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Old 08-17-2012, 03:12 PM   #1
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Moisture inside windshield

A few days ago, I had to drive for 2 hours around 3 am in the morning. It was about 54 degrees and when I stopped for a bite and left my car for about an hour, I came back and about half of the windshield had mist/fog on it. So I went on my way and used the defogger. In a few seconds, fog/mist was gone except for the bottom middle section of the windshield. I cranked up the defogger but it didn't do anything. I stopped and looked at it and noticed that the mist was inside the windshield and there were even a few drops of water trickling/settling towards the bottom. I don't know what could've caused this. I did not have any windows open. No open liquid containers inside the car. No liquid spills. Any ideas? Leaky weather seals? I did take a picture of it which I will post when I get home.


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Old 08-17-2012, 03:22 PM   #2
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Had the car been through a rain or car wash recently?

If there were no other sources of moisture inside the vehicle, I would suspect that your A/C evaporator/heater core chamber isn't draining properly. However, I think if that were the case you would have experienced some "musty" odors from your vents prior to now.
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Old 08-17-2012, 03:52 PM   #3
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the only time i've seen that was my 09 f150 and it was water from the third brake light seal leaking. Couldn't see it on the headliner it ran on top of the liner and down the front winsheild. couldn't even tell the headliner was wet until you pushed on it and it gushed water. I've also seen ppl that have spilt water in their car and not gotten it completly dry it will do that but only in the extreme heat not in 54 degree weather. Check your floorboads for water especially the rears.
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Old 08-17-2012, 04:19 PM   #4
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If I have my defrost on too cold of a setting, it will cause the same condensation and ultimately cause that lower piece of glass to be so cold that it forces condensation on the outside (NC humidity).

Try it on 74.

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Old 08-17-2012, 04:34 PM   #5
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My wife's Fusion does this if she leaves the defog on when parking it after a rain storm or a car wash. Its from moisture in the blower airbox. The easiest way to prevent it is to turn off the climate control so the flap for the defog closes before parking it.
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Old 08-17-2012, 11:53 PM   #6
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No water spills ever. I live in San Diego so lower extreme cold weather does not exist here. JayDez's explanation makes sense because I did leave the defogger on when I parked it for an hour. I did notice too that my a/c does not get cold enough even in max a/c setting (my 2001 Hyundai Elantra is even colder even in the lowest fan setting). And when I have the vent set to just the top, I can still feel some air from the floor vents. In an 80+ degree weather, I had to have it in the #2 fan setting to at least get comfortably cool. I have to crank it up to 3 for my preference.
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Old 08-18-2012, 12:30 AM   #7
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Get some desipacks from a hardware store (the little packets that come in new shoes and such) they absorb moisture. My last car had a problem with moisture in the cabin, it sucked especially in the winter because the inside of my windshield would have ice on it. Keep them on the dash when your parked and should absorb all that wetness. Also turn your climate control off before turning the vehicle off helps.
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Old 08-18-2012, 01:44 AM   #8
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To help eliminate interior condensation in cold clims...
If you park outdoors and end up with too much moisture in Winter.
When you drive for any distance, and the inside of the car is warmed up, before leaving the car. HOLD THE DOOR OPEN.. let all the hot air escape. it will take the excess moisture with it.

What happens is the car is cold, you excrete moisture through breath etc.. the car warms up and all that moisture stay inside car because the air is warm and dry.
So then you exit, leaving all the moist warm air behind.
Car gets cold, moisture condenses.. repeat a few dozen times and you got permanet foggy windows every time.
Like i wrote, just hold the door(s) open for a few moments. let ALL the hot air out. And no more foggy windows.
This is not a miracle, so if your car is fog hell, just doing it once is NOT gonna fix the issue. You have to do it every time in cold weather.(the seats pick up a bit of moisture too, but it is mainly the air itself which is the problem.)
Lucky me i have indoor underground parking.
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Old 08-18-2012, 03:08 AM   #9
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My focus does this my ranger did this. If it has colder air coming out of the vent even if the vent isn't on, than the air outside air it will build up at bottom of window I run the defrost on heat to match the outside air it will go away. Sometimes you can just be driving along on a back conrty road with a clear window then you hit a warm patch of air and the window will completely fog over in seconds .
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Old 01-13-2013, 06:22 PM   #10
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water droplets inside vehicle

This seems to happen each time we have rain and cold weather at the same time. After being driven and parked, after approx. 4 hours of rain and a 20 degree temperature drop. All the windows are covered with water on the inside of the vehicle. Is this someone else has experienced with their 2012 focus.
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