have a 2011 audi a8. have a coolant leak. have to fill up the tank in the morning cause it leaked out over night so its pretty bad. my co worker found where its leaking from cause he had the same issue on his 2005 audi a4. it seems its the engine coolant adapter union. has any one else had this issue with their audi? for my car its in the back of the engine on the passenger side. Can’t find Youtube vids about it.