Volvo Penta D13 Operator's Manual page 79

Maintenance
Filling with coolant
WARNING!
Burn hazard. Steam and hot fluid may spray out. Stop
the engine and allow it to cool before opening the filler
cap.
IMPORTANT:
Only use coolant recommended by Volvo Penta.
Top up with the same type of coolant as already used
in the system.
Different types of coolant must not be mixed.
Topping up
Top up coolant to the correct level through the filler
opening on the expansion tank. Fill slowly, to allow air
that is displaced to flow out through the filler opening.
When filling an empty system, or if for some reason the
coolant level has sunk so low that it cannot be seen
through the filler opening, filling must be carried out
according to "Filling a completely empty cooling
system".
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