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OT, sort of.auto AC

G

Greenfrog

Member
A lady I know wont run the AC in her car because she says it takes too much gas! I want to tell her, armed with the right info, that this is minimal in gas mileage and cost just to have comfort. Car Is I guess a 6 cylinder, average size four door sedan. Probably 200hp. ??<I want to tell her that this large of an engine can easily run an AC compressor with little effort. br>Educate me here please. I also want to tell her that driving across town or down the highway with the windows down, thus less aerodynamic, DOES take more gas! I feel the AC cools down all that vinyl in side the vehicle. Plus, what is sad he, she can afford it!,
 
Cars are now designed so it takes as much or more drag on the vehicle to drive it with windows down as it does to run the AC. Now of course that being said, I would suppose just across town and short trips like that at city speeds. It would all be a 6 one half dozen the other. There can be some health issues of getting in and out of a vehicle that has the AC on a lot like when shopping. I used to run from Deriot to Shootem up town (Chicago) Daily and would get a summer cold from being in and out of the truck several times in short times like to check in then go drop the trailer then hook up the other one then check it out and so on. SO I can see her reasoning for being with the windows down instead of the AC. I often drive with the pickup the same way because of a summer cold from it. Yes I suppose it could be argued it is not the AC. Though when I don't run it like that I don't get the cold.
 
In my experience, folks who won't run AC just like to drive around with the windows down, for whatever reason. The purported expense of running AC is just an excuse. My DIL insists she will get carsick if she doesn't have the window down. I'm sure it's all in her head, but she believes it so she drives around with her window down, summer or winter, whether or not her AC works. (It doesn't.)
 
You certainly mean well but you need to accept the fact that your lady friend has her mind made up and nothing you can say or do will change her beliefs. Don't be a Don Quixote.
 
Mobile air conditioning has come a long way since its introduction back in the late 50's. Up into the 80's-90's it was still a major drag on performance and mileage to an extent.

But unless she's driving a 30+ year old car, part of the design to increase fuel efficiency meant designing better compressors that turn much easier, combined with wind tunnel testing to maximize aerodynamics (wind resistance is the greatest force against a vehicle moving at highway speed), driving with the windows open negates the design features that help overcome wind drag.

But, I wish you luck, choose your battles carefully! Chances are your pleas will fall on deaf ears. She was probably told this by an authority figure way back at an early age. It is now so ingrained in her mind that no amount of logic will dislodge it.

If burning heat, and deafening wind roar do not convince her, nothing will!
Chances are it will only serve to drive a wedge between you and her on any and every future discussion!
 
I think it was on myth busters they proved driving with the windows open took more gas then running the air on . best of luck Bryan
 
(quoted from post at 20:24:33 07/05/22) Oops
Typing errors:
Inside the vehicle too.
sad here
Corrective text is my worst enema.
Click to expand...

As an aside, you can edit your posts now and correct those spelling errors--everywhere except the Tales forum. Why that one was excluded, I have no idea.
 
Right! My mom always said dont sit or sleep in a draft, you will catch a cold!
Maybe I should wear a mask!
My wife said she and her sister slept upstairs in a hot farm house in the summer with the windows closed.otherwise they would catch a cold! Must be folklore. Nowadaysabuse.
 
Yes, sometimes it does not leave spaces, use punctuation, or apostrophes

Just cant fix them.
Wont
Cant
..
.
 
Tell her the heat and sweating from not running the AC makes her stink, and that the AC will help prevent her from stinking.
 
And I once worked with a guy whos dad would not use high beams on his headlights. He claimed it was too hard on his alternator
 
My 4 door 4x4 6 cylinder pickup gets 4 mpg better on the highway with the air on. Around town it's a tad worse with the air on. Like maybe 3 tenths less. Not enough difference that I care at 100 in west Tennessee. Now years ago, with the '73 electra with a 455 yeah it was worse with the air, but gas was 48 cents.
 
I think that under 50 mph there is less drag from open windows than the load applied to the engine from using the AC.. Over 50 it is cheaper to use the AC because the drag from have open windows puts more load on the engine.
 
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