Hello together, I have often asked myself the following questions about the air conditioning system, which in particular concern dehumidification in case of foggy windows:1. Dehumidification in winter It is well known that the air conditioning systems do not work below 4 degrees due to the protection function (wg. freezing?). As is well known, however, the windows fog the most especially in winter. Therefore, it does bring something to dehumidify the air conditioning system below 4 degrees or to counteract the foggy windows. 2. Switching the air conditioning over 4 degrees and driving into the cold How does it look if you turn on the air conditioning at over 4 degrees (e.g. in the underground garage) and let it run for some time (low garage is a rather bad example here) and then shortly afterwards the ambient temperature is below 0 degrees? – Do you have to worry about this or should you avoid such actions? Finally, it’s about whether you can switch on the air conditioning at any time without any damage or whether you can switch on the air conditioning system? should make a few thoughts about the ambient temperature? Actually, a warm engine would have to give enough waste heat, so that nothing can freeze there, on the other hand, the vehicles are specially designed so that cool air comes in.3. Dehumidification with defective air conditioning Especially with old cars it is more the rule instead of the exception that the air conditioning is no longer possible. Mostly it is leaking somewhere, so that the refrigerant does not remain inside. r Air conditioning without refrigerants still dehumidification? What about other defects of the climate? Are there, for example, defects in which the cooling no longer works, but also dehumidification?4. Switch on the climate in winter to “oil” the air conditioning system or similar. This question may coincide with the above questions. It always means that the air conditioning should be switched on regularly, so that the refrigerant gets everywhere, which at the same time would have a kind of oiling function or similar. e. But now it is the case that in severe winters (like the last one) it sometimes does not get warm over 0 or 4 degrees for weeks. Should one turn on the air conditioning nevertheless or does this bring something in terms of “oiling” or should one avoid switching it on? For your answers already thank you!