With my 8s the windows have been fogging very extreme for a few weeks. The windows can hardly be freed during the ride. I exclude heat exchangers, because this is only 3 years old and I have no cooling water loss. Water should not penetrate, that the footrooms are dry. The warm air from the heating is also extremely humid, almost like sauna. Therefore my assumption that the flow is dense and the water in the heating section collects. How is there at the single-use How can I check if it’s clogged? Not that I’m running all the soup in the car. Where’s the procedure coming out of the car? Greetings Holger