Cooling System, Cleaning
WARNING!
All coolant is hazardous and harmful to the environ-
ment. Do not consume. Coolant is flammable.
Cooling performance is reduced by deposits in the
radiator and cooling galleries. The cooling system
should be cleaned out when the coolant is changed.
IMPORTANT!
Cleaning must not be done if there is any risk of the
cooling system freezing, since the cleaning solution
does not have antifreeze properties.
IMPORTANT!
It is extremely important that the correct concentration
and volume of coolant is added to the system. Mix in a
separate clean vessel before filling the cooling system.
Make sure that the liquids mix.
1
Drain the cooling system. Refer to
Draining the
Cooling System page 278
.
2
Put a hose into the expansion tank filling hole and
flush with clean water, according to specifications
in
Technical Data page 44
, until the water drain-
ing out is completely clear.
3
Should there still be some contamination left after
flushing for a long time, cleaning may be done
with coolant. Otherwise, continue as in stage 8
below.
4
Fill the cooling system with 15-20% mixture of
concentrated coolant. Use only Volvo Penta rec-
ommended concentrated coolant mixed with
clean water.
5
Drain the coolant after 1–2 days of operation.
Remove the filler cap and the lower radiator hose
if necessary to increase emptying speed.
To prevent suspended material from settling back
in the system, emptying should be done rapidly,
within 10 minutes, without the engine having
been at a standstill for a long time.
6
Flush the system immediately and thoroughly
with clean hot water to prevent dirt from settling
on the inner surfaces. Flush until the water run-
ning out is completely clean. Make sure that any
heater controls are set to full heating during emp-
tying.
7
Should contamination still remain after a long
period of flushing, a clean-out may be done using
Volvo Penta radiator cleaner, followed by treat-
ment with Volvo Penta neutralizer. Carefully fol-
low the instructions on the package. Otherwise,
continue as in stage 8 below.
8
When the cooling system is completely free from
contamination, close the drain taps and plugs.
26-0 Cooling System, General
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