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Yes, I leave my car windows cracked open slightly (less than 1 inch) during warm/hot weather. My car windows have the Vent Shades and no one can see that the windows are open slightly.
It certainly helps the car to stay cooler in hot weather. And I'm not so certain that extreme heat doesn't damage some parts of the interior of a car. My pickup truck in Florida had the headliner come loose and droop down after about 7 or 8 years and I'm sure that heat had something to do with that. Lots of plastics, rubber, glue, and other stuff are adversely affected by heat over a period of time.
The materials they use in vehicle interiors today won’t get damaged in extreme heat or sunlight, these materials are tested in the harshest conditions in Arizona were GM has a proving grounds along wit others including suppliers who test their interior parts also.
Define "today." Toyotas made in the mid-2000s have a recall for melting dashboards. Not that an open window can prevent that problem, but just pointing out that even vehicles of "today" are not immune to such issues. https://jennstrathman.com/melting-dashboard/
And yes - I crack open the windows if weather and safety conditions allow. Dunno if it helps with lowering the car temp or not.
Hell, yeah. The hotter the car, the more potentially toxic chemicals will offgas from the interior. The cooler and better-ventilated the car, the cleaner the air inside of it.
No, because I do not like to deal with the pollen and/or dust inside the vehicle. I usually park in a garage, but no cracked windows when I do have to park on the street in NYC or DC. I leave the top down when I am in LA/OC/SD if I set out with the top down, but there's nothing to steal in the car and little risk of rain, but the windows are up.
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All the world's a stage, and all the men and women merely players: they have their exits and their entrances; and one man in his time plays many parts, his acts being seven ages.
~William Shakespeare (As You Like It Act II, Scene VII)
...When you leave your car parked? Why or why not?
Yes, because dear old dad always told us to roll down our windows slightly when we parked in some shadeless parking lot in Texas during the Summer. Then we had to roll the windows down when we got in until the AC blew some of the hot air out. I never actually saw any car with shattered glass because all of the windows were rolled up tight, but that was what was drummed into our heads.
I lived in Florida never had a problem and it gets very hot there. I’ve seen how suppliers test their components I’ve seen plastic interior parts subject to heat lamps baking them for a month or more and as far as the Toyota might of had problems but no other manufacturer had that problem. Do you see dealers cracking the windows in Las Vegas to let the heat out? If interiors were melting I’m sure they would vent their cars on their lots. Never seen shattered glass because of heat glass is made in a furnace and is tempered.
What car dealers do or don't do has little to do with the discussion. Most cars don't sit on a dealer's lot more than 30 to 40 days, so the dealer has little concern for long term damage due to heating of the car's interior. Also, these cars have to be hosed down almost daily to keep the dust and pollen to a minimum and this would present a big hassle to have to put the windows up and down so often on a car just sitting there.
Additionally, most cars on the lot don't have Vent Shades or other covers for the windoes, so if a sudden rainstorm came up, there's no way the dealer or his staff could shut all the windows on 400 cars in less than a minute or two.
So, I wouldn't put much credence into what car dealers do with their inventory as far as how I want to treat the car/truck that I may own for a decade or longer.
Never, to much dust and I've experienced insects and reptiles looking for a place to crash
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