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Musty smell from AC in my 2021 Model Y – time for a cabin filter change?

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Mike T. · rep 0 · May 22, 5:26 AM · 1 replies · solved · Question

Vehicle: 2021 Tesla Model Y Long Range

Hi everyone,

I've got a 2021 Tesla Model Y Long Range, and lately, when I turn on the AC or even just the fan, there's a distinct musty, almost mildew-like smell coming from the vents. It's especially noticeable when I first start the car. I've heard this is a common issue and often points to the cabin air filters.

Is this something I can tackle myself? I'm pretty handy with basic DIY car maintenance. What tools would I need, and how difficult is the process for a Model Y? Also, how often should these filters typically be replaced?

Any tips or guides would be super helpful!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:26 AM

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ClearTheCode admin answer:

A musty smell from your 2021 Tesla Model Y's HVAC system is a very common indicator that your cabin air filters are due for replacement. This is a fantastic DIY project for most owners and can significantly improve your cabin air quality.

Here's a breakdown:

  1. Diagnosis: The musty smell is typically caused by moisture, dust, pollen, and other debris accumulating on the filters, creating a breeding ground for mold and bacteria. Reduced airflow can also be a symptom.

  2. Tools Needed:

    • New Tesla Model Y cabin air filters (usually two, often sold as a set).
    • Torx T20 screwdriver.
    • Plastic trim removal tool (optional, but helpful).
    • Flashlight.
    • Gloves (optional).

  3. DIY Steps for Replacement:

    • Access: The cabin air filters are located behind the glove box on the passenger side. You'll need to remove the passenger footwell cover and potentially some side trim pieces.
    • Unscrew: Locate and remove the T20 screws holding the lower dash panel and the filter access panel.
    • Remove Old Filters: Carefully pull out the old filters. Note their orientation (airflow direction) as you remove them.
    • Clean (Optional but Recommended): While the filters are out, you can use an HVAC coil cleaner (specifically designed for automotive use) to spray into the evaporator coil area to kill any remaining mold spores. Follow product instructions carefully.
    • Install New Filters: Insert the new filters, ensuring they are oriented correctly (airflow arrow pointing towards the rear of the vehicle).
    • Reassemble: Replace all panels and screws in reverse order.

  4. Frequency: Tesla recommends replacing cabin air filters every 2 years or 24,000 miles, whichever comes first. However, if you live in a dusty environment, frequently drive with windows open, or notice smells sooner, you might need to replace them annually.

When to See a Shop: If replacing the filters and cleaning the evaporator coil doesn't resolve the smell, or if you experience other HVAC issues like complete loss of airflow or unusual noises, it might indicate a more complex problem with the HVAC system (e.g., a clogged drain, refrigerant leak, or blower motor issue). In such cases, it's best to schedule service with Tesla for a professional diagnosis.

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