I have duel heat and ac for the car, the passenger side, when the heat is on is fine the driver side is cold . plus the face vent does not blow any air.

With dual zone climate control, each side is controlled by motors that meter the temperature selected from hot to cold air. If one side is not adjusting as desired, it can be a problem with the motor or controls for the motor. Hands on testing can confirm the source of the problem.