2004 Nissan Altima Owner's Manual - Page 211

WARNING ● Operating the engine with the air cleaner removed can cause you or others to be burned. The air cleaner not only cleans the air, it stops the flame if the engine backfires. If it isn't there, and the engine backfires, you could be burned. Do not drive with the air cleaner removed, and be careful when working on the engine with the air cleaner removed. ● Never pour fuel into the throttle body or attempt to start the engine with the air cleaner removed. Doing so could result in serious injury. LDI0154 LDI0155 IN-CABIN MICROFILTER (if so equipped) The in-cabin microfilter restricts the entry of airborne dust and pollen particles and reduces some objectionable outside odors. The filter is located behind the glove box. Refer to the "NISSAN Service and Maintenance Guide" for change intervals. To replace the filter, perform the following procedure: 1. Remove the 2 lower glove box hinge pins. Remove the glove box from the opening and let it hang by the cord. 2. Remove the filter cover from the intake unit by disengaging the 2 hook tabs at the bottom of the cover. Maintenance and do-it-yourself 8-21