2008 MERCEDES-BENZ CLS COUPE coolant

Engine compartment
197
X
Top up the coolant if necessary.
X Replace cap 1 and tighten all the way to
the stop.
You will find further information about coolant
in the "Technical data" section
(Y page 316). Windscreen washer system/head-
lamp cleaning system*
The washer fluid reservoir is located in the
engine compartment on the right when
viewed in the direction of travel. The head-
lamp cleaning system* is also supplied from
the washer fluid reservoir.1 Cover X
Add windscreen washer concentrate to the
washer fluid all year round.
G Risk of fire
Windscreen washer concentrate is highly
flammable. Fire, naked flames and smoking
are prohibited when windscreen washer
concentrate is being handled.
Use
R a windscreen washer fluid additive
such as MB Summerwash to prevent
smearing (for temperatures above freez-
ing).
R a windscreen washer fluid additive with
antifreeze properties such as MB Winter-
wash (if there is a risk of frost).
X Mix the windscreen washer fluid in a con-
tainer beforehand. Adapt the mixing ratio
to the outside temperatures.
! Only use windscreen washer fluid which
is suitable for plastic lamp lenses. Unsuit-
able windscreen washer fluid could dam-
age the plastic lamp lenses of the head-
lamps. X
To open: pull cap 1 upwards by the tab.
X To close: press cap 1 onto the filler neck
until it clicks into place.
Operation
* optional
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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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Display messages
232 Display messages Possible cause/consequence Possible solution
D Coolant Stop vehi-
cle, turn engine
off The coolant is too hot. X
Stop the vehicle. Pay attention to the traffic
conditions as you do so.
X Switch off the engine.
X Wait until the display message disappears
before restarting the engine. There is other-
wise a risk of engine damage.
X Observe the coolant temperature gauge.
X If the temperature increases again, visit a quali-
fied specialist workshop immediately. D Coolant Stop vehi-
cle, turn engine
off The poly-V-belt may have torn. X
Stop the vehicle. Pay attention to the traffic
conditions as you do so.
X Switch off the engine.
X Check the poly-V-belt.
X If it is not damaged: do not start the engine
again until the display message goes out. There
is otherwise a risk of engine damage.
X If it has torn: do not drive on. Contact the
nearest qualified specialist workshop. Practical advice
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Display messages
233Display messages Possible cause/consequence Possible solution
B Top up coolant See
Owner's Manual The coolant level is too low. X
Top up the coolant, observing the warning
notes before doing so (Y page 196).
X Have the coolant system checked at a qualified
specialist workshop if the coolant needs top-
ping up more often than usual. . Dipped beam, left
or
Dipped beam, right The right-hand or left-hand dipped-beam
headlamp is faulty. X
Halogen headlamp: replace the bulb
(Y page 271).
X Bi-xenon headlamp*: visit a qualified special-
ist workshop. . AUTO lights inop-
erative The light sensor is faulty. Constant head-
lamp mode is switched on. X
Switch the lights to manual control in the on-
board computer ( Y page 125).
X Switch the lights on and off using the light
switch. . Rear left turn sig-
nal

Back-up bulb on
or
Rear right turn
signal Back-up
bulb on The rear left-hand or rear right-hand turn
signal is faulty.
This
display message will only appear if all
LEDs have failed. X
Visit a qualified specialist workshop. Practical advice
* optional
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Display messages
237Display messages Possible cause/consequence Possible solution
N Check engine oil
level when next
refuelling The engine oil level has dropped to a crit-
ical level. X
Check the engine oil level (Y page 195) and top
up the engine oil if necessary.
X Have the engine checked for leaks if the engine
oil needs topping up more often than usual. ± Display malfunc-
tion Consult work-
shop One or more electronic systems are
unable to deliver information to the on-
board computer. The following systems
may have failed:
R
Coolant temperature gauge
R Rev counter
R Cruise control or Speedtronic display X
Visit a qualified specialist workshop. H Tyre pressure Cau-
tion Tyre defect One or more tyres are losing air rapidly.
The affected wheel is highlighted in the
tyre pressure display of the tyre pressure
monitor*. X
Stop the vehicle without making any sudden
steering

or braking manoeuvres. Pay attention
to the traffic conditions as you do so.
X Repair or change the tyre (Y page 276). Practical advice
* optional
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Troubleshooting
246 Problem Possible cause/consequence Suggested solutions
l
The red distance warning
lamp* lights up while the
vehicle is in motion. You
will also hear a warning
tone. G
Risk of accident
You are approaching a vehicle in
front at too great a speed or Dis-
tronic*
has detected a stationary
obstacle in your line of travel. X
Be prepared to brake immediately.
X Pay careful attention to the traffic situation. You may have to brake
or take evasive action. D
The red coolant warning
lamp comes on while the
engine is running. There is insufficient coolant in the
expansion tank.
The coolant is too hot and the
engine is no longer being cooled
sufficiently. X
Stop the vehicle as soon as possible. Pay attention to the traffic
conditions as you do so.
X Allow the engine and coolant to cool.
X Check the coolant level. Observe the warning notes
(Y page 196). Top up the coolant if necessary.
X Have the coolant system checked at a qualified specialist work-
shop if the coolant needs topping up more often than usual. D
The red coolant warning
lamp comes on while the
engine is running. If the coolant level is correct, the
radiator fan may be faulty.
The coolant is too hot and the
engine is no longer being cooled
sufficiently. X
If the coolant temperature is less than 120†, you can continue
driving to the nearest qualified specialist workshop.
X In doing so, avoid heavy loads on the engine (e.g. driving in moun-
tainous terrain) and stop-and-go driving. Practical advice
* optional
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Troubleshooting
247Problem Possible cause/consequence Suggested solutions
D
The red coolant warning
lamp comes on while the
engine is running. You will
also hear a warning tone. The coolant level is too low.
The coolant temperature has
exceeded 120 †. The engine is
not being cooled sufficiently and
may be damaged. X
Stop the vehicle as soon as possible. Pay attention to the traffic
conditions as you do so.
X Allow the engine and coolant to cool.
X Check the coolant level. Observe the warning notes
(Y page 196). Top up the coolant if necessary.
X Have the coolant system checked at a qualified specialist work-
shop if the coolant needs topping up more often than usual. D
The red coolant warning
lamp comes on while the
engine is running. You will
also hear a warning tone. If the coolant level is correct, the
radiator fan may be faulty.
The coolant temperature has
exceeded 120 †. The engine is
not being cooled sufficiently and
may be damaged. X
Do not continue driving under any circumstances.
X Consult a qualified specialist workshop. ±
The yellow engine diagnos-
tics warning lamp comes
on
while the engine is run-
ning. Vehicles with a diesel engine: the
fuel tank has run dry. X
Start the engine three to four times after refuelling.
Emergency running mode is cancelled. The vehicle need not be
checked. Practical advice
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Troubleshooting
256 Problem Possible cause/consequence Suggested solutions
Vehicles with a petrol engine:
The engine is not running
smoothly and is misfiring. The engine electronics or a
mechanical component of the
engine control unit have been
damaged. X
Only depress the accelerator pedal slightly.
X Have the cause rectified immediately at a qualified specialist work-
shop.
Otherwise,
non-combusted fuel may get into the catalytic converter
and damage it. A coolant temperature of over
120 °C is displayed. The coolant
warning

lamp may also be on and
a warning tone may sound
(Y page 110). The coolant level is too low. The
coolant
is too hot and the engine
is no longer being cooled suffi-
ciently. X
Stop as soon as possible and allow the engine and the coolant to
cool down.
X Check the coolant level (Y page 196). Observe the warning notes
as you do so and top up the coolant if necessary. If the coolant level is correct, the
radiator fan may be faulty. The
coolant

is too hot and the engine
is no longer being cooled suffi-
ciently. X
If the coolant temperature is less than 120°C, you can continue
driving to the nearest qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. when driving on
mountain roads and stop/start driving. Practical advice
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