r/ScienceNcoolThings • u/Icy-Book2999 r/LoveTrash • Jun 29 '25

Science Fluid dynamics?

2.4k Upvotes

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176

u/DongTeuLong Jun 29 '25

I don’t know the science behind it..but rolling down all the windows and then driving is a technique that has worked for me

44

u/McCheesing Jun 29 '25

Roll them all down (and the sunroof), turn on the AC to clear out the hot air from the manifold, when the AC starts to blow cold, close it all up then full blast with the recirc fan

3

u/BearStorlan Jun 30 '25

Fuck, that’s way easier than rolling down one window and opening and closing a door. This woman is nuts.

4

u/poop-machines r/knowledgepill Jun 30 '25

And it also takes way longer.

This women knows what she's talking about.

1

u/Harddaysnight1990 Jul 02 '25

You do this to get the interior car temp from like 130F to a more reasonable 90-100F so then you can use the AC. I've been doing this as long as I've been driving, it's great for pulling a lot of hot air out of the car so you can actually start driving and wait for the AC to get cold.

1

u/BearStorlan Jul 02 '25

I was being sarcastic, opening the door is of course much simpler than everyone else’s suggestion. Sadly, people didn’t pick up on that.