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Musty AC Smell & Cabin Air Filter on 2022 Atlas

0

Mike T. · rep 0 · May 25, 3:22 AM · 1 replies · solved · Question

Vehicle: 2022 Volkswagen Atlas SE with Technology

Hi everyone,

My 2022 Volkswagen Atlas SE with Technology (V6 engine) has developed a really unpleasant musty smell coming from the AC vents, especially when I first turn it on. It's been getting worse over the last few weeks. The car only has about 25,000 miles on it, and I honestly can't remember ever changing the cabin air filter. I'm pretty sure it's the original one.

Could a dirty cabin air filter be causing this awful smell? Is it something I can change myself, and where is it located on the Atlas? Any tips on how to get rid of the smell for good would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:22 AM

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Hi Jessica,

You've hit the nail on the head! A musty smell from your AC vents, especially on a 2022 Volkswagen Atlas with 25,000 miles and an unserviced cabin air filter, is almost certainly due to a dirty filter and potential microbial growth in your HVAC system.

Here's what's likely happening and how to fix it:

  1. The Cabin Air Filter: This filter is designed to trap dust, pollen, leaves, and other airborne particles before they enter your car's cabin. Over time, it gets clogged with debris. If moisture gets trapped in the filter, it creates a perfect breeding ground for mold, mildew, and bacteria, leading to that unpleasant musty odor.

    • Location: On most Volkswagen Atlas models, the cabin air filter is located behind the glove compartment. It's a relatively straightforward DIY job.
    • DIY Replacement Steps:
      1. Empty your glove compartment.
      2. Locate the dampeners or clips on the sides of the glove compartment that allow it to drop down further. You might need to gently push in the sides or unclip a small string/arm.
      3. Once the glove compartment is dropped, you'll see a rectangular access panel (often with clips or tabs) behind it. This is where the filter housing is.
      4. Unclip the cover, pull out the old filter, noting the airflow direction arrow.
      5. Insert the new filter, ensuring the airflow arrow points in the correct direction (usually down).
      6. Reinstall the cover and reattach the glove compartment.

  2. Eliminating the Musty Smell: Replacing the filter is the first step, but if the smell persists, it means mold and bacteria have likely colonized the evaporator core.

    • Evaporator Cleaner: You can purchase an AC evaporator foam cleaner (e.g., from CRC, Kool-It, or similar brands). These products typically come with a long hose that you feed into the AC drain tube (usually located under the car) or sometimes directly into the blower motor housing. The foam expands, cleans the evaporator, and then drains out.
    • Run Fan on High: After replacing the filter and potentially using a cleaner, run your car's fan on high with the AC off for 10-15 minutes to thoroughly dry out the system. Do this periodically, especially after using the AC heavily, to prevent future moisture buildup.

  3. Preventative Maintenance:

    • Regular Filter Changes: Aim to change your cabin air filter every 15,000-20,000 miles or annually, more often if you drive in dusty conditions.
    • Turn Off AC Before Parking: A few minutes before reaching your destination, turn off the AC (but leave the fan running) to allow the evaporator to dry out, reducing moisture for mold growth.

When to See a Shop: If the smell persists after these steps, or if you're uncomfortable performing the filter change or using the evaporator cleaner, a professional shop can perform a more thorough HVAC system cleaning and inspection.

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