Cabin Air Filter
What it is
The cabin air filter cleans the air coming into the passenger compartment through the heating and A/C vents. It is one of the easiest, cheapest maintenance items.
What it does
It traps dust, pollen and soot before they reach you. A clogged filter weakens airflow from the vents, causes odours and fogging, and makes the blower work harder.
Symptoms of failure
- Weak airflow from the vents
- Musty or dusty smell in the cabin
- Windows fogging up more than usual
- More dust and allergens inside
- Whistling or louder blower noise
Which vehicles need it
Most cars from the late 1990s on. It usually hides behind the glovebox.
Replacement cost
| DIY (part only) | $10–$30 |
|---|---|
| At a shop (parts + labor) | $40–$90 |
| Replacement interval | Typically every 12,000–15,000 miles (15,000–25,000 km) or once a year. |
| DIY difficulty | Easy (DIY) — often a 5-minute glovebox job, no tools |
| Recommended brands | Bosch, Fram, Mann-Filter, Denso |
Where to buy the part
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Frequently asked questions
How often should I change the cabin air filter?
About every 12,000–15,000 miles or once a year, sooner in dusty areas or heavy pollen. It is cheap and usually a quick DIY job behind the glovebox.
Why do my A/C vents smell musty?
A clogged, damp cabin filter is a common cause of musty vent odours. Replacing it (and using an evaporator cleaner) usually clears the smell and restores airflow.