MacBook Air 2020 Intel i3 8Gb

Hello gleb209,

Thanks for visiting Apple Support Communities! We understand that you're having trouble with the temperature of your new Mac, and alerts when browsing the web that the website is using too much memory. For the heat, take a look at this guide and steps it contains: Keep your Mac notebook within acceptable operating temperatures

For the website alert, is this happening in Safari? If so, check to see if you have extensions installed? If so, turn those off to see if that helps with the alert. Those steps can be found under "How to turn off or uninstall extensions" here: How to install Safari extensions on your Mac

The steps here may also help: Safari troubleshooting on Mac

Let us know how it goes.

Take care.

I would strongly suggest to visit the apple store and choose the new M1 chipped MacBook Air and click the "trade in" button and enter your serial and seeing what you would get as a trade in, the m1 chip is much fast and the new MacBook Air does not have a fan.

I have a 2020 Intel MacBook Air with a Core i5, I rarely hear my fan run except when installing an upgrade or update. Some web sites do trigger a warning in Safari but it's more about the page consuming a lot of memory. Depends on how and what you watch in terms of video. If you watch everything maxed out at 4K then yes you probably will hear the fan. Intel says max temp that is acceptable is 100c so what you are experiencing isn't abnormal. Might not be acceptable to you, but those temperatures would not be out of the question given the CPU is probably maxed out. The i3 is a duel core chip by the way not a quad core, so it tends to work harder overall and produce more heat.

It sounds like you may have a dead fan.