A/C doesn't blow from main stream (face, feet, face & feet etc.,), instead blows from defrosting stream near main glass.

If your Maxima is equipped with Automatic climate control, you must put your control unit into self-diagnostic mode, then follow the troubleshooting chart for whichever fault code is output by the climate control unit. (most likely a mode control motor fault)

If your Maxima is equipped with manual climate control, there are two main causes. The mode control (push button) switch unit and the mode control motor.
The switch must be tested first, then the wiring between the switch and the motor. If these things check good, then the motor should be replaced.