Replacing the Air Filter(s) In the Civic

Time for another automobile maintenance post for those who are following along. Was able to get this done before starting my new job and before the “heavy” snow arrived. This one is a two for one – the air filter AND the cabin air filter replacement. As most of my auto maintenance posts are, this one uses our 2009 Civic as the example, but this procedure is pretty straightforward and the same basic steps can be followed for most other vehicles.

Different manufacturers recommend different intervals on when to change your air filter. But the easy answer is to replace it when it gets dirty. I’m ashamed as to how long I waited, you can see the pictures below. The reason you need a filter is so dirt, dust, and other particles don’t get sucked into your engine, acting as abrasive little demons shortening the lifespan of your engine. The reason you need a clean air filter is because your engine needs a certain ratio of air (oxygen, really) to gasoline to operate efficiently. If your filter is too dirty then the flow of air is reduced, therefore making your mixture more rich with gasoline, causing you to use more gas than necessary to run your engine. So you want a clean filter.

If you don’t know how dirty the filter is, then take it out and look at it. If you don’t know where the filter is, crack open your user manual, check google, or just look for the tube that looks like it is sucking outside air into the engine. Here is where it is in the Civic:

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A zoomed in look shows the clamps you have to unclamp:
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Remove the filter housing, look at the filter, and decide whether it’s dirty enough to replace:

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Put the new filter where the old one, put the housing back, re-clamp, and you’re done. Take a look at this side by side:
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The second part of this post involves the cabin air filter replacement. This is important because it keeps harmful particles out of your AC system and also out of your lungs. Check your manual for where it is; it’s normally behind the glove box. Here is the step by step shown in pictures:

Press the sides where the glove box connects to the dash. Some cars you need a screwdriver or socket wrench:

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Ensure you have emptied the contents of your glove box or else they will end up on your floor. Behind the glove box is the housing for the cabin air filter. In the Civic, just press these side tabs and pull out.

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Here’s the old one next to the new one:

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Make sure your filter is installed properly (look at the arrows on the filter and the housing):
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Pretty simple stuff, huh? Took me about 5 minutes, mainly because I had to stop and snap pictures.

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