For some reason the knob that controls the setting for vent, floor, defroster etc is stuck and will only go on floor and defroster. If I try and move it to the left all the way it feels like it its binding up. Is it vent controlled by some kind of vacuum that changes the venting?

One strange thing I noticed is that my cup holder in the dash was jammed closed since I got the car but now it opens just fine!