Ford 1996 Crown Victoria Manual page 221

Preparing to Change the Tire
1. Make sure that your vehicle will not move
or roll. Put the gearshift in P (Park). Set the
parking brake and block the wheel that is
diagonally opposite the tire that you are
changing.
When one of the back wheels is off the ground,
the transmission alone will not prevent the
vehicle from moving or slipping off the jack,
even if the vehicle is in P (Park). To prevent the
vehicle from moving when you change a tire, be
sure the parking brake is set, then block the
wheel (both directions) that is diagonally
opposite (other side and end of the vehicle) to
the tire being changed.
If the vehicle slips off the jack, you or
someone else could be seriously injured.
Turn off the air suspension switch (if equipped)
prior to jacking.
On vehicles equipped with Air
Suspension, turn OFF the Air Suspension
switch prior to jacking, hoisting or towing
your vehicle.
The air suspension switch — located in the trunk
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