Ford 1998 Crown Victoria Owner's Manual page 121

Maintenance and care
CHECKING AND ADDING POWER STEERING FLUID
Check the power steering fluid.
Refer to the "Service Guide" for the
service interval schedules. If adding
fluid is necessary, use only
MERCON ATF.
1. Start the engine and let it run until it reaches normal operating
temperature (the engine coolant temperature gauge indicator will be
near the center of the normal area between H and C).
2. While the engine idles, turn the steering wheel left and right several
times.
3. Turn the engine off.
4. Check the fluid level in the
reservoir. It should be between the
MIN and MAX lines. Do not add
fluid if the level is in this range.
5. If the fluid is low, add fluid in small amounts, continuously checking
the level until it reaches the range between the MIN and MAX lines. Be
sure to put the cap back on the reservoir.
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