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Discussion Starter #1
The inside window of my car fogs up very easily. I have cleaned it to the point where it is crystal clear using both invisible glass and also rubbing alchohol but any time I drive with the windows shut it fogs up again, it does go away very quickly as soon as I either open a window or use the defrost but is still an annoyance.

The side windows aren't affected at all, just the front windshield

Does anyone have any suggestions? I really don't trust any of those anti-fog products since they all seem to have a history of causing glare.
 

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Discussion Starter #5
gazetowardthesky said:
but seriously, maybe you can just drive with the window cracked?
Yeah, like I said it's easy to clear, just an annoyance

Maybe I will try some fog-x, worst case scenario is I see halos at night and end up cleaning the whole thing with alchohol again to start over
 

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Why is using the front defroster an annoyance, that's exactly why it's in the car.
 

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dont use just the defroster, it causes lower mpg, read the manual! i discovered 3 days ago that using the MIX feature is actually a better combo for windshield fogging, and it doesnt lower your gas milage. Using the mix feature also runs the ac compressor which dries out the air that hits the windshield- thus making less moisture and less fog! Other then that I would try an anti-fogging product, I used to use stuff on paintball masks and I never noticed any haloing effects. Let me know if any anti fog things work, cause my side windows fog like hell in the winter, more so then most cars... I have horrible weather stripping.
 

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Japy said:
dont use just the defroster, it causes lower mpg, read the manual! i discovered 3 days ago that using the MIX feature is actually a better combo for windshield fogging, and it doesnt lower your gas milage. Using the mix feature also runs the ac compressor which dries out the air that hits the windshield- thus making less moisture and less fog! Other then that I would try an anti-fogging product, I used to use stuff on paintball masks and I never noticed any haloing effects. Let me know if any anti fog things work, cause my side windows fog like hell in the winter, more so then most cars... I have horrible weather stripping.
Just wondering... how does running defrost possibly lower your mpg, whilst running the a/c compressor does not??? :shocked:
 

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mine does that also, joe....I clean it and a few days later it is foggy again....i thought it might be something to do with the air coming out of my defroster having a somewhat greasy residue after it hits the window....I know in the past that when I had a heater core going out in my first car the windshield would fog up alot and it kept doing it so i took it in and found out my core was going bad and leaking a little bit and it was coming out the defroster/air conditioning ducts when I ran them...hope the same isn't happening again...lol...although I never smell antifreeze, but I AM always low for some reason, hmmmmmmmm....lol....
 

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I would try the Rain-X anti-fog, seeing that the Rain-X works great on the winshield the anti-fog can't be half bad. I think the fogging issue is when you have the windows closed the air being pulled up is a much different temp then that of the windshield and the result would be the fogging. I have had that issue before but when I change the temp of the defroster and speed up the fan it goes away. Just my 2 bits
 

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A look from another angle. Ok, I have seen cars come into the shop with this issue. The problem with them had been that the drain from the AC core under the dash was plugged. The water that collects has no where to go. When you run the AC,do you have water on the ground? If not. I would say this is the issue. The water has no place to go. It will also start a bad smell.
 

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Discussion Starter #16
No smell, yes water drain and it isnt the bad heater core fog. I have had that on cars in the past. This is just a typical no air circulation fog. the fact that it's a small car is another reason it happens so quickly.

I picked up some fog-x, gonna give the window a good cleaning and aply some of that to see if it helps.
 

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I use my car wax on the front glass and it does an amazing job of keeping it clean and not having that foggy haze they got on them.
 

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It's called HUMIDITY folks. A/C's are essentially DE-humidifiers. Check for water leaks, plugged drain (as already posted), heater core leaks, recent workout (i.e. sweat).
Condensation causes "fog". The A/c is designed to remove "fog", making the cabin "feel" cooler because it removes water vapor from the air (conditions).
78 degrees at 90% humidity is miserable, while 78 degrees at 20% humidity is considered cold by some.

See your "breath" on a cold dry day? - Condensation (water vapor in your breath)
See your breath on a hot humid day ? - Still condensation in your breath, but more closely matched to the surrounding ambient air, so not noticable "seeable".
Use whatever products on the inside of the glass you want, but have wet carpet, run through the rain to get in the car, heavy breathing inside on a cool night :love: , will still allow the glass to "fog", it just may take longer.
I know this for a fact. As an A/C service tech. ,I could make your house feel cold at 80 degrees. You may wake in the morning with a sore throat and bleeding nose, but you will feel cold because the air is so dry.
I can also make you feel "hot,miserable,stuffy" in a house that shows 68 degrees on the thermostat.
Feeling cool/hot is all about the humidity levels in your environment.
Check the Arizona folks on here, Hot?, yes, but with low humidity, so it does not feel as bad as say Florida in June right after a rain.
 
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