I need help with A/C blowing hot air.

[Lolamay]

2nd time happening in less than a year

 

[EdP]

2nd time happening in less than a year

Not much information to go on. The more you tell us, the better reply you will get.
What happened the last time? Did you have it fixed or did it just start working?

If could be a relay that controls the compressor, it can be the vent position, it can be the controls.

From the information you provided, the only reliable answer I can give is: Something broke.