Wassup ya'll!?!?

I got in my car today and turned on the A/C and set it to 4 on the air vent speed. Once the car cooled down, I switched it down to 2 and noticed it wasn't working like it usually did. The A/C light stays on and all. Switching it all the way off, the A/C light goes off... So whenever it's on setting 1 and 2, the lights light up, but no air is "really" being blown in anymore. Settings 3 and 4 are ok. So in a nutshell settings 1 and 2 ain't working...

Do you guys know if this is some easy fix I can do myself or does this sound like something I'll have to fork over some money to a mechanic?

Thanks in advance....