Air conditioner blows cold through some of the vents

My fan for air conditioner/heater only works on the high setting. Does not have dual climate control. When I have the air conditioner on it blows very cold on the passenger side through the vents, on the drivers side vents its just kind of cool, but not really. I noticed yesterday when I turned the fan to the first setting which again, does not work, it was lightly blowing out very cold air in all the vents. I just had my air conditioner charged and apparently there is not a stuck door anywhere. I just have no idea whats going on with it but it is hot out there! Thanks in advance!