This is why I love the internet and sites like Reddit – because I learn all this random shit that once in a while comes in handy. If you were unaware, I live in Arizona – it’s really frickin hot here during May to September (aka right now) so this video find has impecable timing. If it’s 100-118° outside that probably mean the inside of your vehicle is around 140-160& when parked outside.
I’ve tried it a couple times already in the Arizona sun… seems to work enough to feel a difference but I seem to forget to bring my digital thermometer with me every day so I don’t have specifics. Can’t hurt to try right? Let me know if you’ve got it to work for you.
EDIT: Just noticed the video is down. Basically, open the drivers side window then shut the door. Walk around to the passenger side door and open and close it about 4-6 times. That cycles enough air in/out of the car to immediately lower the internal air temp. Shut the passenger door and get back in, roll up the drivers window and let the A/C do it’s thing with, in theory, less work.