Tundra Windows fogging

It could be indicative of a leak or excessive moisture inside of the vehicle. It could also be aided by extremely dirty interior glass surfaces (such was the case with my '00 PreRunner).

As a precaution, I'd check my carpeted floor boards under and all around your floor mats to be sure that they are dry. There are also anti-fogging agents for the interior glass (like RainX), but I've not used them personally.

I'm sure others here will have better suggestions/ideas.....

Stew

I haven't heard of that before as a Tundra problem, and haven't had that problem in my Tundra. As Stew said, look for the source of the moisture that ends up frozen on your glass.

Ken

PCE wrote:

that means you had lots of moisture in vapor form before it got cold enough to freeze up.

1) i always keep my vents turned to "recycle" when i leave the vehicle. 2) try to blast the air in hot/ac-on/outside air with windows cracked open for a minute before parking overnight, then close the vents as in #1, this will help evacuate any moisture that may be in the cab.

My 03 4 Runner fogs up after car wash... never fails... make sure that your AC button is pressed (yes, even in winter) as that eliminates a lot of the moisture from the car.

Got snow? Got carpet foot mats? Here (Rochester NY), I've been in cars where people made absolutely ZERO effort to knock the snow off their shoes before getting in. The heat melts the snow, the water soaks into the mats, which can only hold so much, and the moisture seeps into the carpet below. It becomes free vapor when the heat's on or the car sits in the sun and the interior warms up. In the aforementioned cars, it's almost impossible to clear the windows without wiping/scraping, due to the high level of humidity in the car.

So....how's your carpet?

Worst case scenario: You have a leak in your heater core causing steam to get into your defrost airflow. This happened to a '73 Ranchero that I restored in the late '80's.