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Lots of Condensation On Inside Windows-New Car

1409 Views 33 Replies 10 Participants Last post by  noturbonoproblem

I originally posted this thread regarding my 2023 Forte taking a long time to warm up. The reason why it bothers me is because I always seem to have excess condensation on the inside of the windows. Sometimes it is fogged up, sometimes it is almost actual drops. When it is below freezing there is sometimes ice...all on the inside windows. I live in the northwest where it rains a lot but none of my other cars have ever has this problem. I have felt around the floor for wetness but cannot find anything. The windows have never been left down so that rain got in so I cant figure out why I am seeing this. I have tried defrost only, defrost with AC on, recirculate both on and off, regular vent with AC on and off...nothing seems to make a difference.

I have a short commute (like less than a mile 90% of the time) but have taken the car of several longer drives to really heat things up and hopefully dry out, but it seems to always come back after I am back to the short commute. For example, yesterday I took it to work at 6 am and it wasn't too bad. After work at about 6pm I had to wait for the front window to defog on the inside to drive home.

I did get a couple of digital hydrometers to put one in my truck and one in the Forte. The one in the truck is reading 53% and the one in the Forte is 69% which seems excessive. I would image both should be close to the same, so for some reason there is more moisture in the Forte. I am going to make an appointment today at the dealer to have it looked at but am curious if anyone else has this problem or suggestions on where to look. So far I have checked the in cabin air filter and ac drain. Not 100% sure on the ac drain, but I think it is working. Hard to tell as it has been wet here.
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Plugged evap sounds very plausible, but here's another thought, courtesy of an old VW Beetle driver.

In the Beetle's handbook it recommends slightly opening a window in winter for maximum heating and defrosting. Sounds counter-intuitive, but that car was so tight that heated air could not get into the cabin unless it had a way to get out. I've seen Beetle drivers in winter with fogged up windows (sometimes dripping like it was raining inside) who never read the handbook.

The Forte is likewise a tight car. Under the back glass on the package shelf are two vents to let out the incoming air. See if those are blocked.
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