Cadillac 2003 Seville Owner's Manual page 270

The engine air cleaner/filter is located next to the
coolant surge tank on the driver's side of the vehicle.
See Engine Compartment Overview on page
5-
14
for more information on location.
Be sure the engine has cooled before following these
steps to inspect
or
replace the engine air cleanedfilter:
? . Loosen the air duct
clamp, which is located
at the mass airflow
sensor end of the
air duct.
2. Disconnect the air duct from the mass airflow
sensor.
5-2 1