My ac is blowing cold on the right side, but hot on the left side. on 2004 Toyota 4Runner

A tech at the Toyota dealership told me that it might be low on refrigerant. I put a can of refrigerant in it, but it still wont blow cold on drivers side

Asked by for the 2004 Toyota 4Runner
1 answer
Its the blend door sticking or blend door motor. Can you hear it move when you turn the knob?