engine overheat MERCEDES-BENZ ML320 2003 W163 User Guide

230 Practical hintsWhat to do if …Problem
Possible cause
Suggested solution
/
The yellow coolant warning lamp
lights up when the engine is run-
ning.
The coolant is to hot.
The coolant level is too low.

Stop as soon as possible and allow
the engine and coolant to cool down.

Check the coolant level and add
coolant if necessary (
page 206).
If the warning lamp lights up frequently, there
is a leak in the cooling system.

Have the cooling system checked by
an authorized Mercedes-Benz Light
Truck Center.
The coolant temperature gauge is above
248 °F (120 °C).
The coolant level is too low.

Stop as soon as possible and allow
the engine and coolant to cool down.

Add coolant to prevent engine from
overheating (
page 206).
If the coolant level is correct, the electrical
radiator fan may be broken.

If the coolant temperature is below
the red zone, drive on to the nearest
authorized Mercedes-Benz Light
Truck Center.
Avoid high engine loads (e.g. driving
uphill) and stop-and-go driving.

231 Practical hints
What to do if …
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.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 coolant warning
lamps. Extended driving with the sym-
bol displayed may cause serious engine
damage not covered by the
Mercedes-Benz Limited Warranty.
Do not drive without sufficient amount
of coolant. The engine will overheat,
causing major engine damage.

259 Practical hints
Flat tire
Inflating the spare wheel with
collapsible tire
Take the electric air pump out of the
rear cargo compartment (
page 238).
1Union nut
2Electrical plug
3Air hose with pressure gauge
4Vent screw

Open flap on air pump.

Pull out electrical plug2 and air hose
with the pressure gauge3.

Close the vent screw4.

Remove the valve cap from the spare
wheel tire valve.

Screw the union nut1 with air hose3
on to the tire valve.

Insert electrical plug 2 into the electri-
cal outlet in the front passenger foot-
well or rear cargo compartment
(page 158).

Start the engine.

Switch on the air pump.

Operate air pump until the pressure
gauge displays 61 psi (4.2 bar)
This takes about eight minutes for the
collapsible tire. The air hose 3 and the
union nut 1 can become hot during in-
flation. Please exercise appropriate
caution.

Switch off the air pump.

Turn off the engine.

If the tire pressure is above 61 psi
(4.2 bar), release excess tire pressure
using the vent screw4.
Warning!
G
Observe instructions on air pump label.
!Do not operate the electric air pump
longer than eight minutes without in-
terruption. Otherwise it may overheat.
You may operate the air pump again af-
ter it has cooled off.