2008 MERCEDES-BENZ CLS COUPE cooling

Air conditioning
163
The symbols for the air distribution have the
following meanings: Symbol Meaning
Z
Directs the airflow through the
centre,
side and demister vents
to the windscreen and side win-
dows a
Directs the airflow through the
centre and side air vents
X
Directs the airflow to the entire
vehicle interior
Y
Directs the airflow to the centre
and side air vents and to the
front and rear footwells
X
Turn thumbwheel 1 or 7 to the corre-
sponding
symbol (Y page 155). The thumb-
wheel can also be turned to the area
between two symbols. Setting the airflow
X To increase/reduce: press the Q or
· button. Demisting the windscreen
i You should only select the "demisting"
function

until the windscreen is clear again.
X To activate: press the y button.
The indicator lamp in the y button
comes on.
The system automatically switches to the
following functions:
R cooling with air dehumidification on
R high airflow 24
R high temperature 24
R air distribution to the windscreen and
front side windows
R air-recirculation mode off
X To deactivate: press the y button.
The
indicator lamp in the y button goes
out. The previously selected settings come
into effect again. The cooling with air dehu- midification function remains on. Air-recir-
culation mode remains deactivated.
or
X Press the U button.
The
indicator lamp in the y button goes
out. Airflow and air distribution are set to
automatic mode.
or
X 2-zone Thermatic only: turn thumbwheel
1 or 7 clockwise or anti-clockwise
(Y page 153).
or
X 2-zone Thermatic only: press
the Q or
· button.
24 Depending on the outside temperature. Controls
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Air conditioning
164 Windows misted up
Windows misted up on the inside X
Activate the "cooling function with air-
dehumidification" function.
X Activate the automatic mode.
X If the windows continue to mist up, activate
the "demisting" function.
Windows misted up on the outside X
Activate the windscreen wipers.
X 2-zone Thermatic: press and hold the
© or ª button until the a, Ú
or Y symbol is shown in the display.
X 4-zone Thermotronic*: turn the thumb-
wheel for air distribution to the Y or
a symbol.
i You should only select this setting until
the windscreen is clear again. Switching the rear window heating
on/off
G
Risk of accident
Clear all windows of ice or snow before set-
ting off. Impaired visibility could otherwise
endanger yourself and others.
i At very low temperatures, the rear win-
dow heating is only switched on once the
vehicle interior has warmed up.
i The rear window heating has a high cur-
rent draw. You should therefore switch it
off
as soon as the window is clear, as it only
switches itself off automatically after
between six and twenty minutes.
i If the battery voltage is too low, the rear
window heating may switch off.
X Make sure that the key is in position 2 in
the ignition lock.
X Press the ¯ button.
The
indicator lamp in the ¯ switch lights
up or goes out. Activating/deactivating air-recircula-
tion mode
You can deactivate the flow of fresh air if
unpleasant odours are entering the vehicle
from outside. The air already inside the vehi-
cle will then be recirculated. G
Risk of accident
Only switch over to air-recirculation mode
briefly
at low outside temperatures. Other-
wise, the windows could mist up, thus
impairing visibility and endangering your-
self and others. This may prevent you from
observing the traffic conditions, thereby
causing an accident.
X To activate: press the , button.
The indicator lamp in the , button
comes on.
i Air-recirculation mode is activated auto-
matically at high outside temperatures.
When air-recirculation mode is activated
automatically, the indicator lamp in
the , button is not lit.
Outside air is added after about 30
minutes. Controls
* optional
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Engine compartment
196Example of a vehicle with a diesel engine (CLS 320
CDI)
1
Cover
X Unscrew cap 1 and remove it.
X Top up by the amount of oil required.
! Do not add too much oil. If too much oil
is added, there is a risk of damage to the
engine or the catalytic converter.
X Screw cap 1 onto the filler neck.
H Environmental note
When topping up the oil, take care not to
spill any. Oil must not be allowed to escape
into the soil or waterways. You would oth-
erwise be damaging the environment.
Coolant
G Risk of injury
The cooling system is pressurised. There-
fore, only unscrew the cap once the engine
has cooled down. The coolant temperature
gauge must display less than 70°C. You
could otherwise be scalded by escaping hot
coolant.
Coolant consists of water and antifreeze/cor-
rosion inhibitor. Only check the coolant level
when the vehicle is on a level surface and the
engine has cooled down. Checking the coolant levelThe expansion tank is located in the engine
compartment on the left when viewed in the
direction of travel.
1
Cover
2 Expansion tank
3 Marker bar
X Slowly turn cap 1 by half a turn anti-clock-
wise to allow excess pressure to escape.
X Turn cap 1 further anti-clockwise and
remove it.
There is sufficient coolant in expansion
tank 2 if the coolant is level with marker
bar 3 in the filler neck when cold or
approximately 1.5 cm higher when hot.
Operation
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Display messages
229Display messages Possible cause/consequence Possible solution
V At least one door is open. The display
symbol shows you which doors are open. X
Close the doors. D The cooling fan for the coolant is faulty. X
If the coolant temperature is less than 120†,
you can continue driving to the nearest quali-
fied specialist workshop.
X In doing so, avoid heavy loads on the engine
(e.g. driving in mountainous terrain) and stop-
and-go driving. @ Vehicle rising
Vehicles with AIRMATIC Dual Control*:
your vehicle is adjusting to the level you
have selected.
@ Vehicle rising
Please wait
Vehicles with AIRMATIC Dual Control*:
the
vehicle level is too low when the vehi-
cle is stationary. X
Do not pull away.
X Wait until the display message disappears.
The vehicle has reached the level required for
driving. Practical advice
* optional
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Troubleshooting
242 Problem Possible cause/consequence Suggested solutions
The steering wheel heating* indi-
cator
lamp on the lower left lever
of the steering column is flashing. There is insufficient voltage
because
too many consumers are
switched on. The steering wheel
heating* has switched itself off
automatically. X
Switch off consumers that are not required, e.g. reading lamps,
interior lighting, etc.
The steering wheel heating*
will automatically switch back on as
soon as there is sufficient voltage again. The indicator lamp in the
2
button on the Thermatic/4-zone
Thermotronic* control panel
flashes three times when you
press

the button. The cooling sys-
tem cannot be switched on. Cooling has been deactivated
due to a malfunction. X
Visit a qualified specialist workshop. The indicator lamp in the
¯
rear-window heating button is
flashing. The rear-window heat-
ing

has switched itself off prema-
turely or cannot be switched on. There is insufficient voltage
because
too many consumers are
switched on. X
Switch off consumers that are not required, e.g. reading lamps,
interior lighting, etc.
The
rear-window heating will automatically switch back on as soon
as there is sufficient voltage again. Vehicles with automatic child
seat recognition on the front-
passenger seat*:
The 5 PASSENGER AIRBAG
OFF warning lamp on the centre
console is lit. A special Mercedes-Benz child
seat with automatic child seat
recognition

has been fitted to the
front-passenger seat. The front-
passenger airbag has therefore
been disabled. Practical advice
* optional
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Service products and capacities
316 Coolant
The coolant is a mixture of water and anti-
freeze/corrosion inhibitor. It performs the
following tasks:
R anti-corrosion protection
R antifreeze protection
R raising the boiling point
i When the vehicle is first delivered, it is
topped up with a coolant that will ensure
adequate antifreeze and corrosion protec-
tion.
! Only top up with coolant that has been
premixed
with the desired quantity of anti-
freeze protection. You could otherwise
damage the engine.
There is more information about coolant
and topping it up on Mercedes-Benz Spec-
ifications for Service Products Sheet
310.1.
! Always use a suitable coolant mixture,
even in countries where high temperatures
prevail.
Otherwise, the cooling system will not be
sufficiently protected from corrosion, and
the boiling point will be too low. If antifreeze/corrosion inhibitor is present in
the
correct concentration, the boiling point of
the coolant will be around 130 °C.
The antifreeze/corrosion inhibitor concentra-
tion in the cooling system should:
R be at least 50%. This will protect the cooling
system against freezing down to around –
37 °C.
R not exceed 55% concentration (antifreeze
protection down to –45 °C), otherwise heat
will not be effectively dissipated.
If the vehicle has lost coolant, top it up with
equal amounts of water and antifreeze/cor-
rosion inhibitor. Mercedes-Benz recom-
mends using an antifreeze/corrosion inhibi-
tor which has been approved for Mercedes-
Benz.
! The cooling system contains a lifetime
supply which must be renewed after 15
years, or after 250, 000 km at the latest.
Have the renewal confirmed in the Service
Booklet.
The warranty is only valid if you top up with
an antifreeze/corrosion inhibitor which
has been approved by Mercedes-Benz. Technical data
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Service products and capacities
317
Capacities The following values indicate the total cooling system capacities.
CLS 280
CLS 350
54 CLS 350 CGI
54 CLS 500 CLS 63 AMG CLS 320 CDI
Coolant 10.0 l 10.0 l 12.0 l 11.3 l 11.8 l 12.6 l
Amount of antifreeze/corrosion inhibitor required for antifreeze protection
Down to –37 °
C (approxi-
mately 50%) 5.0 l 5.0 l 6.0 l 5.7 l 5.9 l 6.3 l
Down to –45 °
C (approxi-
mately 55%) 5.5 l 5.5 l 6.6 l 6.2 l 6.5 l 6.9 l
Brake fluid
Over a period of time, the brake fluid absorbs
moisture from the air; this lowers its boiling
point. G
Risk of accident
If the boiling point of the brake fluid is too
low,
vapour pockets may form in the brake
system when the brakes are applied hard
(e.g. when driving downhill). This would
impair braking efficiency. Have the brake fluid renewed every two
years with a brake fluid that has been
approved by Mercedes-Benz and have this
confirmed in the Service Booklet.
i There is usually a notice in the engine
compartment

to remind you when the next
brake fluid change is due. Windscreen washer system
The washer fluid reservoir holds approxi-
mately 4.5 litres; on vehicles with the head-
lamp cleaning system* it holds 7 litres.
The headlamp cleaning system*
and the
windscreen washer system are both supplied
from the washer fluid reservoir.
X At temperatures above freezing point:
54 Only for certain countries. Technical data
* optional
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