December 6, 2023
1. What is a cabin filter? The cabin filter is a different filter than the engine air filter. Both have similar construction but do very different things. While cabin filters vary depending on car manufacturer most have either a cardboard or plastic form that holds an accordion of folded paper impregnated with fiber or charcoal. 2. How does it work? The cabin filter filters the air coming from outside the vehicle into the passenger compartment. When air passes into the cabin filter, it’s pleats trap debris and contaminants like dust and pollen and prevent it from entering into the vehicle via air ducts and vents. 3. What type of debris does the cabin filter stop? A clean cabin filter will prevent dust, dirt, smoke, smog, pollen, mold spores and exhaust gases from entering the cabin through the heating, ventilation and air conditioning system. It also stops rodent droppings, bugs and leaves from entering the cabin. 4. What can happen if your cabin filter is dirty? The debris that the cabin filter traps eventually builds up to a point where it is no longer working efficiently and can prevent air flow into the cabin. 5. Are there risks if you don’t replace a dirty cabin filter? Yes. The most common risk is allergens entering the cabin, raising allergy and breathing concerns amongst passengers. Heating, ventilation and air conditioning systems will work harder trying to push air through a clogged cabin filter and ultimately can cause blower fan motor to overheat and fail. In winter months the windows won’t defog or defog slowly because of the reduced air flow coming through the vents. A musty smell coming from the air vents especially when the defrost or air conditioning is on. The smell can also indicate mold is present, which occurs when moisture due to normal temperature changes builds up inside the air vents and ducting because the air flow has been reduced or blocked by a dirty cabin filter. 6. How often should it be replaced? When it’s dirty obviously, but most car manufacturers suggest every 15,000 miles. If you commute or drive in a busy, air polluted metropolitan area your cabin filter will need replacement every 8,000 to 10,000 miles. And if you travel on dusty or dirt roads the cabin filter will need replacement even more often. 7. Is it hard to replace? Yes, it can be on some vehicles. Most of the time you will find the cabin filter is located under the vehicle dash or behind the glove box on the passenger side making it hard to access. No special tools are needed but part of the under dash needs to be removed to gain access to the filter. Once the filter is in sight it can be awkward to remove, sometimes they are stuck in place, this is where patience and knowledge are handy. Be careful not to break clips or body panels when doing it yourself.