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#4541164 - 10/12/17 01:01 PM Open doors glass for while before turning on A/C
Omar_Eltahan Offline


Registered: 12/13/16
Posts: 40
Loc: Egypt
is it necessary to open doors glass before turning on A/C after parking car in sunlight in hot weather?
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#4541172 - 10/12/17 01:11 PM Re: Open doors glass for while before turning on A/C [Re: Omar_Eltahan]
Kestas Offline



Registered: 06/04/02
Posts: 11881
Loc: The Motor City
Not necessary, but it does help push the hot air out of the cabin more quickly and cool down faster. I do this when the car is parked in the sun.

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#4541173 - 10/12/17 01:11 PM Re: Open doors glass for while before turning on A/C [Re: Omar_Eltahan]
Reddy45 Offline


Registered: 08/15/08
Posts: 1834
Loc: USA
Yes.

Heat always moves from a hot area to a cold area. Opening the windows will help that to occur faster.
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#4541174 - 10/12/17 01:11 PM Re: Open doors glass for while before turning on A/C [Re: Omar_Eltahan]
Leo99 Offline


Registered: 03/30/14
Posts: 2262
Loc: NJ
How hot is hot? I don't open the windows. What do you mean by "necessary"? It's not necessary. Do you mean advantageous? Maybe a little. I still don't do it.
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#4541178 - 10/12/17 01:13 PM Re: Open doors glass for while before turning on A/C [Re: Omar_Eltahan]
Balrog006 Offline


Registered: 08/09/16
Posts: 322
Loc: West Michigan
Necessary? No, how or why would it be necessary?

Will it help, probably. The car interior is likely to be hotter than the ambient temp, so allowing the hotter air to escape means the a/c will have to work less to cool the air. Once the air starts to work and the temp outside and inside the car is equalized then close them mostly (to allow the atoll warm air to escape as cooler air is pumped in) or all the way, otherwise your just letting in warmer air while the a/c tries to cool things down.
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#4541186 - 10/12/17 01:19 PM Re: Open doors glass for while before turning on A/C [Re: Omar_Eltahan]
exranger06 Offline


Registered: 01/25/08
Posts: 3680
Loc: Guilford, CT
The way AC works is it simply takes the heat that's inside the car, and it pumps it outside the car. Think of it like pumping water from one place to another. You're simply moving the heat from one place to another. Coldness is the absence of heat, so as more heat gets pumped out of the car, the cooler the inside of the car gets. So if you can let a bunch of heat out by opening the windows, the AC doesn't have as much heat to pump out and the car will cool down quicker.
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#4541187 - 10/12/17 01:24 PM Re: Open doors glass for while before turning on A/C [Re: Omar_Eltahan]
Nick1994 Online   content


Registered: 02/19/13
Posts: 8701
Loc: Phoenix, AZ
It helps a lot in extreme heat
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#4541197 - 10/12/17 01:33 PM Re: Open doors glass for while before turning on A/C [Re: Omar_Eltahan]
bdcardinal Offline


Registered: 06/03/05
Posts: 10230
Loc: Santa Barbara, CA
I don't think it is necessary. However out of habit I usually start the car with the driver's door open and keep the windows cracked an inch or 2 at least until I get on the freeway. If anything I get to hear the Borlas better.
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#4541236 - 10/12/17 02:01 PM Re: Open doors glass for while before turning on A/C [Re: Omar_Eltahan]
Omar_Eltahan Offline


Registered: 12/13/16
Posts: 40
Loc: Egypt
Well, I'm totally agreed on your opinions, it's my mistake not explaining enough.

First I'm talking about 30-35+ c not f.

Secondly I meant from health prospective, as I've read some topics plus people rumors that not opening windows for a while before turning on a/c causes Heath issues as smell Emission of plastic components inside car interior and Emission of gasoline smell insiside car!! Will affect Health causing Anemia, lower White blood cells, lever and kidney issues. even Leukemia and abortion on long run.

If scientific evidences available it well be great addition.
_________________________
2012 Chery A5 1.6L

Engine:Castrol Magnatec 10w40
Transmission:Mobil 80w90
Brake:Castrol DOT4
Power Steering:Unknown
Radiator Coolant:Mobil HOAT 33% EG

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#4541242 - 10/12/17 02:05 PM Re: Open doors glass for while before turning on A/C [Re: Omar_Eltahan]
Nick1994 Online   content


Registered: 02/19/13
Posts: 8701
Loc: Phoenix, AZ
I donít think itíll matter much to your health to be in heat unless you have existing health issues.

35C isnít that hot either.
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2015 Hyundai Sonata 2.4L 66k M1 AFE 0w30 & OEM
2000 Toyota Camry 2.2L 227k M1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 144k Napa 10w30 & Fram Ultra

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#4541244 - 10/12/17 02:07 PM Re: Open doors glass for while before turning on A/C [Re: Omar_Eltahan]
JHZR2 Offline



Registered: 12/14/02
Posts: 40422
Loc: New Jersey
I just leave the doors open for a bit before even turning the vehicle on, then I run the AC for a bit with the door at least cracked open.

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#4541246 - 10/12/17 02:11 PM Re: Open doors glass for while before turning on A/C [Re: Omar_Eltahan]
Eddie Offline


Registered: 12/07/03
Posts: 9063
Loc: Florida, Cape Coral
I run the AC in NON recalculation mode with a window open for about one minute. I close window and set AC to REC and go. Ed
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#4541276 - 10/12/17 03:07 PM Re: Open doors glass for while before turning on A/C [Re: Omar_Eltahan]
SirTanon Offline


Registered: 06/23/14
Posts: 1726
Loc: Phoenix, Arizona - USA
I live in Phoenix, and during the summer, ambient temperatures regularly go over 115 degrees F (46 deg C), and in the sun with windows closed during these times, it's not uncommon for the interior temperatures in my car to get over 140 degrees F (60 deg C).

During these times, when I get in my car, the first thing I do is open the windows an inch or so, and turn the A/C on full blast in non-recirculate mode. This helps to vent the super-hot air out of the car reasonably fast, and brings it down to at least a 'survivable' level until the A/C can really cool it down.

Once I can feel the A/C putting out decently cold air, I close up the windows and switch it to recirc mode. I've noticed that this process cools it down much faster than just starting with the A/C on recirc and driving off with the windows up the whole time.
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#4541290 - 10/12/17 03:25 PM Re: Open doors glass for while before turning on A/C [Re: Omar_Eltahan]
FZ1 Offline


Registered: 02/07/08
Posts: 4609
Loc: Texas
You need to buy a Heat Shield windshield protector to keep your car cooler in the Sun and your Dashboard protected from the Sun's rays. You can order a perfect custom fit on line about $50. U.S. Hope this helps.

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#4541319 - 10/12/17 03:54 PM Re: Open doors glass for while before turning on A/C [Re: FZ1]
SirTanon Offline


Registered: 06/23/14
Posts: 1726
Loc: Phoenix, Arizona - USA
Originally Posted By: FZ1
You need to buy a Heat Shield windshield protector to keep your car cooler in the Sun and your Dashboard protected from the Sun's rays. You can order a perfect custom fit on line about $50. U.S. Hope this helps.


I've actually already got both - good ones, at that.. Nice fitted velour custom-fit dash cover, and a good, thick, windshield cover.. Doesn't really help all that much in the summer. My car is a dark red, and it soaks up the heat.
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2010 Ford Fusion SE - 2.5 liter/6F35 Trans - 241,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 45,500mi

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