Hyundai Sonata Windows Fogging

)) "The a/c compressor runs in both defroster modes on my '07 GLS. FYI" ((

Then for whatever reason, excessively humid air is being processed. If you're operating the system with fresh air entry, reset the controls to "recirculate" mode. If you're already doing that, then it's time for a trip to the dealer to find and correct an extraneous air or (shudder!) coolant leak into the heater core casing. Check the drain hose from the heater core casing underneath the car - if it's plugged, condensation won't drain and you'll also end up with fogged windows regardless how you manipulate the HVAC controls. FYI

Replies to this message:

bhmr59 (Jan 11, 2007 7:26 pm)

#9 of 13 Re: Windows Fogging [ray_h1] by bhmr59

Jan 11, 2007 (7:26 pm)

Replying to: ray_h1 (Jan 11, 2007 6:28 pm)

One other thought. I really need to climb in back and clean the inside of the rear window. "Normally" it's OK. But on a damp or rainy day it appears quite fogged unless/until I turn on the rear window defroster.

A good "windex" of all interior glass may do the trick--or not. Even though your car is new, it may have "stuff" (a film) on the glass.

#10 of 13 Fog & dew by dave868

Oct 18, 2008 (8:00 pm)

I really dont understand... I have 3 cars in my driveway... and when I go out every morning the heaviest fog is on my Sonata. About half the time the other 2 cars windows are perfectly clear... but the Sonata's are always wet and foggy.

How can this be?

Replies to this message:

craigbrooks (Oct 21, 2008 3:41 pm)
- dave868 (Oct 22, 2008 7:10 pm)

#11 of 13 Re: Fog & dew [dave868] by craigbrooks

Oct 21, 2008 (3:41 pm)

Replying to: dave868 (Oct 18, 2008 8:00 pm)

You don't have rain water leaking into the trunk/spare tire area do you? Moisture trapped somewhere in the car can case this.

It's a 6 cyl curse dave.....you should have bought the 4.

Replies to this message:

dave868 (Oct 22, 2008 7:10 pm)

#12 of 13 Re: Fog & dew [craigbrooks] by dave868

Oct 22, 2008 (7:10 pm)

Replying to: craigbrooks (Oct 21, 2008 3:41 pm)

I only have had the car for 2 weeks now... and it really hasnt rained. I have also noticed that the rear defogger is very weak.

I was planning to buy the 4cyl...... until I test drove it. It was just too underpowered.

#13 of 13 fog in my lateral windows by molina99

Aug 12, 2011 (9:16 pm)

I have a sonata 2009 always during damp weather (summer or winter) or in the morning both lateral windows get condensations and fog blocking my rear vision in my lateral mirrors. It tried air conditioning, using fresh air and also recycled air without any success. The only thing that works is if I pump the heater to the max but if the weather outside is 85 degrees you feel like you are in an oven.
What do you think the problem might be?

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