2008 MERCEDES-BENZ CLS63AMG engine

376 Practical hints
What to do if …
During severe operation conditions and
stop-and-go city traffic, the coolant tem-
perature may rise close to 248°F (120°C).
Display symbolDisplay messagePossible cause/consequencePossible solution
DCoolant
Stop Vehicle,
turn engine off.The coolant is too hot.Stop the vehicle in a safe location or as soon
as it is safe to do so and immediately turn
off the engine.
Only start the engine again after the mes-
sage disappears. You could otherwise dam-
age the engine.
Apply the parking brake (page 53).
Observe the coolant temperature indicator
in the instrument cluster (
page 26).
If the temperature rises again:
Contact an authorized Mercedes-Benz
Center immediately.
Warning!G
Driving when your engine is badly overheat-
ed can cause some fluids which may have
leaked into the engine compartment to
catch fire. You could be seriously burned.
Steam from an overheated engine can cause
serious burns and can occur just by opening
the engine hood. Stay away from the engine
if you see or hear steam coming from it.
Stop the vehicle in a safe location away from
other traffic. Turn off the engine, get out of
the vehicle and do not stand near the vehicle
until the engine has cooled down.
!The engine should not be operated with the
coolant temperature above 248°F (120°C).
Doing so may cause serious damage which is not
covered by the Mercedes-Benz Limited
Warranty.

377 Practical hints
What to do if …
Display symbolDisplay messagePossible cause/consequencePossible solution
DCoolant
Stop Vehicle,
turn engine off.The poly-V-belt could be broken.Stop the vehicle in a safe location and immediately
turn off the engine.
Check the poly-V-belt.
If it is broken:
Do not continue to drive. Otherwise the engine will
overheat due to an inoperative water pump which
may result in damage to the engine. Notify an au-
thorized Mercedes-Benz Center.
If it is intact:
Do not continue to drive the vehicle with this mes-
sage displayed. Doing so could result in serious en-
gine damage that is not covered by the
Mercedes-Benz Limited Warranty.
Observe the coolant temperature indicator in the
instrument cluster (
page 26).
Drive immediately to the nearest authorized
Mercedes-Benz Center.

378 Practical hints
What to do if …
Display symbolDisplay messagePossible cause/consequencePossible solution
DThe cooling fan for the coolant is
malfunctioning.Observe the coolant temperature indicator in the
instrument cluster (
page 26).
If the coolant temperature is under 248°F (120°C),
you may continue driving to an authorized
Mercedes-Benz Center.
Avoid placing heavy loads on the engine (e.g. by
driving uphill) as well as stop-and-go traffic.
Have the fan replaced as soon as possible.
± Display Malfunction
Service RequiredCertain electronic systems are
unable to relay information to
the control system. The follow-
ing systems may have failed:

Coolant temperature display

Tachometer

Cruise control display
Have the electronic systems checked by an autho-
rized Mercedes-Benz Center.
Engine
ServiceThere may be a malfunction in:

the fuel injection system

the ignition system

the exhaust system
Have the engine checked as soon as possible by an
authorized Mercedes-Benz Center.

379 Practical hints
What to do if …
When the Check oil level at next re-
fueling.
message appears while the en-
gine is running and at operating
temperature, the engine oil level has
dropped to approximately the minimum
level.
When this occurs, the warning will first
come on intermittently and then stay on if
the oil level drops further.If no oil leaks are noted, continue to drive
to the nearest service station where the
engine oil should be topped to the required
level with an approved engine oil.
For information on approved engine oils,
refer to the Factory Approved Service
Products pamphlet (USA only) or contact
an authorized Mercedes-Benz Center.
Display symbolDisplay messagePossible cause/consequencePossible solution
: Check oil level
at next refueling
.
There is no oil in the engine. There is
a danger of engine damage.Check the engine oil level (page 288) and
add engine oil as required (
page 289).
If you must add engine oil frequently, have
the engine checked for possible leaks.
!The engine oil level warnings should not be
ignored. Extended driving with the symbol dis-
played could result in serious engine damage
that is not covered by the Mercedes-Benz Limit-
ed Warranty.

381 Practical hints
What to do if …
Display symbolDisplay messagePossible cause/consequencePossible solution
FPlease don’t
forget your key.This display appears (for a maximum of
60 seconds) if the driver’s door is opened
with the engine turned off and no
SmartKey in the starter switch.
This message is only a reminder.Take the SmartKey or SmartKey with
KEYLESS-GO* with you when leaving
the vehicle.
Change
Key BatteriesThe SmartKey with KEYLESS-GO* batter-
ies are discharged.Replace the batteries (page 402).
Key
Not DetectedThe SmartKey with KEYLESS-GO* is not
recognized while the engine is running
because

the SmartKey with KEYLESS-GO* is
not in the vehicle

there is strong radio-frequency inter-
ference
Stop the vehicle as soon as it is safe to
do so.
Search for the SmartKey.
Otherwise the vehicle cannot be cen-
trally locked nor can the engine be
started again after the engine is
stopped.
Key
Not DetectedThe SmartKey with KEYLESS-GO* is mo-
mentarily not recognized.Change the position of the SmartKey in
the vehicle.
Operate the vehicle with the SmartKey
in the starter switch if necessary.

412 Practical hints
Flat tire
Preparing the vehicle
Park the vehicle in a safe distance from
moving traffic on a hard, flat surface
when possible.
Turn on the hazard warning flashers.
Turn the steering wheel so that the
front wheels are in a straight ahead
position.
Set the parking brake.
Move the gear selector lever toP.
Turn off the engine (page 60).
Have any passenger exit the vehicle at
a safe distance from the roadway.
Vehicles with SmartKey: Remove the
SmartKey from the starter switch.
Vehicles with KEYLESS-GO*: Open the
driver’s door (this puts the starter
switch in position 0, same as with the
SmartKey removed from the starter
switch). The driver’s door then can be
closed again.
Mounting the spare wheel
iOpen door only when conditions are safe to
do so.
Warning!G
The dimensions of the spare wheel
(Minispare or collapsible tire) are different
from those of the road wheels. As a result,
the vehicle handling characteristics change
when driving with a spare wheel mounted.
Adapt your driving style accordingly.
The spare wheel is for temporary use only.
When driving with spare wheel mounted,
ensure proper tire pressure and do not ex-
ceed a vehicle speed of 50 mph (80 km/h).
Drive to the nearest Mercedes-Benz Center
as soon as possible to have the spare wheel
replaced with a regular road wheel.
Never operate the vehicle with more than
one spare wheel mounted.
Do not switch off the ESP
® when a Minis-
pare or collapsible tire is mounted.

415 Practical hints
Flat tire
Jack up the vehicle until the wheel is a
maximum of 1.2 in (3 cm) from the
ground. Never start engine while
vehicle is raised.Removing the wheel
1Alignment bolt
Unscrew the upper-most wheel bolt
and remove.
Replace this wheel bolt with alignment
bolt1 supplied in the tool kit.
Remove the remaining bolts.
Remove the wheel.Mounting the spare wheel
Clean contact surfaces of wheel and
wheel hub.
Guide the spare wheel onto the align-
ment bolt and push it on.
Insert wheel bolts and tighten them
slightly.
Warning!G
The jack is intended only for lifting the
vehicle briefly for wheel changes. It is not
suited for performing maintenance work
under the vehicle.

Never start the engine when the vehicle
is raised.

Never lie down under the raised vehicle.
!Do not place wheel bolts in sand or dirt. This
could result in damage to the bolt and wheel hub
threads.
Warning!G
Vehicles with collapsible tire:
Inflate collapsible tire only after the wheel is
properly mounted.
Inflate the collapsible tire using the electric
pump (
page 416) before lowering the
vehicle.
!To avoid paint damage, place wheel flat
against hub and hold it there while installing first
wheel bolt.

421 Practical hints
Battery
Disconnecting the battery
Depress parking brake firmly or move
gear selector lever to positionP.
Turn off all electrical consumers.
Remove SmartKey from starter switch.
Vehicles with KEYLESS-GO*:
Press the start/stop button until
the engine shuts off.
Open the driver’s door.
Open the trunk.
Read and observe safety instructions
and precautions (
page 420).
Remove the luggage box (page 397).
Disconnect battery negative lead2.
Remove cover1 from the positive ter-
minal.
Disconnect the battery positive lead.
Removing the battery
Remove the screw-nuts securing the
battery.
Remove the battery bracket.
Pull out the battery ventilation tube
from the battery (depending on battery
arrangement in your vehicle model, the
battery ventilation tube is located on
the left or right side of the battery).
Take out the battery.
!As with any other battery, disconnect the
battery if you do not intend to operate your vehi-
cle for an extended period of time to prevent bat-
tery discharge or connect an accessory battery
charge unit expressly approved by
Mercedes-Benz for your vehicle model to main-
tain the battery charge. Contact an authorized
Mercedes-Benz Center for further information.
The battery, the battery ventilation hose and the
lateral plug must always be securely installed
when the vehicle is in operation.
!Never loosen or detach battery terminal
clamps while the engine is running or the
SmartKey is in the starter switch. Otherwise the
alternator and other electronic components
could be severely damaged.
Have the battery checked regularly by an autho-
rized Mercedes-Benz Center.
Refer to Maintenance Booklet for maintenance
intervals or contact your authorized
Mercedes-Benz Center for further information.
Warning!G
With a disconnected battery

you will no longer be able to turn the
SmartKey in the starter switch and
pressing the KEYLESS-GO* start/stop
button on the gear selector lever will
have no effect

the gear selector lever will remain
locked in positionP