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I just bought the smelliest 2014 CLA 250. Smells terrible ? Waiting on new air filter. In the meantime trying to neutralize odor by spraying air cleaner in vents & air intake. But where’s IS the dang air intake? I see the two in each corner of the dash. But not any on the floor or under the hood.
 

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Try running the air conditioner for a bit and see if it softens the smell.
 

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The smells mostly not coming from the filter. It is more likely from the A/C evaporator coil. If you are not clean it, the smell will come again even if you change the filter. I personally never tried it, but heard good thing about KOOL-IT. You can find tons of video in YouTube how to use it. Good luck!
 

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There are pending lawsuits in many states vs MBUSA over what appears to be a design flaw issue in several models.
 

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Klima Cleaner by nextzett works well. The smell will eventually come back next year. And you’ll probably have to do it again, but it works. Probably best to use whenever you change your cabin air filter. Simply changing the filter won’t remove the odor.
 
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