2014 MERCEDES-BENZ CLS cooling

Problems with the "Cooling with air dehumidification" function
ProblemPossible causes/consequences andSolutions
The indicator lamp in
thebutton
flashes three times or
remains off. The
"Cooling with air
dehumidification"
function cannot be
switched on.
Cooling with air dehumidification has been deactivated due to a
malfunction.
XVisitaqualified specialist workshop.
Setting climate control to automatic
Points to observe before use
In automatic mode, the set temperature is
maintained automatically ataconstant level.
The system automatically regulates the
temperature of the dispensed air, the airflow
and the air distribution.
The automatic mode functions optimally
when the "Cooling with air dehumidification"
function is activated. If necessary, cooling
with air dehumidification can be deactivated.
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,
deactivate the cooling with air-
dehumidification function only briefly.
Activating/switching
XTurn the SmartKey to position2in the
ignition lock (Ypage 147).
XSet the desired temperature.
XTo activate:press the\rbutton.
The indicator lamp in the\rbutton lights
up. Automatic air distribution and airflow
are activated.
i3-zone automatic climate control: when
automatic mode is activated, you can
selectaclimate mode (Ypage 137).
XTo switch to manualmode:press the
button.
or
XPress theorbutton.
The indicator lamp in the\rbutton goes
out.
Adjusting the climate mode settings
The "Set climate mode" function is only
available with 3-zone automatic climate
control.
You can select the following climate mode
settings in automatic mode:
FOCUS high airflow that is set slightly
cooler
MEDIUM medium airflow, standard setting
DIFFUSE low airflow that is set slightly
warmer and with less draft
XTurn the SmartKey to position2in the
ignition lock (Ypage 147).
XPress the\rbutton.
XPress thebutton repeatedly until the
desired climate mode appears in the
display.
Operating the climate control systems137
Climate control

Setting the airflow
XTurn the SmartKey to position2in the
ignition lock (Ypage 147).
XTo increase:press thebutton.
XTo reduce:press thebutton.
iYou can use 3-zone automatic climate
control to set the airflow in the rear
compartmentseparately.
If the batteryisnot sufficiently charged,
blower output may be reduced. As soon as
the batteryissufficiently charged, full blower
output will be available.
Switching the ZONE function on/off
XTo activate:press thebutton.
The indicator lamp above thebutton
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.
XTo deactivate:press thebutton.
The indicator lamp above thebutton
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.
Switchoff the "Windshield defrosting"
function as soon as the windshield is clear
again.
XTurn the SmartKey to position2in the
ignition lock (Ypage 147).
XTo activate:press thebutton.
The indicator lamp in thebutton lights
up.
The climate control system switches to the
following functions:
Rhigh airflow
Rhigh temperature
Rair distribution to the windshield and
frontside windows
Rair-recirculation mode off
If the battery is not sufficiently charged,
blower output may be reduced. Oncethe
battery is sufficiently charged again, full
blower output will be available again.
XTo deactivate:press thebutton.
The indicator lamp in thebutton goes
out. The previously selected settings are
restored. Air-recirculation mode remains
deactivated.
or
XPress the\rbutton.
The indicator lamp in thebutton goes
out. Airflow and air distribution are set to
automatic mode.
or
XDual-zoneautomatic climate control: turn
temperature controlsor%clockwise
or counter-clockwise (Ypage 131).
3-zoneautomatic climate control: turn
temperature controlsor%clockwise
or counter-clockwise (Ypage 134).
or
XPress theorbutton.
MAX COOL maximum cooling
The MAX COOL function is only available in
vehicles for the USA.
Operating theclimate control systems139
Climate control

MAX COOL is only operational when the
engine is running.
XTo activate:press thebutton.
The indicator lamp in the button lights up.
XTo activate:press off-road button
again.
The indicator lamp goes out. The previously
selected settings are restored.
When you activate MAX COOL, climate
control switches to the following functions:
Rmaximum cooling
Rmaximum airflow
Rair-recirculation mode on
Defrosting the windows
Windows fogged up on the inside
XActivate thecooling with air
dehumidification function.
XActivate automatic mode\r.
XAdjust the side air ventssothat the warmed
air is directed to the side windows.
XIf the windows continue to fog up, activate
the "windshielddefrosting" function
(Ypage 139).
iYou should only select this settinguntil
the windshield is clear again.
Windows fogged up on the outside
XPress thebutton repeatedly until the
orsymbol appears in the
display.
XAdjust the side air ventssothat no air is
directed to the side windows.
Rear window defroster
Activating/deactivating
The rear window defroster hasahigh current
draw. You should thereforeswitch 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.
XTurn the SmartKey to position2in the
ignition lock (Ypage 147).
XPress thebutton.
The indicator lamp in thebutton lights
up or goes out.
140Operating the climate control systems
Climate control

Problems with the rear window defroster
ProblemPossible causes/consequences andSolutions
The rear window
defroster has
deactivated
prematurely or cannot
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.
Activating/deactivating air-
recirculation mode
Points to observe before use
You can deactivate the flow of fresh air if
unpleasant odors are enteringthe 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
XTurn the SmartKey to position2in the
ignition lock (Ypage 147).
XTo activate:press thebutton.
The indicator lamp in thebutton lights
up.
iDual-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
button does not light up. Outside air
is added after about 30 minutes.
XTo deactivate:press thebutton.
The indicator lamp in thebutton goes
out.
iAir-recirculation mode deactivates
automatically:
Rafter approximately five minutes at
outside temperatures below
approximately 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 air dehumidification" function is
activated
Activating/deactivating theresidual
heat function
The residual heat function is only available in
vehicles for Canada with 3-zoneautomatic
climate control.
It is possible to makeuse of the residual heat
of the engine to continue heatingthe 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 systems141
Climat ec ontrol

XTurn the SmartKey to position0in the
ignition lock or remove it (Ypage 147).
XTo activate:press thebutton.
The indicator lamp in thebutton lights
up.
iIf the residual heat function is activated,
the windows may fog up on the inside.
iThe blower will run atalow speed
regardless of the airflow setting.
iIf you activatethe residual heat function
at high temperatures, only the ventilation
will be activated. The blower runs at
medium speed.
XTo deactivate:press thebutton.
The indicator lamp in thebutton goes
out.
Residualheat is deactivated automatically:
Rafter approximately 30 minutes
Rwhen the ignition is switched on
Rif the battery voltage drops
Setting the 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 vicinityofthe air vents. There
isarisk of injury.
Make sure that all vehicle occupantsalways
maintainasufficient distancetothe 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 ventsinto 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 ventsorair intakegrilles
in the vehicle interior.
Setting the center air vents
Center air vent,left
Center air vent,right
$Center vent thumbwheel, right
!Center vent thumbwheel, left
XTo open/close:turn thumbwheels$
and!up or down.
Setting the side air vents
Defroster vent
Side air vent
$Control for side air vent
XTo open/close:turn thumbwheel$up 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 activatethe "cooling with air
142Setting the air vents
Climate control

Display messagesPossible causes/consequences andSolutions
Adaptive Highbeam
Assist Inoperative
Adaptive Highbeam Assistisfaulty.
XVisitaqualified specialist workshop.
Adaptive Highbeam
Assist Currently
Unavailable See
Operator's Manual
Adaptive Highbeam Assist is deactivated and temporarily
inoperative. Possible causes are:
Rthe windshieldinthe camera's field of vision is dirty.
Rvisibility is impaired due to heavy rain, snow or fog.
XCleanthe windshield.
If the system detectsthat the camera is fully operational again,
theAdaptive Highbeam Assist Now Availablemessage is
displayed.
Adaptive Highbeam Assist is operational again.
Engine
Display messagesPossible causes/consequencesandSolutions

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.
XAdd coolant, observing the warning notes before doing so
(Ypage 308).
XIf coolant needs to be added more often than usual, have the
engine coolant system checked ataqualified specialist
workshop.
The fan motor is faulty.
XAt coolant temperatures below 248‡(120 †), drive to the
nearest qualified specialist workshop.
XAvoid subjecting the engine to heavy loads, e.g. driving in
mountainous terrain, and stop-and-go traffic.
248Display messages
On-board computer and displays

Adding engineoil
GWARNING
If engineoil comes intocontactwithhot
componentsintheenginecompartment, it
may ignite. There isariskoffireand injury.
Makesurethatengineoil is notspilled next
to the filler neck. Let the enginecool down
and thoroughly clean the engineoil off the
componentsbefore starting the engine.
HEnvironmental 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 engineoils and oil filtersthat
have been approved for vehicles with a
servicesystem. You can obtainalist of the
engineoils and oil filterstested and
approved in accordance with the
Mercedes-Benz Specificationsfor Service
Productsatany Mercedes-Benz Service
center.
Damage to the engineorexhaust system is
caused by the following:
Rusing engineoils and oil filtersthat have
not been specifically approved for the
servicesystem
Rreplacing engineoil and oil filtersafter
the interval for replacementspecified by
the servicesystem has been exceeded
Rusing engineoil additives.
!Do not add too much oil. adding too much
engineoil can result in damage to the
engineortothe catalytic converter. Have
excess engineoil siphoned off.
Example: engineoil capXTurn capcounter-clockwise and remove
it.
XAdd engineoil.
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.
XReplace capon the fillerneck and turn
clockwise.
Ensurethatthe cap locks into place
securely.
XCheck the oillevel againwith the oil
dipstick (Ypage 307).
Further information on engine oil
(Ypage 375).
Additionalservice products
Checking coolant level
GWARNING
The engine cooling system is pressurized,
particularly when the engine is warm. When
opening the cap, you could be scaldedbyhot
coolantspraying out. There isarisk of injury.
Let the enginecool down before openingthe
cap. Wear eye and hand protection when
openingthe cap. Open the cap slowly half a
turn to allow pressure to escape.
308Engine compartment
Maintenance and care

Only use brake fluid approved by Mercedes-
Benz according to MB Approval 331.0.
Information aboutapproved brake fluid can
be obtainedatany qualified specialist
workshop or on the Internet at
http://bevo.mercedes-benz.com.
iHave the brake fluid regularly replaced at
aqualified specialist workshop and the
replacementconfirmed in the Maintenance
Booklet.
Coolant
Important safety notes
GWARNING
If antifreezecomes into contact with hot
components in the engine compartment, it
may ignite. There isarisk of fire and injury.
Let the engine cool down before you add
antifreeze. Make sure that antifreezeisnot
spilled next to the filler neck.Thoroughly
clean the antifreeze from components before
startingthe engine.
!Only add coolant that has been premixed
with the desired antifreezeprotection. You
couldotherwise 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
contactaqualified specialist workshop.
!Always useasuitable coolant mixture,
even in countries where high temperatures
prevail.
Otherwise, the engine cooling system is not
sufficiently protected from corrosionand
overheating.
Comply with the important safety precautions
for service products when handling coolant
(Ypage373).
The coolant isamixture of water and
antifreeze/corrosion inhibitor. It performs
the following tasks:
Rcorrosionprotection
Rantifreeze protection
Rraising the boiling point
If the coolant has antifreeze protection down
to -35‡(-37†),the boiling point of the
coolant during operationisapproximately
266‡(130 †).
The antifreeze/corrosion inhibitor
concentration in the engine cooling system
should:
Rbe at least 50%. This will protect the engine
cooling system against freezing down to
approximately -35‡(-37 †).
Rnot 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 ataqualified specialist
workshop.
iWhen the vehicle is first delivered, it is
filled withacoolant mixture that ensures
adequate antifreeze and corrosion
protection.
Filling capacities
ModelCapacity
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)
iUse MB 325.0 or MB 326.0 corrosion
inhibitor/antifreeze.
Service products and filling capacities377
Technical data
Z