stumbledotcom wrote:I believe the OP is describing a normal situation that occurs when a car from the relative warmth of a garage suddenly hits colder ambient air. I've noticed similar behavior with mine now that cooler temps have arrived (never gets truly cold here on the edge of the Pacific). There have been a handful of very cool days when I've left the garage and the windshield started to fog. Pressing the front windshield defogger button will clear it within seconds. Then I go back into Auto and the system doesn't allow it to happen again. I've never noticed the effect with my e90. Then again, I keep the e90 on the most aggressive climate control setting and the i3 on the least. I wonder if the i3 would react faster if I turned up the auto climate control intensity or if this is a side effect of the more eco design?
Correct - the warmer garage means the air in the car won't have condensed and fall to the floor or stuck on the windows. However as soon as it hits the outside frostiness it will all condense on the coldest surface - the windows. Couple of things I can suggest: :
1) is your recirculate drawing in fresh air? If it's frosty outside it will lower humidty than in the car, but the car might be recycling air on startup to warm it quicker. A quick blast of freser air will help clear.
2) Pre warming the car will heat up the windscreen too, and help stop condensation forming. You certainly need to put it in demist mode as soon as you get in the car.
3) When you get home leave the car outside to cool down before putting it to bed. And flush the cabin air before you stick it in the garage. if that's a pain - leave the windows open a bit in the garage. Thmoisture is probably from you breathing and perspiring on the way home or wet clothes. Allowing it to dry out in the garage will stop the condensation in the morning. Just don't try preconditioning with the windows open - lol.