OPM 320 en-GB 40
© Scania CV AB 2019, Sweden
Cooling system
Cleaning the cooling system
Clean the cooling system more often than speci-
fied in the maintenance interval if necessary.
External cleaning: Cleaning the radiator
and charge air cooler
Do not use caustic soda or other alkaline deter-
gent as this could damage the aluminium.
Read the warning text on the detergent packag-
ing.
1. Check that the radiator and the charge air
cooler are not clogged on the air side and that
the cooling fins are not damaged.
2. Carefully scrape away any deposits from the
radiator cooling fins. Use a paraffin-based
engine cleaner if necessary.
3. Carefully straighten bent cooling fins using a
steel brush or the like.
Internal cleaning: Removing oil and
grease in the cooling system
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 thermostat.
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