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Musty AC Smell in 2022 Outlander Sport - Cabin Air Filter?

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Melissa G. · rep 0 · May 22, 5:35 AM · 1 replies · solved · Question

Vehicle: 2022 Mitsubishi Outlander Sport LE

My 2022 Mitsubishi Outlander Sport LE, which I've had for about a year and a half (around 20,000 miles), has developed a really unpleasant musty, mildew-like smell when I turn on the AC or even just the fan. It's especially noticeable when I first start the car. I've heard this can be a sign of a dirty cabin air filter.

Is it too soon for the cabin air filter to be causing this issue? Where is it located in the Outlander Sport, and how difficult is it to change myself? Are there any specific types of filters I should look for, like activated charcoal ones, to help with odors? Any other tips to get rid of this smell would be great!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:35 AM

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ClearTheCode admin answer:

A musty smell from your AC system, especially after 1.5 years and 20,000 miles, is a very common complaint and often points directly to a dirty cabin air filter or moisture buildup in the HVAC system. It's definitely not too soon for this to be an issue.

  1. Causes of Musty Smell:

    • Dirty Cabin Air Filter: The filter traps dust, pollen, and other debris. Over time, it can become a breeding ground for mold and mildew, especially if it gets damp.
    • Evaporator Coil Mold: Moisture naturally condenses on the AC evaporator coil. If it doesn't dry properly, mold and mildew can grow on the coil itself, leading to the smell.

  2. Cabin Air Filter Location & DIY Steps (2022 Outlander Sport):

    • Location: The cabin air filter in your 2022 Mitsubishi Outlander Sport is typically located behind the glove compartment.
    • DIY Steps:
      • Empty Glove Box: Remove all contents from your glove compartment.
      • Release Stops: Open the glove box fully. On the sides, you'll usually find small tabs or stoppers that prevent it from opening too far. Gently push these inwards or upwards to allow the glove box to swing down further.
      • Access 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 pull out the old filter. Note the direction of the airflow arrow on the old filter.
      • Install New Filter: Insert the new filter, ensuring the airflow arrow points in the correct direction (usually downwards, towards the floor of the car).
      • Reassemble: Close the housing cover, reattach the glove box stoppers, and close the glove box.

  3. Filter Type:

    • You can use a standard particulate cabin air filter, which will effectively trap dust and pollen. However, to combat odors, an activated charcoal (carbon) cabin air filter is highly recommended. These filters have an additional layer of activated carbon that absorbs odors much more effectively than standard filters.

  4. Other Tips for Odor Removal:

    • AC System Cleaner: If the smell persists after changing the filter, you might have mold on the evaporator coil. You can purchase AC system cleaning sprays (often called 'bomb' or 'fogger' treatments) that are designed to kill mold and mildew in the HVAC system. Follow product instructions carefully.
    • Run Fan Before Shut-off: A good habit is to turn off your AC compressor (but leave the fan running) a few minutes before you reach your destination. This helps dry out the evaporator coil, preventing mold growth.
    • Check for Drains: Ensure the AC condensate drain is not clogged, as this can lead to water pooling and mold growth.

  5. When to See a Shop:

    • If the smell persists even after changing the filter and using an AC system cleaner.
    • If you suspect a clogged drain or a more significant issue within the HVAC system that requires professional inspection.
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