You can remove your car's glove box to pull out your Cabin Filter filter to check how dirty it is. Car and Driver recommends watching for the following signs that your cabin air filter needs to be replaced:
The vehicle's heating or cooling starts making excessive noise.
You can hear a whistling sound coming from the cabin air intake ducts.
Airflow is weak, even when the heat or air conditioner is on high.
There is a musty odor coming through the air in your vehicle.
How often should you change your filter?
All vehicles are different, but you should check the air filter every 15,000 to 30,000 miles, recommends AutoZone. You can change it sooner if you do a visual inspection and notice it’s dirty. You can also check your owner's manual, which should provide a more precise service schedule.
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