The air filters for a 2003 Nissan Altima are the engine air filter in the engine bay on the passenger side and the cabin (HVAC) air filter behind the glove box on the passenger side.
In this model year, there are two separate filters that serve different systems: the engine air filter cleans intake air for the engine, while the cabin filter cleans air entering the vehicle’s interior through the heating and air conditioning system. Replacement intervals vary by manual and driving conditions, so consult the owner’s manual for recommended service timelines.
Engine air filter location
To access and replace the engine air filter, locate the rectangular air-filter housing in the engine bay on the passenger side near the front of the engine. The filter sits inside the lid of this box and is secured by clips or screws.
- Park, set the parking brake, and open the hood. Locate the engine air-filter housing on the passenger side near the front of the engine bay.
- Release the clips or remove the screws that hold the lid in place, then lift the lid to expose the filter.
- Remove the old filter, noting the correct orientation (there is usually an arrow indicating airflow).
- Inspect the inside of the housing and remove any debris or dirt before installing a new filter.
- Insert the new filter with the same orientation as the old one, ensuring it sits snugly in the housing.
- Replace the lid and secure the clips or screws. Close the hood and run the engine briefly to ensure there are no unusual sounds or leaks.
Regularly inspecting and replacing the engine air filter helps maintain performance and fuel efficiency. If you notice reduced power or increased fuel consumption, the engine filter may be clogged or overdue for replacement.
Cabin air filter location
To access and replace the cabin air filter, you’ll need to reach behind the glove box on the passenger side. On many 2002–2006 Altimas, the glove box either drops down after releasing side stops or you’ll remove a small panel behind it to access the filter cover.
These steps guide you through locating and replacing the cabin filter to improve interior air quality and HVAC performance.
- Open the glove box and remove any contents.
- Detach the glove box by gently squeezing the sides to release the stops, or remove the panel behind the glove box if required for your trim.
- Remove the cabin-filter access panel or cover to expose the filter.
- Take out the old cabin filter and inspect the housing for debris or leaves.
- Insert the new cabin filter with the airflow arrows pointing toward the HVAC unit, ensuring a snug fit.
- Reattach the access panel and/or glove box, then close the glove box securely.
Replacing the cabin filter helps maintain cabin air quality and HVAC efficiency. If you experience reduced airflow or unusual odors, the cabin filter may be overdue for replacement.
Summary
For a 2003 Nissan Altima, there are two air filters to consider: the engine air filter located in the engine-bay air-filter housing on the passenger side, and the cabin air filter located behind the glove box on the passenger side. Each requires removing a cover or panel, correctly orienting a new filter, and resecuring fasteners. Consult the owner’s manual for exact steps for your trim level and follow the recommended replacement intervals.