So, while looking around under the seats in a 2009 tahoe (to fix SRS light), I discovered that the cooled seats pull air through a small round white filter (and on to what looks like a CPU cooler).

anyone replaced these air filters? after 100,000 miles it's looking a little rank.

 

I don't know what they look like but I bet you might be able to clean them with canned air or maybe rinse them and let them air dry.