I urgently have to change the cool water from waltraud, because I have been driving exclusively with water since juni – and now use Nachtfrøste, as I noticed at the end of the week. in the manual it says, I have to put something on “warm”, if I understand this correctly, the lueftung!? a screw on the right side – to be clearly recognized on the drawing, in which realitæt is not yet discovered – as well as the lower hose on the large luefter/kuehleinheit front must be geløst. there after it’s just time to fill up again. Does everything just come out like that? what is meant by the “warm” position!? and maybe I even have to have the motor on so that the water can run out??? 100% technique-laie… I am especially grateful for an answer before 13:00, otherwise I just try and read after what I might have done wrong… dear gruss oli