Breathe Easy: The Importance of Cabin Filters in Your Car and When to Replace Them

A cabin filter, also known as a cabin air filter, is a component in a car that helps filter the air entering the vehicle’s interior through the heating, ventilation, and air conditioning (HVAC) system. Its primary function is to clean the air by removing dust, pollen, allergens, pollutants, and other particulate matter, thereby providing a healthier and more comfortable environment for the passengers.

The frequency of replacing a cabin filter depends on several factors, such as the type of filter, the vehicle manufacturer’s recommendations, and the driving conditions. Generally, it is recommended to replace the cabin air filter every 12,000 to 15,000 miles, or once a year, whichever comes first. However, you should consult your vehicle’s owner’s manual for specific guidance on your particular make and model.

If you frequently drive in dusty or polluted environments, you may need to replace the cabin filter more often. Signs that your cabin filter may need replacement include reduced airflow from the HVAC system, persistent unpleasant odors, or increased allergic symptoms while inside the vehicle. Regularly changing the cabin air filter can help maintain good air quality and ensure the proper functioning of your car’s HVAC system.

How does the car’s Air Conditioning work with the Cabin Filter?

  1. the base of the windshield or near the front grille. This air can contain dust, pollen, allergens, and pollutants.
  2. Cabin filter: Before the air enters the A/C system, it passes through the cabin filter, which captures and removes the unwanted particles. This ensures that the air entering the HVAC system is cleaner and healthier for the passengers.
  3. Cooling and dehumidification: The now-filtered air is directed over the evaporator, a component that contains refrigerant. The refrigerant absorbs heat from the air, causing it to cool down and release moisture, which condenses on the evaporator’s surface. The moisture is then drained out of the A/C system.
  4. Blower fan: The cool, dry air is pushed by the blower fan through the ducts and vents inside the cabin, creating a comfortable environment for the passengers.
  5. Recirculation: Many vehicles have a recirculation mode, which allows the A/C system to reuse the interior air instead of drawing in fresh air from outside. In this case, the cabin filter still plays a role in filtering the recirculated air, ensuring it remains clean and free from contaminants.

If you find your Audi, BMW or VW to have a poor smell or its been a while since you have swapped out your interior cabin filter, head over and check out the quick and easy replacement cabin filters from Hengst Automotive.

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