A/C works only on passenger side

Hello,

This could be due to a faulty blend door actuator for the driver side.
The blend door actuator/motor is what controls the flow or hot/cold air. It can fail in a position when it is stuck in a certain position and not allowing you to change the temperature.
The blend door actuator is located behind the dash on the HVAC unit.

https://www.2carpros.com/articles/replace-blend-door-motor

I have attached diagrams below for your reference.

Let me know of any questions.

Thank you.