Ford Mercury Villager 1997 Owner's Manual page 151

The location of air bags and warning labels
Several air bag system components get hot after inflation.
Do not touch them after inflation.
The air bag will inflate only once. The system is designed
to function on a one-time-only basis. If the air bag is
inflated, THE AIR BAG WILL NOT FUNCTION AGAIN
AND MUST BE REPLACED IMMEDIATELY. If the air
bag is not replaced, this will increase the risk of injury in
a subsequent collision.
Seating and Safety Restraints
WARNING
WARNING
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