Question about 1989 Oldsmobile Cutlass Ciera

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Excess condensation on inside of car windows

On cold or real cool evenings i find excess moisture on the inside of my car windows especially the windshield. Why? And what can I do to prevent this from happening.

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Have you been adding a little more antifreeze recently if so check the floor on the pass. side,if it is wet your heater core is leaking.That will also cause the excess moisture on the inside mostly on the winshield.

Posted on Dec 12, 2012

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I have a 2005 Impala. The windows fog up on the inside when it is cold outside or it is raining. They really fog up bad, to the point you can't see.


a fix for this is to run the ac
this although make it cold removes the moisture from the air inside the car and reduces the fogging up
if you have climate control run it or if not run the heater at the same time to take the edge of the cold
The air conditioner works by removing water vapor from the air through a condensation process there by making the air feel cooler
that restricts the moisture available to fog up the windows

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Why do the windows on my 2009 caravanfog uponce Istart todrive?The windows will beclear after I warm it up but once I start drive they fog up.I do not smell antifreezeand the heater core lookslikenew.


windows fog up on the inside simply because of the hot breath of the occupants
this heat is cooled by the screen and condenses and so a fog is created
simple physics really - hot moisture + cold air =rain to over come this quickly run the air conditioner ( climate control) and that takes the moisture out of the air in the car and then the windscreen clears
you are going to say that it is too cold for the ac to run well at the same time run the heater until you have a pleasant temperature that is dry ( climate control--when it gets too hot the ac cuts in and when it gets to cold the ac switches off BUT the moisture that causes the fog on the windows is gone )

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Window fogging


If it were a leaking heater core, the inside glass surface would have an oily film along with the fog.
It sounds like your fresh air intake is not working. You have to get fresh air from the outside to be able to get rid of the excess moisture inside the cabin. Or you have excessive moisture inside from a water leak that the system can't overcome.

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A/c condensation is draining to inside of vehicle


Look for a hose that got kicked or dislodged, sometimes it is easy to do...

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I have condensation build up on the inside of my windows when I use the heater. There is no antifreeze smell and I beleive the heater core is fine. What could be causing this problem. I have a 2002 Buick...


Might check the drain on the air conditioning/heater case under the dash, if it's not draining the moisture out that may be your problem, clear the drain passage.

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Why does my uplander frost from inside when the temperature outside is cold?


Hello and Welcome to FixYa.com



Condensation. just as your windows in your home hot inside cold out side. the a/c is supposed to come on when you turn on the defrosters to help remove the moisture inside the car if it does not have your a/c looked at



Thank you for using FixYa.com

Regards, Lee Davidian

Your FixYa Expert


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How do i fix heater core on a 2006 chrysler 300


If you're getting hot air, it's not the heater core.

Windows fog up because the humidity level inside the vehicle increases while the temperature of the windows decreases to a point where the dew point of the air is higher than the temperature of the glass. When this happens, moisture from the air condenses onto the glass. When you breath out, you increase the humidity of the air in the car because of the moisture in your breath.

The key for defrost to work isn't necessarily heat, it's more important to dry the air. There are two ways of doing this:

1.) Make sure you have the air recirculation turned off. This feature causes your car to recirculate air from inside the car through the air ducts. In the summer when it's hot and humid outside, this is what you want. However in the winter when the air is dry, you want to bringing fresh dry air from outside to replace the humid air inside the car.

2.) Turn on the A/C compressor. This will cool the air before it passes through the heater core. Cooling air removes moisture. This is why your car drips water from underneath in the summertime when you run the A/C. It is literally removing moisture from the air.

However, if your heater isn't working (blowing cold air even when on the warmest setting), then you may have a different problem.

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I have front glass fogging issue


Possible heater core leak. Is your coolant level going down, and perhaps an odour inside? Can you feel a sticky film of inside of windsheild?

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pull the rear interior cover from the door and check to see if the latch rod clips are broken or misadjusted. the moisture could be a result of a failed heater core, poor defroster operation (A/C not working, vent door, or blower motor), or the window seal could be defective.

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