Ford Windstar Owner's Manual page 83

Instrument Panel Registers
There are four registers in the instrument panel. Each of these
registers contain a louver assembly which can be manually
adjusted to direct airflow UP, DOWN, LEFT and RIGHT. Each
register in the instrument panel also has a thumbwheel that
allows you to open or close each register. The defroster outlets
are located on the top of the instrument panel while the floor
outlet is located at the bottom of the center console. An
illustration of the register, defroster, and floor outlet locations
follows.
The climate control air outlet locations
82