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How often should you change cabin AC filter?

In general, though, most cabin air filters should be replaced somewhere between every 15,000 and 30,000 miles. You may also notice any of the following signs: Reduced air flow when climate control systems are on. Lingering unpleasant odors. via

How do I know if my cabin air filter is clogged?

Unpleasant, sometimes musty smells.

Visible debris entering the cabin.

Ineffective or less effective heating, cooling, defrosting, or defogging.

Increased noise from an overtaxed blower motor.

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What does a dirty cabin filter do?

Dirty or clogged cabin air filters will reduce the amount of air flowing from the vents. That affects cabin air temperature, which depends on a steady flow of air passing through the heater core, evaporator or both components. Not changing your cabin air filter will make your HVAC system work much harder. via