nothing comming from driver side vents, passenger side has no heat, it will not switch to window or floor

I have nothing comming from driver side vents, passenger side has no heat (dont know bout a/c its 35 degrees out) , it will not switch to window or floor. rear vent not putting out any either. this all started after it was in an accident hit in the left front. it has dual heat and air with control on passenger door. and digital head unit. what could be my problem