You can inspect the filter yourself. It's to the right of the right rear passenger's shoulder. It's a white fabric over the inlet to the fan duct. IIRC, you can shine a flashlight into the vent and see it. It is NOT replaceable.
I recently disassembled my friend's '08 with 143K miles of AZ dust in it. It was squeaky clean. If you transport shedding animals on a regular basis, it might be of concern.
In taxis and extremely dirty environments, fan clogging may be an issue, and not all years have the filter screen. I highly doubt you need it done unless you drive with big shaggy dogs everyday.
Steve
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