Ford Mystique Owner's Manual page 196

If you do not let the engine relearn its idle, the idle quality of
your vehicle may be adversely affected until the idle is
relearned. Your vehicle will eventually relearn its idle while you
drive it, but it takes much longer than if you use the previous
procedure.
Passenger Compartment Air Filter
Replacement
In your climate control system, you may have a filter that cleans
the air before it enters the interior of the vehicle. This filter
should be replaced at the intervals in the Maintenance Schedule
and Record booklet.
To replace the passenger compartment air filter:
Remove both windshield wiper arms. With the wiper arm in
1.
the horizontal position, lift the arm away from the
windshield while pulling the retaining clip at the base
toward the windshield. Release the wiper arm, then lift it off
the base.
The screws on the grille
Remove the plastic caps from the screws on the grille.
2.
Remove the screws.
Open the hood. Pull off the rubber weatherstrip at the back
3.
of the engine compartment. Remove the screws that hold the
grille, separate the two halves and remove the grille.
Maintenance and Care
197