Hello guys, I’m new here and right in advance “Hut ab”, what you do here! I could also find a lot of useful tips and saved me a lot of money and trouble. THANK YOU!!! But now to my request: Vehicle: S400CDI Mopf, Ez. 2004 The problem: since this winter I notice that no warm air comes from the middle nozzle and only when the middle wheel of the middle nozzle is set to “auto”. To increase blower level (no car mode in the KA) does not lead to success, the flaps of the Medium nozzle for the warm air is easy too! My remedy so far: the middle wheel from the “auto” position turn down very little, then a certain amount of cold air (fresh air) is mixed to it, but the middle nozzle heats a little. What I also hear: when I put the above-mentioned wheel on “auto” some flap (hearable between AI and medium nozzle) closes, although side nozzles open fully (e.g. in the morning when I drive away, is cold outside and a certain engine temperature reaches cht ist) Additional information: I think that I also have the problem with the “residual heat” when I press it, comes out in short relatively cold air, although engine still quite warm, but whether this is related to above-mentioned problem? I’m not sure. I’m grateful for every hint! Oh yes, just want to mention and protect myself preventively from being called “post-failing”: drive today on vacation and will stay away for a few days, i.e. can’t answer your comments immediately Or wish you happy holidays and a happy New Year! May the Mercedes gods be gracious, we bring the sacrifice enough. Greetings from Austria Sano