Use a suitable container. Used coolant must be
disposed of as specified in national and interna-
tional laws and regulations.
Always fit a new thermostat and a new cover to
the expansion tank after cleaning, as the oil in the
cooling system destroys the seals. If the engine is
equipped with a coolant filter, also renew this fil-
ter.
It may be necessary to wash it multiple times if
the cooling system is very dirty. One cause of
contamination can be that oil is lying on top of
the coolant and collecting high up in the cooling
system. If several rinses are needed, this is not
necessarily because work has been carried out
incorrectly. Oil residues often need to be rinsed
repeatedly from the expansion tank and the ex-
ternal heating system to be completely clean.
Repeated washing is more effective and prefera-
ble to using higher concentrations of detergent
(max. 10%) or cleaning for a longer period (max
30 minutes).
If only a small amount of dirt has collected in the
expansion tank after cleaning, one extra rinse
and clean of the expansion tank only is usually
sufficient. There is no need to clean the whole
cooling system again.
1. Run the engine until it has reached operating
temperature and then drain the cooling sys-
tem following the previous description.
2. Remove the thermostats.
3. Fill the cooling system with clean hot water
mixed with detergent 2 479 017. Detergent
2 479 017 must make up 5-10% (depending
on the degree of dirt) of the total coolant vol-
ume.
If detergent 2 479 017 is not available, use a
dishwasher detergent for household dish-
washers that does not foam. Concentration
1%.
4. Run the engine until it has reached operating
temperature for approximately 20-30 min-
utes. Remember to switch on the cab heating
system, if one is installed.
5. Drain the cooling system.
6. Fill the cooling system with clean, hot water
and run the engine for about 20-30 minutes.
7. Repeat steps 3-6 if the cooling system is not
clean.
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