2003 MERCEDES-BENZ G55AMG engine overheat

251 Practical hints
What to do if …
Display
Possible cause
Suggested solution
Category
B
COOLANT
CHECK LEVEL!
The coolant level is too low.

Add coolant (
page 220).

If you have to add coolant fre-
quently, have the cooling sys-
tem checked by an authorized
Mercedes-Benz Light Truck
Center.
2
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 can 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 108).

252 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).
Display
Possible cause
Suggested solution
Category
B
COOLANT
STOP, ENGINE OFF!
The coolant is too hot.

Stop the vehicle and turn off
the engine.

Only start the engine again af-
ter the message disappears.
You could otherwise damage
the engine.
1
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.
Turn off the engine, get out of the vehicle
and do not stand near the vehicle until it
cools 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.

253 Practical hints
What to do if …
Display
Possible cause
Suggested solution
Category
B
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. Oth-
erwise the engine will overheat
due to an inoperative water
pump which may result 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 dis-
played. Doing so could result
in serious engine damage that
is not covered by the
Mercedes-Benz Limited War-
ranty.
1
COOLANT
VISIT WORKSHOP!
The cooling fan for the coolant is
malfunctioning.

Observe the coolant tempera-
ture display (
page 108).

Have the fan replaced as soon
as possible.
2