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Home » Windows Cracks

Can Leaving All Windows Closed When Parking In A Sunny Area Cause The Windows To Crack?

Submitted by admin on September 16, 2009 – 2:52 am20 Comments

The theory is that the sun causes the air inside to overheat and expand, increasing the air pressure inside the car until it is forced to escape through the easiest route; i.e., the windows. Any responses on this would be nice.

20 Comments »

  • Penn says:

    no…you are assuming the car is air tight…the vents the windows..everything leaks air…otherwise the cars would float when in water…all those places where water can leak in air also can leak out….an explosion might break a window or a neighbors kid’s bb gun..or even parking in hell as sandra says. but not expanding pressure from sun light

  • John says:

    yes u should leave a crack in the windows so ur windshield wont crack from the heat.it has happened to me before.

  • purrdyki says:

    no. i leave my car windows closed all the time when its sunny and they never break. So don’t worry

  • Michelle says:

    Good theory but my car has spent the last two weeks sitting out in 110 degree heat with full sun and all my windows are intact.

  • Sara says:

    No.
    The car has vents that will allow any pressurized air to escape.
    The temperature is probably only going to hit 110 or 120 degrees, not enough to cause problems for the glass.

  • EXPO says:

    yes. to much pressure can build up

  • LARCO says:

    i don’t think the sun will heat the car enough for that to happen plus in cars with a/c the a/c leads from the inside out and vise versa

  • theuntou says:

    Yes, that is possible. Why ? All Americans have A/C and we all turn them on, so we do not mess up our hairdo or for safety and other reasons. So, the interior of the car or truck gets real nice and cold and them we lock up nice and cooled car in the soon to bake for 8 – 10 hours ?
    Maybe your one of those who bought a special edition car with a hair crack on the window that can only be seen from the satellite.
    Maybe, the car over heated or a fire started.
    Maybe, there was a passiing hail storm missed all other cars and landed a real big one on yours.
    By the way, do you have any enemy that want to play a joke on you?

  • J V says:

    Yeah that’s not gonna happen. Cars are not that air tight.

  • DTB says:

    I think it is a myth. In 20 plus years in the autoglass replacement business I have yet to see a glass break from this.

  • Beware the fury of a patient man says:

    Yes, if it is very hot.I live in East Texas and the temp has been in the 100s ,so I keep my windows cracked a little.

  • Mom says:

    No, car windows are designed to take the heat.
    No car is air tight enough for pressure to build up inside.

  • Norm says:

    That theory doesn’t make sense because:
    1. The air temperature never becomes high enough to trigger that process.
    2. The car would have to be completely sealed from the outside, to keep fresh air from coming in. And they never are.

  • Pedro ST says:

    YES…if your window already has a stress crack/imperfection in it. The heat from the sun will further extend the crack/imperfection.

  • chanswor says:

    I had the front window on a camper cap shatter due to heat.

  • bluffmik says:

    no

  • Anry says:

    i was just ask this too days ago too/i would like to know myself.
    well let,s just use science-they,re must be truth to thisin extreme hot wheather.so just crack your windows alittle.if pressure builds up in bottle it can only be releashed when we open the bottle.another thought it cold air that expandslike ice in fridge,or ice in bottle or glas that expands and breaks.

  • kim w says:

    not unless u park your car in hell

  • Sandra K says:

    The windows may need not necessarily crack but it would be advisable to leave a couple of windows open a fraction of an inch if you are parking in a sunny area.
    This will help in maintaining air circualtion in the car and it will not over heat.

  • Suraj says:

    Back in 1999 I had a Geo Prism. I worked at a plant in South Louisianna all day and the car sat in the parking lot with the windows up. The heat index was over 104 degrees and I had a small chip on my windsheild. I came out of the plant at 3PM and my windsheild had a huge crack from top to bottom and it was parked next to the guard shack and no one had been near it all day.

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