Audi A3 1999: Wet and Steamed Windshield from Inside - Causes & Solutions for Condensation

I warmly welcome! I am writing because I have a problem with the steaming and wet windshield from the inside in the Audi a3 year 99. The problem is strange because the windshield was replaced but before my purchase and from my inspection I did not find any problem with the seals on the windshield. Strangely, it has not been raining for a long time and today, after a fairly sunny day, the glass was misted up and condensed. For example, after a storm or rain, the car can stand all night and there is nothing. Recently, I went to the automatic machine in climatronics and the air conditioning is running all the time and I have not used it before, can it condense somewhere or something? or is it just pasting? but if it let in somewhere inside, it would be visible (it seems to me) on the roof lining or at the posts that it is damp or wet. There is no water under the pit, nor is it dry everywhere, because I checked.

Well, it's best to pour a lot of water over this glass and see it carefully, because if it's not pouring, they stuck it rather well, if you can throw it in the glass and when you pour water, see if they stuck it wrong there

Hello, thanks a lot for your interest in my topic, I have already checked the pit: whether the water is standing still, whether it sticks to the glass and the cabin filter is dry. I really have no ideas, how can I go and paste the glass that is glued in well? well, I have no ideas, unless the air conditioning is condensing somewhere, because I do not know that way anymore

Maybe you loaded the trunk with something so that there is no way for the air to go out.

From what I read, you don't necessarily have a problem with a leaky glass. You have normal moisture in the car, which is pulled by the interior at night through the vents at this time of the year, then the car stands in the sun with closed windows / sunroof, moisture evaporates, for example, from seats, carpets, etc., there is no way to get outside (warm, humid air rises up), so it is deposited on the windshield, there is no way to get out through the vents, which are usually located in the lower parts of the car body.

and that's what it is
remedy: you drive with the window tilted and the heating to the maximum and of course the air from the outside, not from the inside
in some time the moisture will come out to such a state that it will not evaporate so much
the method is ineffective if you drive a few km, i.e. for it to work, the interior must be warmed up for a long time

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Maybe you loaded the trunk with something so that there is no way for the air to go out.

Honestly, I gave a few trinkets, but on the corners, i.e. in the left wheel arch to the top of the subwoofer, it is small, you can call it a pencil case with fuses, a few keys, in the second also a few trinkets and a fire extinguisher and some kind of cloth near the wheel, but this is probably not the case.

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From what I read, you don't necessarily have a problem with a leaky glass. You have normal moisture in the car, which is pulled by the interior at night through the vents at this time of the year, then the car stands in the sun with closed windows / sunroof, moisture evaporates, for example, from seats, carpets, etc., there is no way to get outside (warm, humid air rises up), so it is deposited on the windshield, there is no way to get out through the vents, which are usually located in the lower parts of the car body.

I can tell you honestly that you deserve to be helped because your answer probably presented my problem, I think that probably is the reason. In general, I checked the carpets and they were dry, but I still have rags, so maybe they get wet, I have to buy rubber rugs now. Thank you for your help

Well, if it doesn't help, buy yourself some moisture, a good thing in the car, especially for this season and winter

Well, you see, I haven't found any leaks, and yet the problem is, unless there is water somewhere and I haven't found it yet, but I tested everything ... Unless it was somehow one-off. We will see the time, I will show now I will try to exclude this moisture, for example I will leave the windows ajar at night and always drive on the tilted door in the morning.

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Well, if it doesn't help, buy yourself some moisture

I have something like this at home, I will buy a cube and at night I will put it on the front seat and while driving I will put it in the trunk. Thank you for all your help.

There are ventilation grilles in the corners, under the rear bumper, and they must be clear because this is the only place where air can escape, especially in a well-polished car like the A3.

Also, do not use any antiperspirant, salt, etc. on the glass from the inside. If you accidentally use a "good" preparation, you will not get rid of constant fogging until spring.
Wipe the glass only with a cotton cloth (or real nanofibers) moistened with warm, boiled water and dry with another one. Multi-layered paper towels are also good, preferably odorless.

Or just a leaky heater? and only the windshield? it must have a leak, dry rugs because it does not drip, gets pressure during operation and evaporates the moisture settles

there would be a smell of liquid inside

kwok wrote:

there would be a smell of liquid inside

That's right, buddy, I don't feel the liquid and there are no losses in the expansion tank, I can also rule it out. Apparently there is moisture in the car and I need to get rid of this in some way, what my colleagues wrote above.