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This question already has an answer here:

My car seems to have a pretty bad smell in the air conditioning. WHat is the best way to flush out these smells?

marked as duplicate by DucatiKiller, Pᴀᴜʟsᴛᴇʀ2, Zaid, Fred Wilson, vini_i Dec 29 '15 at 0:13

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  • When asking a question here, please put the year/make/model you are asking about. This helps us give you a proper diagnosis. Some vehicles have cabin air filters while some do not. Some are easier to fix than others. Some topics lend to universal questions ... this one would have been better served with more info. @barbecue gives a very good answer. It would be better had they known if there was a cabin air filter as well. While not a primary cause, it can help to change it out sometimes. – Pᴀᴜʟsᴛᴇʀ2 Oct 10 '15 at 15:24
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Bad AC odors are usually related to poor drainage of condensation, which allows mold to grow.

There is a small drain hose which allows the condensation to drip out, but this can get clogged up or blocked by dirt.

If this is the cause, then simply cleaning out the drain may be enough to clear things up. A quick google for your car model and air conditioner drain will probably lead you to a diagram at least, and possibly a helpful video.

If the amount of mold is significant, you might need to clean the drain pan and evaporator coil. This could involve a lot of work under the dash, which I'd rather have a root canal than do myself, so I'd take it in.

You can get products that claim to kill the mold or neutralize the smell, but these are a temporary solution at best. As long as the drainage is poor, the smell will keep coming back. Fix the drainage first, then consider options for cleaning/deodorizing if the problem isn't resolved.

It's also possible that the smell could be something else, like a fluid leak. Usually you can tell by the nature of the smell. If it smells like dirty feet, or like a stagnant pond, it's probably mold. An acrid, chemical smell could be something burning, or a fluid leak.

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First, your Civic has a cabin air filter. Check it and change it because it may contain the bad smell.

That being said there are two ways to get rid of bad smells that i'm aware of, but neither is easy because you would need to a shop that has the equipment. The fist uses a machine that atomizes an antibacterial deodorizing solution while running the AC in recirculation mode to draw the mist through the system. The second uses a machine that produces ozone. Ozone is toxic to living things and kill bad smell bacterial and fungi. The treatment is usually done overnight.

  • I actually own a fit, friend owns civic – yuritsuki Oct 10 '15 at 3:53
  • @thinlyveiledquestionmark My bad, I know for a fact that Civics have a cabin air filter. While i'm not as sure abut the Fit Honda tends to put them in all their cars. – vini_i Oct 10 '15 at 3:57

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