Interior windows frosting while driving?

Grimace · Jan 6, 2015

Hey guys, so I noticed this in a few vehicles now and im wondering. When im driving my truck and its really cold out (-20 to -30 degrees Celsius) I find my driver side interior windows really fog up and frost. Regardless of what I do with my interior heat, I find if I crack open the drivers side window it will help with the frosting. Why does it do this? Is there anything I can do to prevent this other than putting down my window? I know this may be a stupid question but Just curious

darkknight · Jan 6, 2015

Just notice this this morning on my truck. It was -6 outside today and truck was warmed up from remote start. As i hit the highway the whole truck started to mist on the inside of the windows, front side and rear windows. Defroster was on and the heat was on full blast. I ended up having to grab a little towel and wiping the windsheild a little to see what was in front of me. I opened all the windows a bit and it started to go away. Once it went away it was fine.

Casper · Jan 6, 2015

Here's a possibility: Check under your back seat and make sure your third brake light hasn't been dripping into the cabin.

StevoTee · Jan 6, 2015

I find that once you get the truck up to a comfortable temperature (can feel your nutz again), I will put it to Auto (temperature wise, 22degC) and keep it on windshield/floor setting.

If you run the heat too high, you will get frosting on the inside of the windows (people get hot and start to give off some humidity).

This works best when you have a cab full and long road trip.

crazy_luck · Jan 6, 2015

Any moisture (like snow on your shoes) will find its way to the windows and create a foggy frost in the extreme cold.

cpilkington1 · Jan 6, 2015

If you get moisture in the cab, turn your A/C button on. The A/C will first dry the air before going through the heater box. If you do this and put your vents on recirc it should help remove some moisture from the cab...and check for leaks.

ExpressRules · Jan 6, 2015

As others have already said the moisture from your body will cause that condition. If you put your defroster on it will remove excess moisture just as the a/c does in warm weather.

Pigeonman · Jan 6, 2015

Mine does the same thing when it gets really cold. Also make sure you clear all the snow off the hood. It gets sucked into the fresh air intake once you get going good I think and ads extra humidity to the inside of the cab.

Interior windows frosting while driving?

Grimace

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darkknight

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Casper

U.S. Navy (Ret.)

StevoTee

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crazy_luck

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cpilkington1

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ExpressRules

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Pigeonman

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