By your description, it sounds like your HVAC blend doors in the dash have malfunctioned. At times, you may have the cable that is hooked to the blend doors, disconnect. This can cause one side to be hot and the other cold when the air conditioner is running.
〉 Answered on Jul 10th, 2013 by Amanda J. Pierce, MBA "AJ", Certified Mechanic, Project Coordinator; Primavera Scheduler at VIGOR Alaska Industrial Shipyard & BizzM3ch Solutions