Small boat engine servicing - How to drain coolant & how to change a thermostat

In this boat engine maintenance video we change the coolant & thermostat in a Volvo Penta D1-30B 00:00 fitting drain hoses 01:55 opening the drain taps/cocks 02:38 replacing the thermostat 03:44 flushing first with fresh water & then with radiator flush 05:00 adding coolant