Hello guys! I have a problem with my 156s again. And I noticed some time ago that my ventilation is always faster, sometimes slower (about 1 second faster, then 1 second slower, etc). This happens on all levels, including the car setting. I thought that it might be due to the control and did not do anything further. Basically it goes yes and if you drive faster you don’t hear it anymore. But now I did a few days ago. I noticed that the light emitting diode on my mobile phone charger (for the cigarette lighter) is getting brighter and darker at the same frequency. As a result, I even noticed when driving it. Especially when you are driving down a slope, where the car would also keep its speed uncoupled, you will notice that the engine in just this frequency gives a bit more and a bit less gas. This happens both in gas and in petrol operation. However, not yet seen, the light is always constant in my opinion, even the instrument lighting gets nothing of it. The voltage fluctuations sometimes disappear completely, so that the blower rotates at constant speed. Does any of you have an idea what that can be? A contact error could be the solution, but where do the 3 systems (ventilation, cigarette lighter AND motor control) run together in electricity technology without, for example, the light being affected? Terie as a buffer could be taken into consideration, also the mass connections on the body. But then everything that needs electricity would have to be affected… Maybe someone knows what to do with it… Thanks already Ventorener