We are on the road with our Sprinter 319 from 2014 with womo construction and have, like with our predecessor car, a 2006 crafter the same problem: After a operating time of 2-3 hours the blower noise changes and there is no air out of the openings. Blower runs audible and air cools (ventilation slots are ice cold) After a short turn off of the blower then it goes again for half an hour, after a longer break it goes then again for 2-3 hours. When we went 3 years ago with the crafter in the workshop, wanted to calculate 2 full working days (extension cockpit kpl ), but can not tell us if you would find the error. Without climate with dog in Croatia is not possible, therefore we ask for a tip. That must be a known problem? Thank you Dear greetings Jörg + Sandra