Where is the cabin air filter located in the BMW 525li?
2 Answers
The cabin air filter in the BMW 525li is located in the engine compartment, next to the engine hood support rod. Extended relevant information is as follows: 1. The cabin air filter purifies the air entering the vehicle interior from the outside, improving air cleanliness. The filtering materials typically target impurities in the air, such as tiny particles, pollen, bacteria, industrial exhaust, and dust, preventing them from entering the air conditioning system and damaging it. It protects the health of vehicle occupants and prevents windshield fogging. 2. There are two types of cabin air filters: one without activated carbon and another with activated carbon (please clarify before purchasing). The activated carbon cabin air filter not only absorbs particulate matter, reduces respiratory discomfort, minimizes irritation for allergy sufferers, and protects the air conditioning cooling system, but also effectively absorbs odors. 3. The general replacement interval for the cabin air filter is every 10,000 kilometers.
A friend of mine drives a BMW 525Li, and I know exactly where the cabin air filter is located—it's in the footwell area on the passenger side. When sitting in the passenger seat, look down at the foot space, and you'll find a black plastic cover. You can remove it using a Phillips screwdriver or a pry tool. Once opened, you'll see the filter housing, which contains the rectangular cabin air filter, easily recognizable. When replacing it yourself, remember the arrow direction to avoid installing it backward. Generally, it should be replaced every two years or 20,000 kilometers to prevent weak airflow from the AC. After replacement, the air quality improves significantly. The location inside the car is cleaner than under the hood. The process isn't difficult—just lie down with a cushion, and it takes about 10 minutes. You can buy an OEM or compatible filter for around 100 yuan, but be careful not to cut your skin. I recommend practicing with online video tutorials.
