Volvo Penta KAD/KAMD44P Operator's Manual page 52

Maintenance: Freshwater system
4
3
2
50
Coolant. Changing
The corrosion-proofing additives become less effec-
tive with time and the coolant must be changed. If the
freshwater system is filled with antifreeze mixture it
must be changed every other year. If the system is
filled with anti-corrosion agent mixture it must be
changed every year.
Coolant. Draining
Remove the filler cap on the expansion tank (this lets
the coolant run out faster). Put a container under the
1
drain cock on the hose without a blue marking (1).
Open the drain cock and drain coolant. Then continue
by draining the coolant from the other drain cocks (2–
4). Flush out the heat exchanger as follows before fill-
ing coolant.
NOTE! Deposit old coolant at a properly designated
disposal site.
Heat exchanger. Flushing out
Cooling performance is reduced by scaling in the heat
exchanger. It should therefore be flushed when the
coolant is changed.
1. Drain the coolant as above.
2. Insert a hose into the filler pipe on the expansion
tank. Flush with fresh water until the water which
runs out of the drain cocks is clean. Allow all the
water to run out.
3. Close the drain cocks. Fill with new coolant to cor-
rect level. Reinstall the filler cap.
IMPORTANT! If there is a danger of freezing
never top up with plain water, always add anti-
freeze mixture.