2005 MERCEDES-BENZ G55AMG engine

305 Practical hints
What to do if …
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Possible cause
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B
COOLANT
CHECK LEVEL!
The coolant level is too low.

Add coolant (
page 244).

If you have to add coolant frequently,
have the cooling system checked by
an authorized Mercedes-Benz Light
Truck Center.
Warning!
G
Do not spill antifreeze on hot engine parts.
Antifreeze contains ethylene glycol which
may burn if it comes into contact with hot
engine parts. You could be seriously burned.
!Do not ignore the low engine coolant
level warning. Extended driving with
the message and symbol displayed
may cause serious engine damage not
covered by the Mercedes-Benz Limited
Warranty.
Do not drive without sufficient amount
of coolant in the cooling system. The
engine will overheat causing serious
engine damage.
Observe the coolant temperature dis-
play (
page 120).

306 Practical hintsWhat to do if …
During severe operating conditions and
stop-and-go city traffic, the coolant tem-
perature may rise close to 248°F (120°C).
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Display message
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Ï
COOLANT
STOP, ENGINE OFF!
The coolant is too hot.

Stop the vehicle and turn off the en-
gine.

Only start the engine again after the
message disappears. You could other-
wise damage the engine.
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 hood. Stay away from the engine if you
see or hear steam coming from it.
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
engine damage which is not covered by
the Mercedes-Benz Limited Warranty.

307 Practical hints
What to do if …
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Possible cause
Possible solution
Ï
COOLANT
STOP, ENGINE OFF!
The poly-V-belt could be broken.

Stop immediately and 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 re-
sult in damage to the engine. Notify an
authorized Mercedes-Benz Light Truck
Center.
If it is in order:

Do not continue to drive the vehicle
with this message displayed. Doing so
could result in serious engine damage
that is not covered by the
Mercedes-Benz Limited Warranty.

Observe the coolant temperature
display (
page 120).

Drive immediately to the nearest au-
thorized Mercedes-Benz Light Truck
Center.

308 Practical hintsWhat to do if …Ï
COOLANT
VISIT WORKSHOP!
The cooling fan for the coolant is
malfunctioning.

Observe the coolant temperature dis-
play (
page 120).

Have the fan replaced as soon as pos-
sible.
Ñ
CRUISE CONTROL
VISIT WORKSHOP!
Cruise control is malfunctioning.

Visit an authorized Mercedes-Benz
Light Truck Center.
J
DOOR OPEN!
You are attempting to drive with one ore
more doors open.

Close the doors.
e
ENGINE AIR FILTER
VISIT WORKSHOP!
The engine air filter is clogged and must
be replaced.

Visit an authorized Mercedes-Benz
Light Truck Center as soon as possi-
ble.
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Possible cause
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309 Practical hints
What to do if …
When the
ADD 1.0 QT. ENG. OIL
- WHEN
NEXT REFUELLING!
(Canada:
1.0 LITER
)
message appears while the engine is run-
ning and at operating temperature, the en-
gine 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.
Visually check for oil leaks. If no obvious oil
leaks are noted, drive to the nearest ser-
vice station where the engine oil should be
topped to the required level with an ap-
proved oil specified in the Factory
Approved Service Products pamphlet.
Display symbol
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Possible cause
Possible solution
:
USA only:ADD 1.0 Qt. ENGINE OIL
WHEN NEXT REFUELING!Canada only:ADD 1.0 LITER ENG. OIL
WHEN NEXT REFUELING!
The engine oil level is too low.

Add engine oil (
page 243) and check
the engine oil level (
page 240).
!The engine oil level warnings should
not be ignored. Extended driving with
the symbol displayed could result in
serious engine damage that is not
covered by the Mercedes-Benz Limited
Warranty.

310 Practical hintsWhat to do if …Display symbol
Display message
Possible cause
Possible solution
:
ENGINE OIL LEVEL
REDUCE OIL LEVEL!
You have added too much engine oil.
There is a risk of damaging the engine or
the catalytic converter.

Have oil siphoned or drained off. Ob-
serve all legal requirements with re-
spect to its disposal.
ENGINE OIL LEVEL
STOP, ENGINE OFF!
There is no oil in the engine. There is a
danger of engine damage.

Carefully bring the vehicle to a halt as
soon as possible.

Turn off the engine.

Add engine oil (
page 243) and check
the engine oil level (
page 240).
ENGINE OIL
VISIT WORKSHOP!
It may be that there is water in the engine
oil.

Have the oil checked.
ENGINE OIL LEVEL
VISIT WORKSHOP!
The engine oil has dropped to a critical
level.

Check the engine oil level
(page 240) and add oil as required
(page 243).

If you must add engine oil frequently,
have the engine checked for possible
leaks.
The measuring system is malfunctioning.

Have the measuring system checked
by an authorized Mercedes-Benz Light
Truck Center.

314 Practical hintsWhat to do if …Display symbol
Display message
Possible cause
Possible solution
.
LIGHT SENSOR
DRIVE TO WORKSHOP!
The lamp sensor is malfunctioning. The
headlamps switch on automatically.

In the control system, set lamp opera-
tion to manual (
page 137).

Switch on headlamps using the
exterior lamp switch (
page 110).

Visit an authorized Mercedes-Benz
Light Truck Center as soon as possi-
ble.
LICENSE PLATE LIGHT, L
CHECK LIGHT!

The left license plate lamp is malfunction-
ing.

Replace the bulb as soon as possible.
LICENSE PLATE LIGHT R
CHECK LIGHT!

The right license plate lamp is malfunc-
tioning.

Replace the bulb as soon as possible.
LIGHTS
TURN OFF LIGHTS!
The display appears if the driver’s door is
opened with the engine shut off and no
SmartKey in the starter switch.

Insert SmartKey in the starter switch.

Switch off the lights (
page 110).
LOW BEAM, L
CHECK LIGHT!
The left low beam lamp is malfunctioning.

Visit an authorized Mercedes-Benz
Light Truck Center as soon as
possible.
LOW BEAM, R
CHECK LIGHT!
The right low beam lamp is malfunction-
ing.

Visit an authorized Mercedes-Benz
Light Truck Center as soon as
possible.

348 Practical hintsFlat tirePump handle (three pieces)1Indent for activation of release bolt2
Assemble the pump handle for the
jack. The pump handle is located in the
vehicle tool kit.
Jack2Release bolt
Close release bolt2.
To do so, turn indent1 to the right in
the pump lever until its stop.

Place jack on firm ground.

Position jack under the axle housing,
so that it is always vertical (plumb-line)
as seen from the side, even if the vehi-
cle is parked on an incline.
Be certain the jack arm is positioned
correctly under the axle housing (axle
must fall into jack contour).

Jack up the vehicle by pumping (arrow)
until the wheel is clear of the ground.
Never start engine while vehicle is
raised.
iNever turn release bolt2 more than
one or two revolutions. Hydraulic fluid
can otherwise escape.