Foggy windows - Toyota Yaris Forums

JustPassinThru · 01-03-2014, 10:28 AM

If the air is moist, and it's much colder outside than in, the windows will fog up.

There's only two ways to deal with that: Blast hot air on the glass; or dry the air inside the car.

Hot air, is the defroster set on high heat. Takes cold air outside...as air is heated, its capacity for moisture increases; and if no water is added it becomes much drier. So even if it's 80 percent humidity outside at 0 F, once it's warmed up to 90F or so, it'll be very dry. Blasted on the glass, it will dry it off.

The other way, is to turn the heat down - and put the Air Conditioning ON. Yup...Air Conditioning dries the air. You're in your car on a snowy day...your shoes and pants are wet with snow; there's puddles in the footwells. That moisture circulates. Air Conditioning dries the air to where it will help remove the window steam without melting your face.

Third option, of course, is to just open a window. Not a big deal at 30F; killer when it's ten below.

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01-03-2014, 10:28 AM	#4
JustPassinThru Drives: No more Yaris Join Date: Dec 2013 Location: Montana Posts: 180	If the air is moist, and it's much colder outside than in, the windows will fog up. There's only two ways to deal with that: Blast hot air on the glass; or dry the air inside the car. Hot air, is the defroster set on high heat. Takes cold air outside...as air is heated, its capacity for moisture increases; and if no water is added it becomes much drier. So even if it's 80 percent humidity outside at 0 F, once it's warmed up to 90F or so, it'll be very dry. Blasted on the glass, it will dry it off. The other way, is to turn the heat down - and put the Air Conditioning ON. Yup...Air Conditioning dries the air. You're in your car on a snowy day...your shoes and pants are wet with snow; there's puddles in the footwells. That moisture circulates. Air Conditioning dries the air to where it will help remove the window steam without melting your face. Third option, of course, is to just open a window. Not a big deal at 30F; killer when it's ten below.