A/C problems

I have an '04 Silverado and it hasnt been run in about 1 month, but today i started it up and im having issues with the A/C. I turn it on and the driver side is fine and cools and heats appropriately, but the passenger side, no matter what is only putting out HOT air. Even on the Coldest setting it comes out HOT as if the heater was on? Any idea whats happening?

Anybody have an idea?

there is a reprogram for the hvac system for that....you ca try to disconnect your battery but i dout that will help...you can take it to a dealer and have them reprogram it..they will try to sell you an actuator...you could also call gm cust assist and tell them your having this problem...gm has given dealers the athority to warrenty anything up to 100k except for batteries and wear items...if you were in hou id reprogram it for you..it will prob cost you a hundred dollars or so to have it done or if you raise some hell....FREE...that how shit goes at gm now dayskent tx