The air con is very problematic indeed. I have been breathing in carbon monoxide. I have a way to override this auto switch problem. But very time you start engine you have to do this step (very fustrating but no choice). Press 'Auto' to on Press 'mode' 3 times Press 'A/C' 2 times Press 'the car symbol below A/C' 1 time Press 'mode' 1 time. This will override the auto switch of outside air coming in. After doing this you can do any tempereature & fun adjusment and the outside air will not come in. But need to do everytime you start engine.