Vapore in Air vents on 2006 Subaru Impreza

when I started the A/C today I saw some vapor is getting out from the Air Vents inside the car, also it has the smell of the radiator coolant.
I don't know what is that?
it is the first time to see something like that.
also I want to say that the air humidity was very high today.

Asked by for the 2006 Subaru Impreza