The passenger side A/C blowing warm air?

The driver's side is okay, passenger is warm. If you drive it gets a minor improvement on both sides, am suspecting a weak compressor, checked freon level and its full, removed some and then tried again I can't add a lot, its full. fan works, these have non electric fans, I also see a bit of a wobble while the compressor is running, also it does not cycle on and off, it's on always so it's fine, and like I said only the driver side is cold, but it's not where it should be.