Hello dear community, I drive a used Opel Astra J Bj. 2015 with an air conditioner. When I had moved the car in winter and had practically only the heating on, sometimes also the air conditioning (when the windows were fogged), there were a few small unsightly muffiny smells in the interior. In the spring it became worse then, so that I changed the filter and cleaned the capacitor by lance in the passenger room with a foam disinfection (the disinfectant) El ran out under the car too, so it doesn’t seem to be clogged). First the whole thing improved, but it got worse again. After that I did the whole procedure again more precisely and used the Sonax can afterwards. Unfortunately, I noticed again that the problem (muffy smell) was not completely solved. When everything didn’t help, I drove to the Opel workshop, where I leafed over 100 euros for a complete cleaning (Aircowell). With a high pressure lance the evaporator was disinfected again and all ventilation channels were cleaned. Unfortunately this did not help and at my pressure, the procedure was carried out again, this time even the access to the evaporator was exposed so that the back was sprayed. After some time I can now say that also this did not help. More precisely described it smells during an switched on air conditioner rather less, but it comes after which the Klim a system either switched off and the ventilation starts to run or at the next start of the car with constantly switched on air conditioning. If you drive all the time without air conditioning, the smell is not perceptible, you could say that the smell always occurs after using the air conditioning. The ventilation entrance is free and the condensation water also flows out of the car. I would be very grateful if any of you had experience with the topic and possible solutions we ß. Greetings