I took my 2010 XK Coupe out last night for a short spin and had the a/c set at 64 degrees cabin temperature. I like it cold. The car has been in my warm garage for a number of weeks and the temperature outside was in the 80s. After a few minutes I noticed the rear window, side windows, and front windshield were fogging up. At first I thought it was the inside, but after putting on my wipers and rear defroster it got clearer. What's going on? Is it the change of temperature from very cold inside and warm outside? I don't get this during the day. Regardless, I thought this was unusual as I have not gotten this on any other car I owned. I will mention that I initially had the a/c set on recirculate and not automatic. Thanks all.

 

its all about the seals and humidity level...mine does the same, as do my glasses.

 

Physics: condensation of saturated air on colder surfaces

 

Mine does the same thing; so it's nothing to worry about. When I first saw this the title of this thread, I thought the fogging was on the inside and the high humidity could be from a plugged up AC drain hose if the AC system did not immediately clear it up.