Ventilation/climate stinks after switching to ECON

Hello, Last summer I had my air conditioning replenished. Now for some time the ventilation stinks extremely when I turn on the air conditioning and then switch to ECON. If I run the air conditioning, it smells like nothing. If I run the ventilation after Klikma operation for 10 minutes at the highest level, the stench disappears slowly. Normally I switch the air conditioning 10 minutes before I switch the Autzo off to econ so that the residual moisture in the evaporator and W What do I pay for it at the VW dealer? I’m going to remember that these self-infection sets at Phaeton wouldn’t be good, because the interior sensor between the ash cups would not tolerate this. (I mean, I read this here in the forum.)