Ford 1998 Windstar Owner's Manual page 172

Inflated passenger-side air bag
RWARNING
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.
172