Cabin air filters clean the incoming air and remove allergens, and according to the Car Care Council, should be replaced every 12,000 to 15,000 miles, or per the owner’s manual.
The cabin air filter helps trap pollen, bacteria, dust and exhaust gases that may find their way into a vehicle’s air conditioning and heating and ventilation systems. The filter also prevents leaves, bugs and other debris from entering the heating, ventilating and air-conditioning (HVAC) system.
A dirty or clogged cabin air filter can cause musty odors in the vehicle and cause contaminants to become so concentrated in the cabin that passengers actually breathe in more fumes and particles when riding in the car compared to walking down the street. A restricted cabin air filter can also impair airflow in the HVAC system, possibly causing interior heating and cooling problems, important for staying comfortable this winter. Over time, the heater and air conditioner may also become damaged by corrosion.
Most filters are accessible through an access panel in the HVAC housing, which may be under the hood or in the interior of the car. An automotive service technician can help locate the cabin filter and replace it according to the vehicle’s owner manual. Some filters require basic hand tools to remove and install the replacement filter; others just require your hands. Filters should not be cleaned and reinstalled; instead, they should be replaced.