Volvo Penta — Venting the cooling system
Maintenance · Freshwater cooling system
From a Volvo Penta service manual — check it applies to your exact model before use.
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Procedure
- In most systems the system self-vents to the expansion tank.
- In an external system not automatically vented, add a separate venting nipple (4).
- Fit an extra expansion tank with its minimum level mark between 50 mm and 1200 mm above the highest point.
- Connect a separate vent from the engine expansion tank to the extra tank below MIN level.
- Replace the engine pressure cap with a sealed cap and connect the engine venting hose below MIN level.
Specs & values
- Extra expansion tank volume: 15% of total cooling system capacity (5% expansion, 5% MAX-MIN, 5% reserve)
- Hoses must withstand temperatures up to 115°C (240°F)
Source: Volvo Penta service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.