When the mechanical switch down to the dry air of the front windscreen works when put in another position with the dried remains of the front windscreen, does not work in other positions. every do position that switch works dry just the front glass.
could you tell where is the problem and what to do.
Affraid your question is very difficult to understand! but after many readings of it, I think you are trying to say that the selector for the air is stuck on the windscreen demist position?? if so the fault is either a wiring fault, heater control panel fault or the selector motor/drive failed
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