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Musty Smell & Weak AC in my 2020 Model 3 - Cabin Filter?

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Nicole W. · rep 0 · May 22, 5:25 AM · 1 replies · solved · Question

Vehicle: 2020 Tesla Model 3 Long Range

Hey everyone, I've been noticing a really musty, almost damp smell coming from the vents in my 2020 Tesla Model 3 Long Range lately. It's especially noticeable when I first turn on the AC. On top of that, the airflow seems weaker than it used to be, even when the fan is cranked up.

I've heard that Tesla cabin air filters can get pretty dirty, and some people even replace them themselves. Could this be the cause of my issues? I'm wondering if it's a DIY job I can tackle or if I should just take it to a service center.

Any tips or experiences with this? What tools would I need, and how difficult is it really for someone who's reasonably handy but not a professional mechanic?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:25 AM

0

ClearTheCode admin answer:

You're spot on, Sarah! A musty smell and reduced airflow are classic symptoms of a dirty or clogged cabin air filter in your 2020 Tesla Model 3. Over time, these filters accumulate dust, pollen, leaves, and moisture, which can lead to mold and mildew growth, causing that unpleasant odor and restricting airflow.

Here's what you need to know:

  1. Diagnosis & Replacement:

    • Symptoms: Musty smell, reduced HVAC airflow, increased fan noise.
    • DIY Difficulty: This is a very common DIY task for Tesla owners, generally considered moderately easy. Tesla recommends replacing them every 2 years or 24,000 miles, whichever comes first.
    • Tools Needed: You'll typically need a T20 Torx bit, a panel pry tool (plastic), and potentially a small flashlight. Many kits come with instructions and the necessary tools.
    • Process Overview: The filters are located behind the glove box. You'll need to remove the passenger side under-dash panel, disconnect a few electrical connectors, and then unclip the filter housing to pull out the old filters and insert the new ones. There are many excellent video tutorials online specific to the Model 3 that can guide you step-by-step.

  2. Causes of the Smell:

    • The primary cause is mold and mildew growing on the dirty cabin air filters and, in some cases, on the evaporator coil itself due to moisture.
    • Using your AC on 'recirculate' too often, especially in humid climates, can exacerbate moisture buildup.

  3. When to See a Shop:

    • If the musty smell persists or returns quickly after replacing the cabin air filters, it might indicate mold growth on the evaporator coil. A service center can perform an HVAC system cleaning or 'bomb' to eliminate this.
    • If, after replacing the filters, the airflow is still significantly weak, or you notice other issues with your AC system (e.g., not cooling effectively), there could be a more complex problem like a refrigerant leak or a failing blower motor, which requires professional diagnosis.
    • OBD Codes: For a simple dirty cabin filter, you won't typically get any OBD-II codes. If there were an issue with the HVAC system's electronics or sensors, then codes might appear, but that's less common for this specific symptom.

Tackling this DIY will likely resolve your issue and improve your cabin air quality significantly!

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