MacBook Air 2017 keeps blowing air after failed macOS Monterey upgrade

Make sure you have a good backup.

Have you tried rebooting the laptop again? If so and you still have the problem, then you can try booting into Safe Mode to see if that makes any difference. Unfortunately completely running out of Free storage space usually ends up with a corrupted system or being locked out since it can be impossible to delete items from an APFS volume that has no Free space at all.

If Safe Mode doesn't help, then you will need to perform a clean install of macOS by booting into Internet Recovery Mode using Command + Option + R to access the online macOS installer. Launch Disk Utility to erase the whole physical drive (Intel Macs only) as GUID partition and APFS (top option). Within Disk Utility you will need to click "View" and select "Show All Devices" before the physical SSD appears on the left pane of Disk Utility. Quit Disk Utility and select the "Reinstall macOS".

dimiszygo wrote:

But now when I try to log in I get the apple sound and then the screen goes black. I rebooted, restarted, etc but problem persists. And the fan keeps blowing air.

this has gone from bad to worse haha.

It happens sometimes, but it usually means there is something more going on.

What should I do? Reopen in safe mode?

Yes.