Where to Find the Cabin Air Filter on a 2018 Audi Q5

The cabin air filter on a 2018 Audi Q5 is located behind the glove box on the passenger side of the vehicle, accessed from the footwell area. Reaching it requires removing an under-dash panel and the filter access cover, but it is generally a straightforward DIY task with basic tools.

Understanding the Cabin Air Filter Location

The 2018 Audi Q5 uses a cabin air filter to clean the air entering the passenger compartment through the HVAC (heating, ventilation, and air conditioning) system. This filter traps dust, pollen, and other airborne particles. On this model, Audi placed the filter behind the glove box, mounted in the HVAC housing above the front passenger’s feet. Knowing the exact location and access steps helps owners replace the filter themselves and maintain healthy air quality inside the car.

Exact Location of the Cabin Air Filter

On a 2018 Audi Q5 (including most trims and engines sold in North America and Europe), the primary cabin air filter is located in the passenger-side footwell, behind a trim panel under the glove box. It slides horizontally into the HVAC unit.

General Placement

In practical terms, you will be working on the passenger side of the vehicle, kneeling or sitting near the floor. The filter is not behind a visible panel in the glove box compartment itself; instead, it is behind the lower dash/footwell trim beneath the glove box. Once that trim is removed, you will see a rectangular cover on the HVAC housing. The cabin filter is installed behind that cover.

How to Access the Cabin Air Filter

The steps to access the cabin air filter on a 2018 Audi Q5 are relatively consistent, though minor differences can exist depending on regional spec or optional equipment. The process mainly involves removing an under-dash cover and then sliding the old filter out of its slot.

Preparation and Safety

Before starting, it is good practice to ensure the vehicle is turned off and the HVAC system is set to “off.” While you do not typically need to disconnect the battery for this job, working with the ignition off avoids accidental blower fan operation while your hands are near the HVAC unit.

The following list outlines the basic tools and preparation steps to get ready to access the filter.

• Park the vehicle on a level surface and engage the parking brake.
• Turn off the engine and switch off all HVAC controls.
• Move the passenger seat back to create more working room in the footwell.
• Gather tools: usually a Torx driver (often T20), a trim tool or plastic pry tool, and a flashlight.
• Have the replacement cabin air filter ready (often a carbon-activated type is recommended).

With the workspace prepared and tools at hand, you can comfortably reach the passenger-side footwell and proceed to remove the panels that block access to the filter housing.

Step-by-Step Access Procedure

The list below describes the common procedure for reaching the cabin air filter on a 2018 Audi Q5. This sequence may vary slightly by market, but the overall layout is the same.

1. Locate the under-dash panel: Kneel or sit in the front passenger footwell and look up under the glove box. You will see a trim panel that covers the underside of the dash. It may have one or more screws and plastic clips holding it in place.
2. Remove fasteners: Use the Torx driver (commonly T20) to remove the screws securing the under-dash panel. Carefully note screw positions for reinstallation.
3. Disconnect any light or wiring (if equipped): Some Q5s have a footwell light or other small electrical connections on this panel. Gently disconnect the plug if present before fully removing the trim piece.
4. Remove the under-dash panel: Once screws and connectors are removed, pull the panel down and out. You may need to flex it slightly to clear edges, but avoid forcing it to prevent cracking.
5. Identify the filter access cover: With the panel removed, you will see the HVAC housing. Look for a long, narrow rectangular plastic cover with clips or tabs—usually running side-to-side—that marks the cabin filter compartment.
6. Release the filter cover: Depress or slide the retaining tabs or clips to remove the cover. The cover typically comes off by pulling it outward and slightly downward.
7. Slide out the old filter: Carefully pull the existing cabin air filter straight out. Note the airflow direction arrows printed on the filter so you can match this direction when installing the new one.

Once you have reached this point, the old filter will be removed and the filter slot fully exposed, allowing inspection and installation of the replacement filter in the correct orientation.

Replacing and Reinstalling the Cabin Air Filter

After gaining access to the filter housing, the next task is to install the new cabin air filter and reassemble the interior trim. Correct orientation, careful handling, and secure reinstallation of parts ensure the system seals properly and works as intended.

Installing the New Filter

The following steps describe how to insert the new filter correctly and prepare the vehicle for reassembly.

1. Compare old and new filters: Before inserting the replacement, compare its size, shape, and sealing edges with the old filter to confirm it is the correct part.
2. Check airflow arrow: Locate the arrow on the new filter indicating airflow direction. On most 2018 Audi Q5 models, airflow is from top to bottom or from outside toward the cabin; match the arrow direction to the markings or orientation you observed when removing the old filter.
3. Insert the new filter: Slide the filter into the slot gently, making sure it sits flat and fully inside the housing. Avoid bending or crumpling the filter media.
4. Reattach the filter cover: Replace the rectangular plastic cover over the filter opening, ensuring all tabs or clips snap securely into place to prevent air leaks or rattling.

By following these steps, you ensure the new cabin filter is correctly positioned, allowing the HVAC system to push air evenly through the filter media and maintain effective filtration.

Reassembling the Under-Dash Area

With the new cabin filter in place, the final step is to put the trim and any disconnected components back together so the footwell area looks and functions just as it did before the service.

The list below walks through the typical reassembly process after replacing the filter.

1. Reconnect wiring: If you unplugged a footwell light or any wiring harnesses from the under-dash panel, reconnect them securely, ensuring connectors click into place.
2. Refit the under-dash trim panel: Position the panel under the glove box, aligning it with the mounting holes and edges of the dash. Gently push it into place.
3. Reinstall screws and clips: Insert the Torx screws and tighten them snugly, but do not overtighten to avoid stripping threads or cracking the panel.
4. Visually inspect the area: Check for any misaligned trim, loose wiring, or gaps around the panel. Ensure everything is secure and looks uniform.
5. Test the HVAC system: Turn on the ignition and run the fan at different speeds. Listen for unusual noises and confirm that air flows normally through all vents.

Once reassembly is complete and the HVAC system functions smoothly, the cabin air filter replacement is effectively finished, restoring clean airflow to the interior.

Why Knowing the Location Matters

Understanding where the cabin air filter is located and how to reach it is valuable for both maintenance savings and passenger comfort. Dealerships and independent shops can charge notable labor fees for this simple job, even though it often takes 15–30 minutes with basic tools. By locating the filter in the passenger footwell behind the glove box and learning the access process, owners can perform regular replacements themselves, improving interior air quality, reducing odors, and maintaining effective defogging performance.

Summary

On a 2018 Audi Q5, the cabin air filter is located behind the glove box, accessed from the passenger-side footwell under the dash. To reach it, you remove the under-dash trim panel, open the rectangular filter access cover on the HVAC housing, slide out the old filter, and install the new one in the same orientation before reassembling the panel and testing the HVAC system. This straightforward procedure helps keep cabin air clean and the climate control system working efficiently.