Remember to pull your sun visors down. My AC doesn't stay charged so I have to rely on heat alone to defog windows. The visors trap the warm air.
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.
Uhhh the defrost button? Arr people that dumb?
If your windows gets foggy you need to turn up the heat as that lowers the relative humidity and direct the air towards the windshield, also check below the floor mats for water. If your car is a swimming pool your windows will be foggy forever.
Counter intuitively, you want to turn the a/c on as that pulls the moisture out of the car.
During winter when a vehicle is defrosting, it runs a combination of ac and heat to defrost windows and condition the air to limit moisture condensing on the interior.
American cars: "This obviously requires the AC."
That's when I just put the airflow on "feet". Most cars will actually blow like 30% up on the windshield when set to the feet direction. This lets me avoid running the a/c if I don't want to.
People in comments assume the heat or air conditioning even work.
Air conditioning also rapidly reduces humidity, so that tends to be the ideal option.
But if neither heat nor air conditioner work, well tough it out and roll the windows down...
If neither the heat or A/C work, you shouldn’t be driving that POS on the road.
Just because the ac/heat don't work it's automatically a POS that's not road worthy?
Depends on the part of the world and season. It wouldn't be roadworthy to drive in freezing temps without heat on the windshield
Do they not make cars with Defrost buttons anymore?
If you have a fancy new car without one just yell at your on board AI system until you start crying and then the tears are more blurring than the fog and you just don't care anymore.
They make cars with buttons? I thought ever car made after 2020 had an tablet taped to the dashboard ..
That’s REAR defrost. Front defrost is on the left, and yes, all cars still have that.
Humid and warm: use heat
Cold and dry: turn on a/c
I think you got the right idea, just backwards..
Assuming your heater, air conditioner, and blower motor all work correctly, you should use your heater defroster in cold weather, and your air conditioner defogger in warm weather.
Note the difference in environmental control terms...
Failing either heater or air conditioner, welp, just do what we do and roll the windows down.
Both of those settings turn on the A/C to remove moisture.
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