Windshield fogging up

ADUBIS · Nov 16, 2016

I only ask this question because my 05 1500 Ram didnt do this. When I get in my truck in the AM, (this time of year between 30 and 40 degrees outside) I usually have to run the defroster. When I get in the truck, the windshield fogs up pretty quickly. Ive tried every setting on the hvac controls and the only thing that seems to work is turning on the ac, or starting the truck a few minutes before I leave the driveway and letting the interior warm up a bit. Any idea what Im doing wrong folks?

EagleChief · Nov 16, 2016

Pretty sure it's the temp difference between outside air and the air inside your truck. I'm guessing most people are dealing with this during the fall and spring when temps change. Just use your defrost on warm air until it clears up.

MANual_puller · Nov 16, 2016

Every vehicle with working a/c I've owned did/does this. On defrost the a/c runs to pull moisture from the air. Typically it's not enough to run out the drain tube but the little that does come out sits in there and is enough to fog over windows in the a.m. when the outside air is cooler than inside the truck :favorites13:

crazy_luck · Nov 16, 2016

Get some of those silicone desiccant packs and put a few under each seat and a couple on the dash - they will absorb the moisture in the truck and reduce the fogging.

shmedley · Nov 17, 2016

I always put a sock filled with kitty litter under the seats.
I just grab some from a friend with cats

huntergreen · Nov 17, 2016

shmedley said:
I always put a sock filled with kitty litter under the seats.
I just grab some from a friend with cats

does that work ?

MANual_puller · Nov 17, 2016

huntergreen said:
does that work ?

If you sift the chunks out :naughty:

shmedley · Nov 18, 2016

huntergreen said:
does that work ?

Yes. Learned it from a few truck drivers that swore by it.

MANual_puller said:
If you sift the chunks out

Crap I knew I was forgetting something!!! :**** Eater:

adurm · Nov 18, 2016

My 15 did it too. Cleared up best using fresh air instead of recirc. Seemed counter intuitive to me. It's the only vehicle I've ever owned that repeatedly fogged up on a single trip.

ADUBIS · Nov 18, 2016

I think I'm gonna find some fog x and call it a day

Bourgeois · Oct 17, 2022

Didn't work for me

PaleFlyer · Oct 17, 2022

All my vehicles have always done this. Best advice I have heard is to "crack" a window overnight (if you can), and let the inside and outside normalize as the temp plummets. Or run the AC/defroster for a couple min before you roll.

I generally only get exterior "fog", so I can use the wipers to cheat a bit, but the inside, defroster. Defrost mode "should" turn the AC condensor on, to help dehumidify the air.

Forestry_Ridge · Oct 17, 2022

crazy_luck said:
Get some of those silicone desiccant packs and put a few under each seat and a couple on the dash - they will absorb the moisture in the truck and reduce the fogging.

I second this. I also sometimes shove a bandana or two down under the windshield to help dry it up.

Windshield fogging up

ADUBIS

Senior Member

EagleChief

Senior Member

MANual_puller

Shade tree grease monkey

crazy_luck

Senior Member

shmedley

Senior Member

huntergreen

Senior Member

MANual_puller

Shade tree grease monkey

shmedley

Senior Member

adurm

Senior Member

ADUBIS

Senior Member

Bourgeois

Junior Member

PaleFlyer

Senior Member

Forestry_Ridge

Wildland firefighter/EMT

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