Pontiac 2004 Grand Prix Owner's Manual page 134

To change the passenger compartment air filter,
do the following:
1. Put the ignition in ACCESSORY and turn the
windshield wipers on.
2. Turn the ignition to off when the windshield wipers
are in the upright position.
3. Raise the hood.
4. Disconnect the windshield washer pump hose from
the fender rail and the air inlet grille.
5. Remove the hood weather-strip from the passenger's
side of the vehicle, peeling it back halfway to the
center.
6. Remove the air inlet grille retainers.
7. Remove the air inlet grille.
3-30
8. Remove the passenger compartment air filter by
pulling up on the tab.
9. Install a new passenger compartment air filter.
Make sure it slides under the compartment
retainers.
10. Reverse steps 1 through 7.