A/C blowing ice cold to warm hot air

Okay, I just got the car about 3 months ago and it has been fine, A/C was working great I mean cold cold then about 5 days ago about 8 hours from night to day I go start it up to leave turn A/C on and warm hot air blows that's it never gets cool. I've checked the fuses the relay the clutch and the refrigerant all fine I even unhooked battery for a few minutes then hooked it back up to like reset it and I will say now that was one thing when it stopped blowing cold air the temperature only dic panel said -36%f when I did that with battery it now says 73%f. Please help it's so hot.