[Shop-talk] extremely window fogging

[Eric Russell]

Most (modern) cars will automatically run the A/C to dry the air when 
maximum defrost is selected.

It used to be advised to run the A/C for a short while about once a 
month - supposed to help keep the seals lubricated or something. At any 
rate it will not harm anything to run the A/C when it is cold. If you 
don't want the cold air just turn the temp setting to warm - then you'll 
get warm, dry air.

Eric Russell
Mebane, NC