My ac stopped cooling. Just blows hot air. Checked the freon, it was overcharged. We let some of the pressure off, but it still blows hot. I just bought it like a month ago and the car lot won't help. Does anyone know what this could be??

How do you know the system was overcharged? Do you own a freon recovery machine? Have you had it dye-leak tested?

No I have the guages to check the pressure and to put freon in it. There is dye in it now, but no leak..

How much freon was in the system originally? How much did you let out?

Please define "overcharged" and how did you let pressure off? You mean you partially purged the system?
What are your gauge readings with the engine off?
Does the clutch cycle but the system doesn't cool?
If the clutch cycles, what happens to the gauge readings then?