BMW 335i Cabin Air Filter

What does the cabin air filter do?

The primary role of a cabin air filter is to enhance the air quality within the vehicle's interior. It filters the air that comes from outside, trapping and removing various contaminants and particles, such as dust, pollen, mold spores, and other fine airborne debris. This filtration process ensures that the air inside the vehicle is cleaner and healthier to breathe. For individuals who have allergies, a cabin air filter is particularly valuable. It helps reduce allergens, such as pollen and mold, making the cabin environment more comfortable and suitable for passengers with allergies. The cabin air filter also plays a role in safeguarding the vehicle's HVAC system. It prevents particles and debris from entering the HVAC components, helping to maintain the system's efficiency and prolong its lifespan.

Cabin air filter replacement

Replacing the cabin air filter is a relatively simple process that you can often do yourself. Refer the following steps:

1. Locate the filter: Find the cabin air filter housing, usually behind the glove compartment or under the dashboard.
2. Gather tools: Get a screwdriver or socket set for removing housing cover fasteners.
3. Open housing: Remove screws or clips securing the housing cover and open it.
4. Remove old filter: Slide out the old filter, noting its airflow direction.
5. Clean housing: Check for debris and clean the housing interior.
6. Install new filter: Insert the new filter, ensuring the correct orientation.
7. Close Housing: Carefully seal the housing, reattaching screws or fasteners.
8. Test HVAC: Turn on the HVAC system to confirm improved airflow.
9. Dispose of old filter: Dispose of the old filter following local regulations.
10. Record replacement: Note the date and mileage for future reference.