Ford Windstar Owner's Manual page 299

Wipe off the dipstick cap, pull the dipstick out and wipe the
indicator end clean. Put the dipstick back into the filler tube and
make sure it is fully seated. Pull the dipstick out and read the
fluid level.
When checking fluid at normal operating temperature, the fluid
level should be within the crosshatched area on the dipstick.
The automatic transmission dipstick
NOTE: Your vehicle should not be driven until some fluid
has been added if the fluid level is below the bottom
hole on the dipstick and the outside temperature is
above 50˚F (10˚C). Add only enough fluid to bring the
level above the bottom hole. The fluid level should be
rechecked at normal operating temperature.
Adding Automatic Transaxle Fluid
The fluid type is stamped on the dipstick. Before adding any
fluid, be sure that the correct type will be used.
Add fluid in 1/2 pint (0.25 liter) increments through the filler
tube to bring the level to the correct area on the dipstick. If an
overfill occurs, excess fluid should be removed by a qualified
technician.
Maintenance and Care
299