I can never seem to get my windows to stop foggin up. When it rains, I have to turn the A/C on and when it is cold, I have to turn the heat on, but they fog up too quick for it to work. Is there something I'm doing wrong? I can't imagine what I would do if it were cold and raining xD

 

If it is like in my '85, you need to hit the A/C button when in the defrost setting along with the heat setting. That runs the A/C compressor to dehumidify the incoming air then the heater core heats it up and that hot dry air will do a better job of removing the moisture.

Some vehicles do that automatically, but Toyota makes it a manual function. And I know it works like this because after removing my factory A/C, the defrosters do not work as well anymore.

 

I live in one of the rainiest parts of Oregon and have never had my windows fog up to the point where it was a problem. In fact, they rarely fog up to begin with, but when they do I just open the moonroof and/or crack the side windows (vent shades) with the heater on 'defrost'. Closing the side vents will force more air onto the windshield also.

 

Mine doesn't have the vent windows unfortunately (I never understood why auto makers did away with those). I have tried closing the side vents and had better luck. When I left this morning, it was sunny and around 45 degrees. Usually I go out and start my truck 5 minutes or so before I leave. When I left, I got about 1/4 down the road and my windows were already fogged up. I've never thought about turning the A/C and the heat on in the defroster setting. My dad told me just a few minutes ago that shaving cream (foam, not gel) has some kind of ingredient in it that inhibits fog, I think it is the ammonia. So I'll have to try that.

 

Cleaning the inside of the windshield really well (squeaky clean) will help a lot. Also, the RainX folks make an anti-fog treatment:
- http://www.rainx.com/products/Windsh.../Anti-Fog.aspx

 

Don't ever use windex to clean your windows, it makes them fog up faster.

 

i have a problem with my defroster. its not that its weak or ineficiant, just doesnt work at all. light comes on but no worky.

 

I don't have vent windows either...vent shades cover the top and leading edge of the side windows so you can leave them cracked in the rain without getting wet. Never heard of the shaving cream trick.

 

Oh, I thought you meant vent windows. Yeah, I've been thinking about purchasing a set of vent shades for a while now. The shaving cream is new to me too. I watched a video, on eHow I think, of someone putting some on their bathroom windows. They never actually turned the shower on to show if it actually works, so it wasn't very helpful xD


Funny thing: I just washed all of my windows last thursday because the day before, I parked under a tree at work and birds attacked my truck with their fecal matter. Now that anti-fog stuff looks very interesting! Rain-X makes great products so there is little doubt that it wouldn't work. Thanks for the link!

I used the Glass Plus, which I think is the Dollar Tree equivalent

 

when you're using the A/C to remove moisture in the cabin, be sure the drain tube is draining correctly. otherwise, the collected condensation will stay in the cabin, evaporate, and eventually recollect on your windshield again. my commuter civic is doing this now, so in the a.m. i've got frost on the inside as well as outside! argh.

 

My beater is having an interior moisture problem too...is it bad if the passenger floorboard is a small lake?

Damn leaky windshield.

 

You must be on fresh air setting. A/C ON will help dehumidify but is not necessary.