hi rider60,
i don't think there is anything wrong with your air conditioning system. on the contrary it is performing as it should. your first issue was with the windows
frosting on the outside. to understand that phenomena think of a chilled beer being poured in a glass. the glass frosts on the outside, right? why? because the chilled beer inside the glass makes its temperature drop and this causes condensation on the glass. same thing happened in your car. the insides were chilled and the warm, humid weather outside caused condensation on the glass surface due the temperature difference. condensation happens all the time when you run the air conditioner. every air conditioning unit has a water outlet pipe to dispose of all the condensation caused due to the contact between air and the chilled cooling coil. start your air conditioner and look below the car, you will see a steady flow of water droplets.
as for the mist blowing from the a/c vents, same reason holds true. ever been to a cold hill station, when you blow air from your mouth and if its really cold then it will give you the same effect. reason? warm, moist air from your body comes in contact with the cold and dry outside air and cools downs. this causes the water vapor content to convert into miniature droplets of water which we see as mist. same thing happened in your car. when you opened the door to get out of the car, the warm, moist air entered your cabin and that came in contact with the cold air from the a/c vents to give the mist effect. had you closed the doors and kept the a/c running, it would have disappeared in less than a minute.
i don't know if have helped you understand or confused you even more
, but be assured that your air conditioning system is not at fault,
its just mother nature with her bag of tricks..
cheers