Ford Windstar User Manual page 172

Driving
When to use (Overdrive) or press the O/D OFF switch
You will notice that there is only one
drive position ( [Overdrive]) on
O/D
your gearshift indicator (instead of
ON/OFF
Drive and Overdrive). However, you
will find a control labeled O/D
located on the gearshift lever. Push in the switch and the O/D OFF light
in the instrument cluster will illuminate. With the O/D OFF light
illuminated, the transaxle will operate in first, second and third gears and
will not shift into fourth gear ( [Overdrive]). Operating in Drive (O/D
OFF) provides more engine braking than (Overdrive) for descending
hills or city driving.
To return the transaxle to the normal (Overdrive) operation, press
the O/D OFF control again. Use this control to select between
(Overdrive) or Drive (O/D OFF) whenever you drive your vehicle.
If the O/D OFF indicator light is flashing on and off repeatedly when the
vehicle is started or does not come on when the O/D OFF control is
pressed, it means that there is a transaxle electronic system malfunction.
You should contact your dealer as soon as possible or damage to the
transaxle could occur.
2 (Second)
Use 2 (Second) to accelerate from a
stop on slippery roads, or to give
you more engine braking to slow
your vehicle on downgrades.
1 (First)
Use 1 (First) when added engine
braking is desired while descending
steep hills.
The automatic transaxle will shift to
the proper gear to ascend any grade without any need to shift to 1
(First).
Do not go faster than 61 km/h (38 mph) when in this gear. You can
upshift from 1 (First) to overdrive at any time.
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