this post was submitted on 02 Sep 2026
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[–] kalkulat@lemmy.world 3 points 8 hours ago

Just the other day I was listening to this song by the Grateful Dead:

"Sometimes the light's all shining on me ...

Sometimes I can barely see ...

And lately it appears to me

What a long strange trip it's been. "

[–] rumba@lemmy.zip 7 points 16 hours ago

Trick question:

Dew point is the exact temperature at which the current level of humidity forms. Heat is good because it makes the air at the surface stop condensing. AC is good because it dries the air out forming the condensate in your air box. Cracking the window is generally enough warmth to interrupt the process. Most new cars have a defrost mode that turns on both heat and ac to dry the air out.

So the answer is do anything, except just turning the ac colder.

[–] kestrel7_7@lemmy.world 16 points 1 day ago* (last edited 1 day ago) (1 children)

It’s not about temperature, it’s about condensation and humidity. Turn on the AC regardless of temp (e.g. even if it’s cooler out and you’re blasting the heat) and the defog too.

Source: I fucking live in Seattle and it fucking rains all the time

[–] QuinnyCoded@sh.itjust.works 1 points 10 hours ago* (last edited 10 hours ago)

but if I leave the AC on cold for too long I get mini fogs where the air blows

[–] tigermountain@lemmy.world 5 points 1 day ago

Open the window.

[–] AspieEgg@lemmy.blahaj.zone 28 points 1 day ago (12 children)

When I press the defrost button in my car, it turns both the heat and AC on at the same time. I assume this is to remove water from the air with the AC, then warm up the air increasing its capacity to hold water with the heat.

[–] LotrOrc@lemmy.world 1 points 10 hours ago

Yall have a defrost button?

[–] marretics@discuss.tchncs.de 28 points 1 day ago (3 children)

Your assumption is correct Also your car automatically calculates the condensation point and keeps the temperature and air moisture low enough not to cause any fogging on your windshield. Source: I've been programming AC unit controls for cars for the last 10 years

[–] MML@sh.itjust.works 2 points 17 hours ago (1 children)

They only do this with the automatic controls not basic knobs right? Apparently affected what filter I had to get.

[–] marretics@discuss.tchncs.de 4 points 15 hours ago (1 children)

Yes of course. The old school manual controls are usually mechanically connected directly to the flaps, so you cannot have any automated handling there

[–] MML@sh.itjust.works 2 points 14 hours ago

Thanks, just didn't know how far we strayed, my first car had separate keys, apparently the new one can detect air quality and automatically close, new is also relative.

[–] ayyy@sh.itjust.works 3 points 1 day ago (1 children)

How upset do you get when your buddy disables auto and proceeds to slam back and forth between full heat and full ac while claiming their shitty dial dj set is somehow waaaaay better than the computer?

[–] marretics@discuss.tchncs.de 3 points 15 hours ago

That's an instant un-friending offence

[–] weps@lemmy.world 2 points 1 day ago

thank you for your service

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[–] likebudda@reddthat.com 87 points 1 day ago (35 children)

The fog is moisture condensing on the cold windshield surface. Use heat directed at the windshield with AC on. The AC dries out the moisture and the heater warms up the surface preventing additional condensation.

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[–] Sam_Bass@lemmy.world 7 points 1 day ago

crack a window

[–] deaconblackhorse@lemmy.world 13 points 1 day ago (2 children)

Always use heat. Anytime you have a fogged up window heat will cause that moisture to evaporate. Cold will always make the window cooler which causes more condensation.

[–] chiliedogg@lemmy.world 8 points 1 day ago* (last edited 1 day ago)

Air conditioning will remove moisture from the air while cooling the cab, so the condensation can only form on the outside, where you have wind and windshield wipers to wipe off the condensation.

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