Frost inside windshield?!

2024 tundra pro. First time in winter. And every morning I have frost inside the windshield. Just as much as the outside.

Anyone else experience this? Seal issue? No problems with my 4runner (2020) or Corolla (2001) which are also kept outside and daily driving.

 

dont have a 2024 but, wouldnt the frost on the inside be an indication of moisture somewhere inside.

After a quick innerwebs seach i found this brief explanation - may or may not help you..

"Some physics lessons may help you fix this. When the temperature drops below the dew point, moisture capacity in air is reduced and airborne water vapor will condense to form liquid water.
When it drops even more below freezing point, then the water will turn to ice.
This is natural and to reduce this, you need to reduce the humidity level inside the car. Look for any wet sources."

Hope its something simple...

 

Turn the AC on when you use the heater. Won’t solve it entirely but will help.

Hot/cold makes for condensation. Conditioning (drying) the air will reduce some.

Used to happen to my old Tahoe but that things was an old POS

 

Tracking snow into the vehicle?

 

there is some snow on the floormats , but that's similar to my other vehicles too.

Thanks for the quick response and scientific articles. Time to take out he gremlin bell to sort this out. I'll try that AC method, give those floor mats a clean wipe down. Good to know it's not a TSB issue or something.

 

I'd have to think something is wrong if you're getting ice inside, I've never had that happen unless I slept in my truck (don't ask) and my breath caused the condensation. I'm not sure snow on a floormat would do that, it'd have to turn into water vapor first but then again I know nothing on how that would happen. Maybe if you left the car running with the heat blasting on the floor setting but even then doesn't seem right. Maybe stop having relations in the backseat before going inside, all that heavy breathing, lol.

 

Must be humidity from the snow on the floormats. Are you set for fresh air or recirculate?

 

i can't recall if it's on fresh air or recirculate, but I'll check on that. What's the prefer setting?

Yah i find it very odd, none of my cars have this and the way I use the truck is no different than any other of my vehicles. The air is quite dry here in the pacific NW right now. Only happens on this truck, none of my other vehicles which is perplexing. A first for me.

I wish I was that lucky having heavy breathing in the back seat. Those days are over after having kids. lol

 

Recirc traps snowmelt plus all vapor from breathing (kids, dogs, or large humans doing whatever) in the vehicle.
Fresh-air pushes the moisture out.

Fresh air (almost) always.

 

Best setting is air from outside (recirc. off), AC on, even when heating. AC just dries the air.

 

Snow or ice sublimates directly to water vapor even when temperatures are below freezing; ever noticed your ice cubes shrinking (while still in the freezer/ice cube maker) when you don't use a lot them from the freezer? Sublimation in action. Same thing can happen with snow on the floor mats in the vehicle; turns directly to water vapor, raises the inside humidity level to a point that you get condensation on the inside, and the outside temperature is below freezing causing frost on the inside. You Tundra is evidently well sealed and creates an internal "bio-atmosphere" that is sufficiently isolated from circulating with the outside air.

 

You could try using a dehumidifier, there are some that don't need to be plugged in, they have beads that adsorb moisture and change color to indicate that they need to be recharged. I have a few hanging in the kids bathroom. I also have a plug in unit for the travel trailer that does a great job of pulling moisture out of the air.

$15 Eva-Dry Wireless Mini Dehumidifier, White (E-333)

https://www.amazon.ca/Eva-dry-333-R...e66568e36cf80554d3e83cb96da&gad_source=1&th=1

 

I always run fresh air, not recirculating...my dog's farts don't linger as long. Never have a condensation issue.

OP, if you aren't already, I'd suggest a good set of floor mats that keeps the carpeting dry. Wet carpet takes forever to dry, and also stinks.