It already started last week that the reaction of the air flow to the turning a adjusting button failed to behave, respectively, remained, i.e. ventilation turned up full pull and there was a lukewarm air. No matter whether the climate was on or off. Today then similar, or there was a delayed reaction to the turning on the wheel and from time to time such a unique clapping from the front, but also from the back. The “once-cracking” I repeated so every 10-30 seconds a few times over about 2-3 minutes. Then it stopped, I then closed my iCarsoft to the OBD and at the menu item climate/ventilation there was an error: “Component M2 / 16 /Actuator for left and right defrosting flap) is stiff or blocked.” Ok, now I know well what has cracked. But: does this stop by itself or is this the beginning of the end and I soon need a new ventilation box for my 270cdi? And when I was there, there was also a menu punk. t “ESM – Electronic Selector Mode”. I found an error message below: “Short circuit of the backlight component after Plus.” What can that be? Groetjes Carsten