The cabin air filter in most Kia Optima models sits behind the glove box on the passenger side. Accessing it typically involves opening the glove box, releasing its stops or damper, and lowering the box to reveal a rectangular filter housing. Replacement is straightforward and can be done by the owner with basic tools.
Location and access
In the typical Optima layout, the cabin air filter is tucked behind the glove box on the passenger side. This makes it accessible without removing major trim panels.
To access it, follow these steps:
- Open the glove box and clear out its contents.
- Gently release the glove box damper or squeeze the sides to allow the box to drop down.
- Look for a rectangular housing behind the glove box that holds the filter.
- Remove the filter cover by pressing the release tabs or sliding it away from the housing.
- Take out the old filter and check for dirt, moisture, or mold. Note the orientation of the old filter.
- Insert the new filter with the arrows pointing toward the inside of the car, reseat the cover, and close the glove box.
With the new filter in place and the glove box secured, run the climate control a few minutes to ensure proper airflow and that there are no leaks.
Model-year variations
For most Optima models from 2011 through 2020, the cabin air filter location is behind the glove box on the passenger side. The Kia K5, which replaced the Optima in many markets, uses a very similar access point and procedure.
Notes for specific years
Some trims may have a slightly different glove box damper or a small service panel, but the general approach remains the same: access via the passenger-side glove box and the rectangular filter housing behind it.
Filter types and replacement tips
When choosing a replacement, you’ll find standard pleated filters and activated-carbon variants. The right choice depends on odor concerns and local air quality; activated-carbon filters help reduce odors and some pollutants.
Important tips before you replace:
- Check the arrows on the new filter and align them with the housing arrows, pointing toward the inside of the car.
- Ensure the filter sits flat inside the housing without bending or crumpling.
- Dispose of the old filter properly and clean any debris from the housing before installing the new filter.
Once installed, reattach the cover firmly and test the HVAC system to confirm smooth airflow and that no unusual noises are present.
Summary
In most Kia Optima models, the cabin air filter is located behind the glove box on the passenger side. Access it by lowering the glove box, removing the filter housing cover, and replacing the filter with arrows facing into the cabin. The general approach applies to most 2011–2020 Optima models and the newer K5 in markets where it’s sold. Regular replacement (typically every 15,000–30,000 miles or per the owner's manual) helps maintain airflow and air quality.