Why does ac blow hot air after recharge?

What is your question?

So, I decided to recharge my 2015 Nissan Altima's ac system because it was not blowing the usual cold air. After the recharge process, the vehicle was blowing really cold air that same day. However, the next day it was blowing hot air under the cold settings. I have also realized that the ac motor component is now beginning to make a weird and loud sound. I have looked for any leaks under the hood and I haven't seen any leaks. Also, it tends to blow colder air when settings are set to cold and low blow, no pun intended. Any suggestions to what component in the ac system may be faulty? How can I troubleshoot the ac system to know what part is malfunctioning? Thanks!