With my 850 TDI, year 96, sporadically only hot air comes from all ventilation nozzles on the driver’s side. The air feels the max. heat. Rules can then on the driver’s side nothing more. On the passenger side everything is normal. Even when the climate is on, cold air arrives on the driver’s side, while then max. hot air flows towards me. After the restart of the car the phenomenon was gone again. The error occurred now 2 times. Nervt but extreme, since especially at the warm temperatures on a further drive is not to be thought of, it becomes so hot. I have to say that the climate since a few weeks after switching on makes a rhythmic noise, which after a minute then is gone. Sounds like the echo sound on a submarine, only the noise is longer What can bring the regulation on the driver’s side so through each other so much. Errors are not stored, I had already turned off. What comes to my mind so spora sich, would possibly be a actuator, the amok runs.