Thanks to you the thermostat has changed. also since yesterday I tried to change it to 2 40 torx. One for the big creak and one for the small one. na somehow the rear of the two screws is arranged so that you can start with the big creak or nut nix so I just got a little one…. everything worked out wonderfully. also at most a beer glass water (0,2l) ran out. hope also that maybe the leak now is thanks again for the help greets that