What does the cabin air filter do? The cabin air filte? an implementation that began appearing in vehicles in 200? cleans the air and Œprevents dus? polle? dirt and other pollutants from entering into the interior through the heatin? ventilation and air conditioning system. It catches dus? pollen and other airborne material that can make riding in a car unpleasan? particularly if you have allergies or other respiratory problems. How do you know you need the cabin air filter replaced? Theres reduced airflow through your HVAC syste? such as when you crank up the fan too high and you get more noise than results. There is persistent bad odors How is the cabin air filter replaced by a mobile mechanic? Old cabin air filter is removed from either behind the glove box or under the dash which is harder to get to Any debris is removed and the new filter is installed How important is having your cabin air filter replaced? Having the cabin air filter replaced keeps the air you breath clean and free of pollution. Recommendations on when it should be replaced vary by manufacturer as some say every 1?000 or 2?000 km? others longe? and how often can depend on how much you drive and where. Check the maintenance schedule in your owners manual. If you drive in heavy traffic in an urban area that has poor air qualit? you could need to replace the filter annually or even more often. Howeve? that also could be true in a desert climate where there is a lot of dust.