2003 MERCEDES-BENZ G55AMG coolant reservoir

220 OperationEngine compartmentAdding engine oil
Unscrew cap2 from the filler neck.

Add oil. Be careful not to overfill with
oil.
Be careful not to spill any oil when adding.
Avoid environmental damage caused by oil
coming into contact with the ground or wa-
ter.

Screw cap2 back on the filler neck.
Transmission fluid level
The transmission fluid level does not need
to be checked. The transmission has a per-
manent supply of automatic transmission
fluid.
If you notice transmission fluid loss or gear
shifting malfunctions, have an authorized
Mercedes-Benz Light Truck Center check
the automatic transmission.Coolant level
The engine coolant is a mixture of water
and anticorrosion/antifreeze.
When checking the coolant level

the vehicle must be parked on level
ground


the engine must be cool. The coolant
level should reach the COLD LEVEL
mark in the reservoir.
!Excessive oil must be siphoned or
drained off. It could cause damage to
the engine and catalytic converter not
covered by the Mercedes-Benz Limited
Warranty.
The oil dipstick1 tube allows for drain-
ing of oil by using a suction device.
Warning!
G
In order to avoid any possibly serious burns:

Use extreme caution when opening the
hood if there are any signs of steam or
coolant leaking from the cooling system,
or if the coolant temperature display in-
dicates that the coolant is overheated.


Do not remove pressure cap on coolant
reservoir if engine temperature is above
194°F (90°C). Allow engine to cool
down before removing cap. The coolant
reservoir contains hot fluid and is under
pressure.


Using a rag, slowly open the cap approx-
imately
1⁄2turn to relieve excess pres-
sure. If opened immediately, scalding
hot fluid and steam will be blown out un-
der pressure.


Do not spill antifreeze on hot engine
parts. Antifreeze contains ethylene gly-
col which may burn if it comes into con-
tact with hot engine parts.

221 Operation
Engine compartment
The coolant expansion tank is located on
the passenger side of the engine compart-
ment.
1Cap

Using a rag, turn the cap slowly approx-
imately one half turn to the left to re-
lease any excess pressure.

Continue turning the cap to the left and
remove it.

Check coolant level.
The coolant level is correct if the level

for cold coolant: is level with the
mark on the reservoir


for warm coolant: is approx. 0.6 in
(1.5 cm) higher

Add coolant as required.

Replace and tighten cap until you hear
it click a few times. If coolant has to be added, a 50 / 50 mix-
ture of water and
MB Anticorrosion /Antifreeze should be
added.
More information on coolant can be found
in the “Technical data” section
(
page 316).

267 Practical hints
What to do if …
G
VISIT WORKSHOP!
DISPLAY FAULTY
The instrument cluster display is
malfunctioning.
Some systems themselves may also
have failed.

Continue driving with added
caution.

Visit an authorized Mer-
cedes-Benz Light Truck Center
as soon as possible.
2
±
VISIT WORKSHOP!
DISPLAY FAULTY
Certain electronic systems are un-
able to relay information to the con-
trol 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.
2
W
WASHER FLUID
CHECK LEVEL!
The fluid level has dropped to about 1/3 of total reservoir capacity.

Add washer fluid
(page 321).
3
Display
Possible cause
Suggested solution
Category

321 Technical data
Fuels, coolants, lubricants etc.
Windshield/rear window washer sys-tem and headlamp cleaning system
The windshield washer reservoir is located
in the engine compartment on the front
passenger side. It holds approximately 5.3
US qt (5.0 l). The headlamp cleaning sys-
tem is also supplied from the windshield
washer reservoir. 
Refill the reservoir with MB Windshield
Washer Concentrate “S” to and water
(or concentrate and commercially
available premixed windshield washer
solvent / antifreeze, depending on am-
bient temperatures) (
page 321).Washer fluid mixing ratio
For temperatures above freezing use
MB Windshield Washer Concentrate “S”
and water:


1 part “S” to 100 parts water
[40 ml “S” to 1 gallon (4 liters) water]
For temperatures below freezing use
MB Windshield Washer Concentrate “S”
and commercially available premixed
windshield washer solvent / antifreeze:


1 part “S” to 100 parts solvent
[40 ml “S” to 1 gallon (4 liters) solvent]
Warning!
G
Washer solvent/antifreeze is highly flamma-
ble. Do not spill washer solvent/antifreeze
on hot engine parts, because it may burn.
You can be seriously burned.