2003 Cadillac Seville Owner's Manual - Page 143

Passenger Compartment Passenger compartment air, both outside air and recirculated air, is routed through a passenger compartment filter. The filter removes certain contaminants from the air, including pollen and dust particles. routine scheduled maintenance. See Part A: Scheduled Mainfenance Sewices on page 6-4 for replacement intervals. See your dealer for assistance when changing the filter. Your vehicle will not be damaged if you choose not to replace the filter once the old one is removed.