Guys, there is no air coming from my windscreen demister or air vents. The air control unit turns on and you can increase fan speed and temperature etc but nothing happens. Any idea were I looking to start looking to sort this? Could the car need the air con refilled/regased? From search it seems that when this is required the air con will work but then switch off in 5-10mins. Mine stays on but there is no air. Its a E350, 2010, C207.