A broken or non functioning blower motor can cause a lack of flow of air out your vents, if your AC isn't blowing it could be because the blower motor is defective.

Please diagnose the problem before replacing as this isn't a particularly fun task.

Note the part from 4 seasons below is the only aftermarket manufacturer I was able to find, this is the same part O'Riliey's sells just for half the price so far as I can tell. I didn't have time to wait on amazon so I purchased from a local vendor.

The part can be found here:
https://amzn.to/3JeLFww
(Amazon affiliate link, I may earn a small commission on products purchased through this link at no cost to you)