sounds like the problem i had. some days i'd be getting hotter air than outside. got me pissed, adding freon did nothing. finally took it to a mechanic and they fixed it. they sed it was some sort of valve that was broken. i don't remember which one it was, and if it kept too much pressure or if there wasn't enough. spent a lot of money to fix it...but i'm happy with my a/c now, it works just peachy