I purchased a new A/C vent for the drivers side left of dash. Does anyone know how to remove old unit from dash and reinstall new one.

If memory serves me correctly, I believe you will find screws on the upper right and left hand corners of the vent.

There is a phillips head inside upper right corner and a plastic tab inside grill upper left but the bottom is held by a screw. It seems like the lower section of dash may have to come off below the vent.