2002 Intrepid A/C Blows cold on drivers side only

[flash57]

My A/C used to work great and now it is blowing cold on the drivers side only. The passenger side has much warmer air coming out. I notice when I am running at a slow speed, 25 mph and have the a/c speed set to the lowest position, I can hear a gurgling or swooshing sound. Once I pick up speed or turn the knob to faster blowing, the noise stops, but the air is still warm on the passenger side. Has anyone experienced this. I am baffled!