Join Date: Aug 2018
Location: Two locations in NH: One near Concord, the other at the 45th.
If you use the a/c then turn it off, it will probably mist the windows. The condensation lays inside and when you restart the moisture rises out of the ducts. This is one of my perennial complaints about vehicles with a/c -- if you run the defroster, the compressor runs unless it's below freezing outside. Basically, a defroster paired to the compressor is addictive -- once you start using it, if you shut it off, the windows will fog up, so you've got to keep using the defroster. Its a chicken/egg situation, and the chicken keeps on laying eggs!
This is not peculiar to Jeeps or FCA products. It happens with and & every vehicle that has the a/c linked to the defroster.
I'm told the reason the two are linked is so the compressor is made to work during the months you wouldn't normally run it. However, where I live we can go weeks, even months, without getting above freezing; even when we do, I don't necessarily need to run the defroster. A garaged vehicle doesn't need the defroster unless I'm out in freezing rain or snow, but if its that cold the compressor probably won't run.
The issue for me is getting into the car on a rainy 40F day and my coat is wet. That fogs up the windows and I have to run the defroster, and then I'm stuck running it the rest of the day for the above-mentioned reasons. The next morning, even if the rain stopped, as soon as air comes through those ducts, it will be moist air from the day before fogs up the windows.