Draining seawatersystem on KAD44

[aerobat]

Hellp gents !

Please help a newbie . I,m on land and we might get a slight freezing one night . So not want to take any chances so i drain the engines . The blue plug on the hose for the aircooler , the aftercooler .

How do i drain the heat exchanger ? Does it also drain with the blue plug on the hose ?

Hoses on seawater side ( back ) are empty on the heatexchanger , also the screen on the impellerpump . Did i miss something ?

Thanks for quick help !

 

[Momac]

To help understand the frost risk please say in what country is the boat located?

 

[aerobat]

Germany . Forecast for the region on tuesday is close to zero - 3 deg plus . I may panic for nothing anf cannot believe it really freeze but just drained the genny , the watersystem and the engines .

Not sure with engines because the boat is brandnew to me ( a 2000 gobbi 375sc )