How do you know if your filter needs to be replaced?

If the air coming out of your vents smells a little funny—like mildew or funk—or if your windshield fogs up with the A/C on, your Volkswagen may have a clogged cabin filter. Many manufacturers recommend replacing the cabin filter, or pollen filter, as part of its scheduled maintenance.

Cabin Air Filter Service Interval: 

-  15,000 to 25,000 miles