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The cabin air filter (also known as the pollen filter, AC filter, dust filter, hvac filter and hepa filter) in your 2009 Mercedes-Benz C300 cleans the air that you and your passengers breath inside of your car. You need to change it at least once a year or every 20,000 miles, whichever comes first. In addition to improving the air quality of your C300, replacing your cabin air filter will put less strain on your heating and air conditioning system and can increase your gas mileage. These filters are fairly inexpensive, so check out our parts page for great deals on a new one (tip: buy several, when you go to check the cabin air filter on your C300, you can easily swap it for a new one if it is dirty).
Not all Mercedes-Benzs have a cabin air filter and for some models, the inclusion of a cabin air filter depends on what trim level you have (Sport). If your C300 smells bad when you turn on the heater or air conditioner, or it seems like the fan doesn't blow air as well as it used to, replacing your cabin air filter is a likely the best fix! The video above shows you where the cabin air filter in your 2009 C300 is located and how to check it.
Learn how to diagnose and fix minor oil leaks in your car2009 Mercedes-Benz C300 Sport 3.0L V6
Coolant hoses wear out over time and need to be replaced - check 'em early and often2009 Mercedes-Benz C300 Sport 3.0L V6
You love your kids right? See how to properly secure their car seat.2013 Mercedes-Benz C300 4Matic Sport 3.5L V6
Flushing the coolant in your car is not that hard and will extend the life of your engine tremendously - learn how here!2009 Mercedes-Benz C300 Sport 3.0L V6
Driving with your phone pressed against your ear is illegal in many places. See how to talk hands free!2013 Mercedes-Benz C300 4Matic Sport 3.5L V6