What is the method for replacing the cabin air filter in a BMW 320i?
4 Answers
BMW 320i cabin air filter replacement method is as follows: 1. Open the glove compartment and remove the fuse box cover. 2. Remove the spring rope buckle, then forcefully pull upward to detach the plastic crossbeam above the glove compartment. 3. Squeeze both sides toward the center to completely remove the glove compartment, exposing the cabin air filter housing. 4. Unclip the buckles on both sides to open the housing cover, then remove the old filter and install the new one. Reassemble in reverse order. The functions of cabin air filters include: Minimizing entry of unfiltered air into the vehicle interior. Filtering solid impurities such as dust, pollen, and abrasive particles from the air. Adsorbing harmful substances and moisture from the air. Maintaining clean cabin air and preventing bacterial growth.
I just replaced the cabin air filter on my BMW 320i. The only tools needed are a T20 screwdriver and the new filter. First, open the glove compartment and pop out the rubber dampers on both sides from their clips to let the glove box hang down completely. There's an inner cover plate secured by four screws - remove them with the screwdriver, being careful not to yank the wiring connected behind the cover. Then you'll see the filter housing - press the clip to pull out the old filter, and install the new one with the arrow pointing toward the front of the car. When I did this myself, I noticed the filter housing clips are fragile, so I recommend gently pushing them back into place with your fingers. When reinstalling the screws, make sure they align properly with the holes. After finishing, test the AC at maximum fan speed to check for air leaks. The whole job takes about 20 minutes, but first-timers might need extra patience when removing the glove box.
As an experienced BMW technician, replacing the cabin air filter requires careful steps: First, disconnect the negative battery terminal for safety. Then, remove the damping rubbers on both sides of the glove box—avoid using excessive force. The filter housing cover has four Torx screws (T20 head); remember their positions when removing them. When pulling out the old filter, note the airflow arrow markings. Install the new filter with its activated carbon side facing the passenger compartment for optimal effectiveness. Pay special attention to avoid pinching any surrounding wires with the housing cover during reassembly. When reinstalling, first reattach the glove box damping rod before tightening the screws. I've encountered cases where owners installed the filter backward, which significantly reduces filtration efficiency and can cause unusual noises. Finally, clean the dust from the air vents and test the airflow—this noticeably improves air quality.
Changing the AC filter yourself is super easy, all you need is a screwdriver and a new filter. Open the glove compartment on the passenger side, press the two rubber clips on either side to release them, then remove the four screws to expose the filter. Pull it out and replace it with the new one, making sure the arrow points toward the front of the car. After each replacement, I turn up the AC for a while to eliminate any odors. Don’t buy the cheapest filters—they’re less effective and prone to tearing.
