In case you wonder why, cooling air (with the A/C) dries it and makes it much less likely to cause fogging. I leave my A/C on year-round, summer or winter, and almost never have fogging.
Mine's never on Full Auto unless the dealer has turned the system off during a service. A/C on, fresh air (non-recirc), defrost with the fan turned down to "3" or so, and temp set to where you want it = the formula for cabin comfort and no fog. If it's wet and cold outside, however, 4 or more people in the vehicle make it very hard to keep the fogging totally in control.ByeByeChrysler said:I like keeping it on "full auto" all the time, if I turn on the very loud front defogger, it get too warm.