Most drivers have never heard of the cabin air filter, yet it decides how clean the air inside your car is. It is also one of the easiest parts to replace yourself.
What it does
The cabin air filter sits behind the glovebox on most cars and cleans the air coming through the vents. It traps dust, pollen and soot before they reach you, which matters a lot if you have allergies or drive in traffic.
Signs it is clogged
Weak airflow from the vents even on high fan, a musty smell when the fan runs, and fogging that clears slowly are all signs the filter is blocked. A clogged filter also makes the fan work harder.
How often to change it
Every 12,000 to 15,000 miles, or once a year, is a good rule. Change it more often if you drive on dusty roads or in heavy traffic.
Can you clean it instead?
You can tap out loose dust from a paper filter once, but they are cheap, so replacement is the better fix. Some cars use a washable filter that can be rinsed and reused.
Frequently asked questions
Does the cabin filter affect the engine?
No. That is the engine air filter, a separate part. The cabin filter only affects the air inside the car.
Can a dirty cabin filter cause smells?
Yes. Trapped moisture and dust can grow mildew, which you then smell through the vents.
See our car accessory guides for filters and interior air products.
