Subaru 1998 Impreza Owner's Manual page 130

2. Remove the old filter.
Plastic tab
New filter
3. Insert a new filter with the plastic tab facing forward.
4. Install rubber seal on the duct opening.
CAUTION
Make certain that the rubber seal is evenly seated on the duct
opening.
5. Install the filter cover and secure with two (2) screws.
6. Fill out information on the small label supplied with the filter kit.
7. Attach small and large labels on the lower part of the center pillar.
4-12
Cooling unit
Rubber seal
Filter cover
HS0255
Center pillar
Caution label
Change label
HS0257
Screws
HS0256