Cadillac 2001 Catera Owner's Manual page 269

The access panel for the passenger compartment air
filter is below the grille, at the base of the windshield on
the passenger's side of the engine compartment. See
"Engine Compartment Overview" in the Index for more
information on location.
1. Open the hood of your vehicle.
2. Lift the engine compartment rear seal (see the arrow
in the illustration) and pull it back far enough to be
able to lift open the grille flap.
3. Unhook both retaining clips that secure the filter
in place.
4. Slide the filter toward the front of the car and then
pull the filter straight out.
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5. Replace the filter by sliding a new one in,
reattaching both retaining clips and closing
the grille flap.
6. Reinstall the engine compartment rear seal.
7. Close the engine hood.
For the type of filter to use, see "Normal Maintenance
Replacement Parts" in the Index.