Coolant Filling; Coolant Drain - Volvo Penta D25A MS Operator's Manual

Maintenance: Freshwater system
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Coolant filling

Topping up
Fill the freshwater system with coolant to the correct
level through the filler opening in the expansion tank,
for correct level, refer to section "coolant level check".
Fill slowly so that evacuated air is able to pass the fil-
ler opening.
Filling when the system is empty
1. Open the air ventilation cocks and close the coo-
lant drain cocks.
2. Make sure that systems connected to the cooling
system also are ventilated, e.g. heater, water
heater.
3. Fill the freshwater system with coolant to the cor-
rect level through the filler opening in the expansi-
on tank. For correct level, refer to section "coolant
level check". Fill slowly letting air ibleed from the
ventilation cocks and the filler opening. When air-
free coolant flows out, close the ventilation cocks.
4. To bleed the system, crank the engine 10 se-
conds while holding the emergency stop lever in
stop position. Repeat several times at one minute
intervals.
5. Check the coolant level and top up if needed.
IMPORTANT! Make sure that the engine is
filled with lubrication oil before starting or
cranking the engine.
IMPORTANT! The engine must not be
started before the system has been bled and
topped up.
6. Start the engine and run it under light load until
the thermostat valve opening temperature is
reached.
7. Check air vents for leaks.
8. Stop the engine and allow it to cool. Check the
coolant level in the expansion tank and top up if
needed.

Coolant drain

1. Remove the filler cap on the expansion tank.
2. Open the air vent cocks and then drain the coo-
lant from the drain cocks.
IMPORTANT! Check that the coolant really
drains. Deposits may need to be removed inside
the drain plugs/taps.
3. Drain all other systems connected to the freshwa-
ter system, e.g. heater, water heater, etc.
4. Close all drainage points.