2004 MERCEDES-BENZ G55AMG coolant

269 Practical hints
What 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).
Display symbol
Display message
Possible cause
Possible solution
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.

270 Practical hintsWhat to do if …Display symbol
Display message
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 in-
operative water pump which may re-
s u l t i n d a m a g e t o t he e n g i n e . N ot i f y a n
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.
COOLANT
VISIT WORKSHOP!
The cooling fan for the coolant is malfunc-
tioning.

Observe the coolant temperature dis-
play (
page 112).

Have the fan replaced as soon as pos-
sible.

282 Practical hintsWhat to do if …Display
Possible cause
Possible solution
Ê
TRUNK OPEN!
This message will appear whenever the
tailgate is open.

Close the tailgate.
G
VISIT WORKSHOP!
DISPLAY MALFUNCTION:
The instrument cluster display is malfunc-
tioning.
Some systems themselves may also have
failed.

Continue driving with added caution.

Visit an authorized Mercedes-Benz
Light Truck Center as soon as
possible.
±
VISIT WORKSHOP!
DISPLAY MALFUNCTION:
Certain electronic systems are unable to
relay information to the control system.
The following systems may have failed:

Coolant temperature display


Tachometer


Cruise control display

Have the electronic systems checked
by an authorized Mercedes-Benz Light
Truck Center.
W
WASHER FLUID
CHECK LEVEL!
The fluid level has dropped to about
1/3
of total reservoir capacity.
Add washer fluid (
page 339).

323 Technical data
Spare parts service
Warranty coverage
Identification labels
Layout of poly-V-belt drive
Engine
Rims and tires
Electrical system
Main dimensions, vehicle weights and ratings
Fuels, coolants, lubricants, etc.
Consumer information

327 Technical data
Layout of poly-V-belt drive
Layout of poly-V-belt drive
For dimensions of the poly-V-belt, see
technical data (
page 328).
G500/G55AMG
1Automatic belt tensioner
2Power steering pump
3Air conditioning compressor
4Crankshaft
5Coolant pump
6Generator (alternator)
7Idler pulley

333 Technical data
Fuels, coolants, lubricants, etc.
Fuels, coolants, lubricants, etc.
Capacities
Vehicle components and their respective
lubricants must match.Therefore use only brands tested and ap-
proved by Mercedes-Benz.Please refer to the Factory Approved Ser-
vice Products pamphlet, or inquire at your
Mercedes-Benz Light Truck Center.
Model
Capacity
Fuels, coolants, lubricants, etc.
Engine with oil filter
G500
G55AMG
8.5 US qt (8.0 l)
8.0 US qt (7.5 l)
Approved engine oils
Automatic transmission
9.0 US qt (8.5 l)
MB Automatic Transmission Oil
Transfer case
2.96 US qt (2.8 l)
MB part no. A 001 989 28 03 10
Differential lock mechanism
0.47 - 0.63 US qt
(0.45 - 0.6 l)
Brake fluid DOT 3+4, SAE J1703
Front axle
1.5 US qt (1.4 l)
Hypoid gear oil SAE 90, 85 W 90
Rear axle
1.9 US qt (1.8 l)
Hypoid gear oil SAE 90, 85 W 90
Power steering
approx. 1.06 US qt (1.0 l)
MB Power Steering Fluid, or
approved Dexron III ATF
Front wheel hubs
approx. 1.5 oz (43 g) each
High temperature roller bearing grease
Fuel tank
including a reserve of
25.4 US gal (96.0 l)
5.3 US gal (20.0 l)
Premium unleaded gasoline:
Posted Octane 91
(average of 96 RON / 86 MON)

334 Technical dataFuels, coolants, lubricants, etc.Engine oils
Engine oils are specifically tested for their
suitability in our engines. Therefore, use
only engine oils recommended by
Mercedes-Benz. Information on approved
engine oils is available in the Factory Ap-
proved Service Products pamphlet, or at
your authorized Mercedes-Benz Light
Truck Center.Please follow the FSS and Service Booklet
recommendations for scheduled oil chang-
es. Failure to do so could result in engine
damage not covered by the
Mercedes-Benz Limited Warranty.
Model
Capacity
Fuels, coolants, lubricants, etc.
Cooling system
approx. 12.7 US qt (12.0 l)
MB Anticorrosion/Antifreeze
Air conditioning system
R-134a refrigerant and
special PAG lubricant oil (never R-12)
Windshield/rear window washer system
and headlamp cleaning system
approx. 7.9 US qt (7.5 l)
MB Windshield Washer Concentrate
and water
1
1Use MB Windshield Washer Concentrate “S” and water for temperatures above freezing point or MB Windshield Washer Concentrate “S” and commercially available
premixed windshield washer solvent / antifreeze for temperatures below freezing point. Follow suggested mixing ratios (page 339).
!Always check the oil filler cap
(page 232) for important informa-
tion pertaining to the engine oil need-
ing to meet a specific Mercedes-Benz
specification (e.g. MB 229.5). If such
information is printed on the oil filler
cap, only use an engine oil from the list
of approved engine oils in the Factory
Approved Service Products pamphlet
that meets the specification indicated
on the oil filler cap.
Using engine oils of other specification
may cause the FSS to incorrectly deter-
mine the next service interval and will
result in engine damage not covered by
the Mercedes-Benz Limited Warranty.

335 Technical data
Fuels, coolants, lubricants, etc.
Engine oil additives
Do not blend oil additives with engine oil.
They may damage the engine.
Damage or malfunctions resulting from
blending oil additives are not covered by
the Mercedes-Benz Limited Warranty.Air conditioning refrigerant
R-134a (HFC) refrigerant and special PAG
lubricating oil is used in the air condition-
ing system.
Never use R-12 (CFC) or mineral-based lu-
bricating oil. Otherwise damage to the
system will occur.
Brake fluid
During vehicle operation, the boiling point
of the brake fluid is continuously reduced
through the absorption of moisture from
the atmosphere. Under extremely strenu-
ous operating conditions, this moisture
content can lead to the formation of bub-
bles in the system, thus reducing the sys-
tem’s efficiency.
Therefore, the brake fluid must be re-
placed every two years, preferably in the
spring.
Only brake fluid approved by
Mercedes-Benz is recommended. Your au-
thorized Mercedes-Benz Light Truck Cen-
ter will provide you with additional
information.
Premium unleaded gasoline
!To maintain the engine’s durability and
performance, premium unleaded gaso-
line must be used. If premium unleaded
is not available and low octane fuel is
used, follow these precautions:

Have the fuel tank only partially
filled with unleaded regular and fill
up with premium unleaded as soon
as possible.


Avoid full throttle driving and abrupt
acceleration.


Do not exceed an engine speed of
3000 rpm if the vehicle is loaded
with a light load such as two per-
sons and no luggage.


Do not exceed
2⁄3 of maximum ac-
celerator pedal position if the vehi-
cle is fully loaded or operating in
mountainous terrain.