Where can I find a large selection of cabin air filters online?

no,just dirty air in your cabin.

Here's a link showing you where it's at. 2001 2004 Dodge Caravan Cabin Air Filter Check 2004 Dodge Caravan SXT 3 3L...

Yes, it does. You can get it for only $2.85 at jcwhitney.com! Check it out! http://www.jcwhitney.com/1997-2004-audi-a6-quattro/cabin-air-filter/p3038903d76y1997-2004j1.jcwx

There is a great manual you can order online that provides you with great step-by-step instructions to help you change your cabin air filter for your vehicle. I will attach the link for you here...

http://www.automotix.net/autorepair/diy/buy_access.html?type=init&make=mercedes_benz&model=c230&year=1999

There sure is!Check out this website: http://www.2carpros.com/articles/how-to-replace-an-air-cabin-filter-video

You can buycabin air filters for many different cars on this website: http://www.car-stuff.com/cabinairfilter.htmYou can choose from large variety of car selection that includes Audi, Buick,Toyota, Mercedez-Benz, Mini, Subaru, and many more.

You can purchase 2003 Mercedes-Benz C230 Cabin Air Filteron these websites: http://www.familycar.com/store/?Ntt=mercedes+benz+c230+bosch+cabin+air+filter&oes=true and http://www.car-stuff.com/2003mercedesbenzc230cabinairfilter.htm

Location of cabin air filter (under hood, passenger side), shown without the filter cover installed.

I'm not sure what the cabin filter is but the air filter is straight forward. With the hood open you should see the air box just inside on the right with the large induction hose going across and to the engine. The top of the air box should open with a couple of hooks or clamps and the air filter sits on top inside the open box.