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If the cooling system is heavily contamina-
ted, flush it thoroughly before refilling.
Topping up the coolant
X
Add coolant.
X
Start the engine and run it at varying
speeds for approximately 1 minute.
X
Add coolant mixed to the prescribed ratio
until it reaches the lower edge of the filler
neck.
X
Switch off the engine and seal the cooling
system again.
Observe any further information in the Oper-
ating Instructions from the equipment/vehi-
cle manufacturer.
! Corrosion inhibitors/antifreeze agents
that comply with Sheet 325.3 and 326.3
must not be mixed with those of Sheet
325.0/2 or 326.0/2. This prevents dam-
age to the engine cooling system.
Cleaning the cooling system
G
WARNING
The cooling system is pressurised. Hot cool-
ant can escape under pressure when the cool-
ing system is opened and scald your skin and
eyes.
Only open the cooling system at coolant
R
temperatures below 90 †.
Unscrew the cap slowly and release any
R
excess pressure completely before open-
ing the cap fully.
Wear suitable protective gloves, protective
R
clothing and safety goggles when handling
coolant.
G
WARNING
Coolant contains glycol and is therefore toxic.
Do not swallow the coolant. See a doctor
immediately if you swallow coolant.
Make sure that coolant does not come into
contact with skin, eyes or clothing. In case of
contact with eyes, rinse immediately with
plenty of clean water. Clean affected areas of
skin and clothing with soap and water imme-
diately. Change any affected clothing imme-
diately.
H
Environmental note
Collect used coolant, cleaning solutions and
detergents and dispose of them in an envi-
ronmentally responsible manner in accord-
ance with applicable local regulations.
X
Remove foreign objects (dust, insects, etc.)
from the radiator core fins. You can do this
by blowing them out with compressed air
or by spraying water from the rear side of
the radiator, for example.
! Only apply moderate pressure when
cleaning, since the radiator fins could oth-
erwise be damaged.
X
Drain off coolant when the engine is cold
(
Y
page 76).
X
If a heater is connected to the cooling sys-
tem, open the regulating valves fully.
Flushing the cooling system
X
Fill the cooling system with fresh water.
X
Start the engine and allow it to run for about
5 minutes.
X
Switch off the engine and drain off the
water completely.
X
Repeat the flushing process at least twice.
X
Fill the cooling system with new corrosion
inhibitor/antifreeze agent. Observe the
antifreeze protection (
Degreasing the cooling system
X
If necessary, degrease the cooling system
with a suitable cleaning agent. Information
is available from any Mercedes-Benz or
MTU Service Centre (
Work schedules
Y
page 74).
Y
page 11).
Z
77
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