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Musty AC Smell & Low Airflow in 2022 CX-30 Select

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Mark S. · rep 0 · May 22, 4:52 AM · 1 replies · solved · Question

Vehicle: 2022 Mazda CX-30 Select

My 2022 Mazda CX-30 Select, with about 30,000 miles, has developed a really unpleasant musty smell coming from the AC vents, especially when I first turn it on. It also feels like the airflow isn't as strong as it used to be, even on higher fan settings.

I'm thinking it might be the cabin air filter. Is this a common issue for the CX-30? Where is it located, and how difficult is it to replace myself? Are there any specific types of filters (e.g., activated charcoal) that are better for odor control?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:52 AM

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Hi Emily,

That musty smell and reduced airflow are classic symptoms of a dirty or clogged cabin air filter, and it's a very common issue across all makes and models, including your 2022 Mazda CX-30 Select. At 30,000 miles, it's definitely due for a replacement.

Here's what you need to know:

  1. Cabin Air Filter Location:

    • In most Mazda CX-30 models, the cabin air filter is located behind the glove compartment. This makes it a relatively easy DIY job.

  2. DIY Replacement Steps:

    • Empty Glove Box: Remove all contents from your glove compartment.
    • Release Stops: Open the glove box fully. On the sides, you'll typically find small plastic tabs or 'stops' that prevent the glove box from opening too far. Gently push these inwards or upwards to allow the glove box to swing down further.
    • Access Filter Housing: Once the glove box is fully lowered or removed, you'll see a rectangular plastic housing, often with clips or a small latch. This is the cabin air filter housing.
    • Remove Old Filter: Unclip the housing cover and carefully pull out the old filter. Note the direction of the airflow arrow on the old filter (usually pointing downwards).
    • Install New Filter: Insert the new cabin air filter, ensuring the airflow arrow points in the correct direction (usually down). Close the housing cover and reattach the glove box stops.

  3. Types of Filters for Odor Control:

    • Standard Particle Filter: Good for trapping dust, pollen, and other airborne particles.
    • Activated Charcoal (Carbon) Filter: These are excellent for odor control. The activated carbon helps absorb unpleasant smells, making them a great choice if you're experiencing a musty odor. They might cost a little more but are often worth it for the improved air quality.

  4. Other Causes of AC Smell & When to See a Shop:

    • If replacing the cabin air filter doesn't resolve the musty smell, the issue might be mold or mildew buildup on the evaporator core within your AC system. This often requires a specialized AC system cleaning service, where a technician will spray a disinfectant foam into the evaporator housing.
    • If airflow remains poor even with a new filter, there could be an issue with the blower motor or ducting, which would warrant a professional inspection.
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