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It could be an airlock, it's very difficult to bleed the old Ducatos. The best way to do it is to get the engine up to normal working temperature and park with the bonnet facing uphill, then with the heater control fully open turn the bleed screw located at the side of the heater air intake a couple of turns anticlockwise and leave it for several minutes with the engine running until there are no more tiny air bubbles coming from the thread. Tighten firmly the bleed screw. Be very careful not to undo the bleed screw too far or you will get a faceful of boiling coolant.
This procedure may have to be carried out again after a subsequent journey.
Air is not only trapped in the heater itself but also in the highest part of the engine.
Phil.
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