual, have the
engine coolant system checked at aqualified specialist
workshop. 0017 The fan motor is faulty.
X
At coolant temperatures below 248 ‡(120 †), drive to the
nearest qualified specialist workshop.
X Avoid subjecting the engine to heavy loads, e.g. driving in
mountainous terrain, and stop-and-go traffic. 248
Display messagesOn-board computer and displays

Adding engin
eoil G
WARNING
If engin eoil comes int ocontac twithh ot
component sintheengin ecom partment, it
may ignite. There is ariskoff irea nd injury.
Mak esuret hate ngineo il is no tspilled next
to the filler neck. Let the engin ecool down
and thoroughly clean the engin eoil off the
component sbefore starting the engine. H
Environmental note
When adding oil, take care not to spill any. If
oil enters the soil or waterways, it is harmful
to the environment.
! Only use engin eoils and oil filter sthat
have been approved for vehicles with a
servic esystem. You can obtain alist of the
engin eoils and oil filter stested and
approved in accordance with the
Mercedes-Benz Specification sfor Service
Product satany Mercedes-Benz Service
center.
Damage to the engin eorexhaust system is
caused by the following:
R using engin eoils and oil filter sthat have
not been specifically approved for the
servic esystem
R replacing engin eoil and oil filter safter
the interval for replacemen tspecified by
the servic esystem has been exceeded
R using engin eoil additives.
! Do not add too much oil. adding too much
engin eoil can result in damage to the
engin eortot he catalytic converter. Have
excess engin eoil siphoned off. Example: engin
eoil cap
X Turn cap 001Acounter-clockwise and remove
it.
X Add engin eoil.
If the oil level is at or below the MIN mark
on the oil dipstick, add 1.1 US qt (1.0 liter)
of engine oil.
X Replace cap 001Aon the fille rneck and turn
clockwise.
Ensur ethatthe cap locks into place
securely.
X Check the oi llev el agai nwith the oil
dipstick (Y page 307).
Further information on engine oil
(Y page 375). Additiona
lservice products
Checking coolant level G
WARNING
The engine cooling system is pressurized,
particularly when the engine is warm. When
opening the cap, you could be scalde dbyhot
coolan tspraying out. There is arisk of injury.
Let the engin ecool down before openin gthe
cap. Wear eye and hand protection when
openin gthe cap. Open the cap slowly half a
turn to allow pressure to escape. 308
Engine compartmentMaintenance and care

Only use brake fluid approved by Mercedes-
Benz according to MB Approval 331.0.
Information abouta
pproved brake fluid can
be obtaine datany qualified specialist
workshop or on the Internet at
http://bevo.mercedes-benz.com.
i Have the brake fluid regularly replaced at
aq ualified specialist workshop and the
replacemen tconfirmed in the Maintenance
Booklet. Coolant
Important safety notes G
WARNING
If antifreez ecomes into contact with hot
components in the engine compartment, it
may ignite. There is arisk of fire and injury.
Let the engine cool down before you add
antifreeze. Make sure that antifreez eisnot
spilled next to the filler neck.T horoughly
clean the antifreeze from components before
startingt he engine.
! Only add coolant that has been premixed
with the desired antifreezep rotection. You
coul dotherwise damage the engine.
Further information on coolants can be
found in the Mercedes-Benz Specifications
for Service Products, MB Specifications for
Service Products 310.1, e.g. on the
Internet at
http://bevo.mercedes-benz.com .Or
contact aqualified specialist workshop.
! Always use asuitable coolant mixture,
even in countries where high temperatures
prevail.
Otherwise, the engine cooling system is not
sufficiently protected from corrosio nand
overheating.
Comply with the important safety precautions
for service products when handling coolant
(Y page3 73). The coolant is
amixture of water and
antifreeze/corrosion inhibitor. It performs
the following tasks:
R corrosio nprotection
R antifreeze protection
R raising the boiling point
If the coolant has antifreeze protection down
to -35 ‡(-37 †), the boiling point of the
coolant during operatio nisapproximately
266 ‡(130 †).
The antifreeze/corrosion inhibitor
concentration in the engine cooling system
should:
R be at least 50%. This will protect the engine
cooling system against freezing down to
approximately -35 ‡(-37 †).
R not exceed 55% (antifreeze protection
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
Service Products 310.1.
The coolant is checked with every
maintenance interval at aqualified specialist
workshop.
i When the vehicle is first delivered, it is
filled with acoolant mixture that ensures
adequate antifreeze and corrosion
protection.
Filling capacities Model Capacity
All models (except
for AMG vehicles)
Approx. 13.0 US qt
(12.3 l) All models (AMG
vehicles) Approx. 11.5 US qt
(10.9 l) i
Use MB 325.0 or MB 326.0 corrosion
inhibitor/antifreeze. Service products and filling capacities
377Technical data Z