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Bad smell from AC, only when humid or rain outside.

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Joined: Tue Jul 11, 2017 8:36 am
Year and Model: C30 2011
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Bad smell from AC, only when humid or rain outside.

Post by beauvafr »

I got that moldy smells rom AC some have. The smell only appears after rain, or on humid climate, and comes from the vents.

Here what I did to solve it, none of this worked.
  • Remove cabin filter, and put a AC cleaning solution with disinfectant directly to the evaporator (where the cabin filter is located)
    Spray the AC cleaning solution in the vent
    Let the AC work for couple of minutes
    Place a new cabin filter (charcoal activated)
The smeel goes away, masked by the scent. A couple days later, it comes back!!

I have also checked for water on the carpet, looking for a possible rooftop drain leak after a heavy rain. I found nothing. Anyway, the smeel is only coming from the vent, not the cabin itself.

I have run out of solution now..

Do you have any idea what I should do next?
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Re: Bad smell from AC, only when humid or rain outside.

Post by oragex »

You may do this - use the cleaning solution that you already have
Alternately, you can also engage the recirculating button and spray into the intake inside the cabin - I think it's above front passenger feet but not sure exactly where.

All these without the cabin air filter in place, but with the cover installed.

Don't use bleach, it may corrode the evaporator. Some use Lysol.
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Joined: Thu Jul 06, 2017 8:23 am
Year and Model: 2008 V50
Location: Austin Texas

Re: Bad smell from AC, only when humid or rain outside.

Post by GaryB1 »

A friend used these and had pretty good results. Meguiar's Air Freshener, New Car kits. He got it online from Walmart or someplace. It looks like a bug bomb for the house. You turn the car on, put the A/C on recirc and lock the top down on the cans and close the door until they have finished. He used two of them at the same time because the car had been smoked in. I don't know if it cleans or just masks odors, or how long it'll last, but it's been a couple months and so far seems good. My V50's previous owner loved Golden Retrievers and the back area has a distinct doggy odor when the direct sun hits it. I've been using Chemical Guys New Car spray, but I may try the Meguiar's Air Freshener kit if it doesn't help long term.
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