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High humidity wet windows inside - Cars & Trucks

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  • Phil Cox Jan 12, 2013

    Thanks, but what is the likely cause and how do I fix?



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If you have air conditioning fitted, you can use this with the heater going as the air con not only cools, it also dries the air which helps with de-misting. It won't stop the heat coming through when you run it, so nothing to worry about there.

Posted on Jan 12, 2013


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My car gets super humid inside and water drips over the dashboard. why is that?

Check your carpets, I bet you have a leak. If the passenger floor is wet and smells like antifreeze you probably have a leak in your heater core. If it is wet other places and just smells like musty water I would look for a leak in that vicinity (windshield, back window, door seal)

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Why must I run the defroster so much?

this could be two items that i can think of
1st could be a stopped up cabin air filter , a low air flow would be felt out the vents on blower high setting

2nd sometimes a small hole develops in your heater core allowing a tiny bit of your cars coolant to flow into heat chamber , this gets evaporated by air flow thru heat box and recondenses back inside car , telltale signs are stuffy smell inside car and slight drip of coolant on ground under car as problem persists

heater core replacment is needed to fix this problem

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My volkswagen eos is getting wet on the inside when theweather is damp

take it back to dealers ,or sit in it and put it through teh car wash

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My 95 Seville Caddy inside windows are out of control--I cant find any cracks or anything to encourage the inside liquid on the windows but it even gets ice on the inside windows--I have to handwipe or...

Seems like you have high humidity levels inside the car, no necessarily from cracks, but rather from the heating unit of the defroster, which can leak vapor to the inside of the cabin. Humidity will stick to windows and freeze. Does the cabin smell stale?. I would recommend starting by having the defroster fixed, because there is a good chance that the humidity problem disappear as well.

Dec 09, 2009 | 1995 Cadillac DeVille

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When the heater is on, the humidity seems to be high. I turn on the defroster to clear the rear window. Is this from water leaking into the car (has happened in the past) or something worse?

There are 3 possibilities, all would be moisture in the car that shouldn't be. 1st. rain entering the vehicle 2. heater core leaking 3. plugged drain tube for a/c causing condensation to flow into vehicle. To fix, 1st check carpeting for evidence of water. The heater core and a/c drain tube would make it wet at the front passenger seating area (where your feet would be). If it was the heater core, you would detect the 'sweet' smell of antifreeze. If you aren't using the a/c, that isn't it. If it's rain water, find the wet area to determine about where the entry point is. It could be a door gasket, windshield gasket, leak at the cowl (between the hood and windshield-check for build up of debris inside, which can rot through, and leak. Good luck

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I am in the process of buying a jeep Laredo which seems to have condensation inside the headlamp glassis it possible to clean this/replace the glass/or is it best to buy a new pair

Condensation is deemed to happen if ambient temperature is lower than inside the headlamp and humidity inside of headlight is too high.
From a headlight design perspective, you cannot lower ambient temperature. Not much can be done with temp inside headlight either. However, humidity levels on the inside can be reduced. Most designs usually have 2 or 3 air vents to keep humidity below condensation threshold levels.
This might sound complicated, but the phenonomen is exactly the same as windows in a winter home and humdity levels inside. Too much showering, and bathroom window fogs up. Venting will reduce condensation.

You might wonder why headlamps are not designed to be 100% air tight, so that no humidity enters? Well, that would be in an ideal world with no heat losses in bulbs. As the headlights goes through continous warm-cold-warm-cold cycles as you turn light on and off, the air and plastic will expand and retract. This creates pressure changes, which will move a slight amount of air in and out. So instead of forcing the air to be inside, air is moved through controllable passages, so that minimum of road dirt will enter.

If condensation disappears within a week. Moisture can have been sucked up in high pressure wash. This should normally dissapate within a week by itself.

If condensation amount stays constant, then there is crack(s) in headlight that lets in water. This can be siliconed, depending where the crack is, or a replacement headlight should be considered.

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1 Answer

Windshield steam up after it sits awhile when colder wheather starts from when I bought new we are told they all do it by g m c I never beleaved them.

WOW this is not normal make sure inside window clean dirty window holds more moisture, also make sure you don't have water leak may have musty smell in car is carpet wet causing high humidity in car, does defroster clean window quickly if not does ac work? Also have them call tac (GM HELP LINE)

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1 Answer

When its cold outside why is my window freezing inside instead of outside of the car?

Too much humidity. The air inside your car doesn't get hot enought evaporate the water from wet clothes, boots ,etc. Try keeping a window cracked to let some of the moisture escape and turn the heater up until things dry out. That should do the trick.

Aug 15, 2009 | 2006 Pontiac G6

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