Where is the cabin air filter located in an Audi A4?
3 Answers
The Audi A4 has two cabin air filters: one is the intake air filter located at the lower left of the engine compartment cover panel, and the other is the blower motor filter. Below is a detailed guide on replacing the cabin air filters in an Audi A4: 1. Replacing the engine compartment cabin air filter: The intake air filter is situated at the lower left of the engine compartment cover panel. First, remove the leftmost foam piece, then lift the sealing strip to reveal the cover panel and access the filter. The filter is housed in a rectangular frame; release the frame's securing clips to remove it entirely. Install the new cabin air filter and clean the intake duct. 2. Replacing the blower motor cabin air filter: The blower motor filter is located above the passenger side footwell, concealed by a trim panel secured with plastic screws that can be unscrewed by hand. After removing the panel, you'll find an elongated cover; press the clip on the right side of the cover to detach it. Pull out the old filter and replace it with a new one.
When I first drove the Audi A4, I was also confused about where the cabin air filter was located. Later, I figured it out myself—it’s hidden behind the glove compartment on the passenger side. Open the glove box to its maximum angle, peek inside, and you’ll see a small panel or clips blocking it. Pry it open to reveal the filter slot. I replace mine every six months, checking it before summer and winter. Buying the filter myself costs just 30-40 yuan, and replacing it is simple: pull out the old filter and insert the new one, making sure not to install it backward (follow the arrow direction). This part is crucial—it prevents dust and pollen from affecting respiratory health. If not replaced, the AC can accumulate dust and develop a foul odor, ruining the driving experience. The location may vary by model year; for the B9 generation, it’s still behind the glove box, but it’s best to check the manual’s diagram to confirm and avoid damaging parts by forcing them open.
As a car enthusiast who loves tinkering, I often DIY the replacement of the Audi A4's cabin air filter, which is located behind the glove compartment. Specifically, open the glove box all the way down, locate the small cover panel secured by several clips or screws on the right side or bottom, and remove it to reveal the filter. The replacement steps are straightforward: pull out the old filter with some force and install the new filter paper, paying attention to the airflow direction usually marked to avoid installing it backward. It's recommended to replace it once a year, especially for owners who frequently drive long distances in areas with heavy smog—doing it yourself saves a lot of money, as the filter costs only 30-50 yuan online, saving hundreds in labor fees. Not replacing it can lead to reduced efficiency of the AC system, weak airflow, and potential mold growth, posing health risks. While cleaning, wipe off the surrounding dust to keep the area clean.
