If you are getting frost inside the car, its my understanding that you have a leak somewhere, as mentioned already.

What I would most concerned about is the electronics of your vehicle. It may not be an issue, but if its on your windows, whos knows where else its condensing and as it thaws, who knows what kind of problems that will cause for you in the long run...

 

Run HVAC on outside air only in winter. Switch to defrost if necessary - this operates the AC.

 

did you roll the windows down at all the day it happened? Mine do this when i roll my driverside window down sometimes it doesnt go all the way back up and the next morning the windshield willl be all frosty.

 

Ice on the inside of the glass? What the hell? When it begins to melt, where do the water run?

 

This has happened to every car and truck I've owned and there have been dozens. It all depends on the outside temperature, the amount of H2O you bring in (snow on boots or clothes and people breathing) and how much H2O you can get out. Best thing to do is get as much snow off your clothing as you can and then make sure you get some air circulating as you drive open a rear window a crack if all else fails. It helps to pull the floor mats out once in a while wash them and dry them real well before putting them back in.

 

Nearly every morning this happens to my in my Eclipse if the nightly temp falls below 25F.
I got this special sponge to get the moisture off the windshield; it helps a little bit.

 

you have a leak somewhere and alot of moisture is getting in your car. I get moisture in my where the windshield gets dripping wet almost. AC does help defrost faster since it dries the air

 

I think it just depends on how moist of an area you live in and how much your humidity fluctuates.

I get ice on the inside of the windshield if the conditions are right in every car I own. I live in one of the wettest places in North America. 90-100% humidity most of the time. If you live somewhere that moist the moisture permeates the interior of the car along with what comes in on your shoes. When the temp drops at night generally the humidity outside will drop. The cold dry air will cause what moisture is in your car to become airborne as humidity levels seek an equilibrium just like temperature. The airborne moisture will condense on your window and freeze.

It's noticeably thicker ice on the inside in my van because extra moisture condenses on the roof and uninsulated walls.

A leak will contribute to the problem but I wouldn't say that ice on the inside of the windshield = a leak.

 

^+1^

 

Thanks for the replies guys. Its been a few days now. I always knock my feet together after I sit down to get the show off, but ill keep a tally.

 

Run your A/C while driving to remove some of the moisture and never leave your recirc button on for more than a few minutes (especially important to leave it off when the car is parked and sitting so the interior has some ventilation).