The couple next to us in the marina at Albufeira in Portugal are lovely. They bought their Dufour 36 Classic two years ago from a Frenchman and have been fettling it since, ready to do a transatlantic circuit.
Their Volvo Penta 2030 engine has only done 600 hours (the Frenchman didn’t do much!) and I’d shown them how to change the filters and oil etc.
However, from day one there has been an issue with the cooling system. The engine sets off its overheat alarm if it is motored hard and the raw water
