If you use auto mode, then decided to make changes to the setting manually, it will sometimes put the car into the recirc mode.
Just watch out for this one, as the cabin will mist up will almost instantly in this mode.
Over a period of use, the front windscreen of any car, a cloudy haze forms on the inside of the glass.
The cause of this is thought to be, because when hot is constantly passing through the plastic air ducts, the plastic slowly releases an oily film that builds up on the inside of the glass.
This layer of film then accelerates the missing process.
If you are sitting parked in your car in good weather and with the sun passing through the glass,
If you take your finger and then pull it across the glass, if it is instantly visible, then that is a sure sign that you have the film build up on the glass.
A couple of micro fibre clothes and a glass cleaning produce is the cure.
When the glass is clean it reduces the speed of the misting.