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Musty Smell & Weak AC in My 2020 Model 3 - Cabin Air Filter Replacement DIY?

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Rachel A. · rep 0 · May 22, 5:27 AM · 1 replies · solved · Question

Vehicle: 2020 Tesla Model 3 Long Range

Hey everyone,

I've noticed a pretty persistent musty 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, it feels like the airflow isn't as strong as it used to be, even when the fan is cranked up.

I've heard that this could be a sign that the cabin air filters need replacing. Is this a common issue for Model 3s around this age? I'm pretty handy and usually like to do my own maintenance when possible.

Has anyone here done the cabin air filter replacement themselves on a 2020 Model 3? How difficult is it, and what tools do I need? Any tips or tricks to make it easier would be greatly appreciated before I dive in!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:27 AM

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ClearTheCode admin answer:

Yes, a musty smell and reduced airflow are very common indicators that your Tesla Model 3's cabin air filters need replacement. Over time, these filters collect dust, pollen, and other airborne particles, and can also become a breeding ground for mold and mildew, especially in humid climates. Tesla recommends replacing them every 2 years or 24,000 miles, whichever comes first.

Here's a general guide for a DIY replacement on your 2020 Model 3:

  1. Preparation: Purchase two new Tesla Model 3 cabin air filters (often sold as a set). You'll need a T20 Torx driver, a trim removal tool, and possibly a small flathead screwdriver.
  2. Access the Filters:
    • Power off your vehicle from the touchscreen (Controls > Safety > Power Off).
    • Open the passenger side front door and locate the lower trim panel beneath the glove box. Use your trim removal tool to carefully pry off the two plastic clips holding it in place, then remove the panel.
    • Disconnect the electrical connector for the footwell light.
    • Locate the HVAC ducting. You'll need to remove a T20 Torx screw and then carefully detach the ducting to gain access to the filter housing.
  3. Remove Old Filters: The filter housing cover is held by a small clip or a T20 screw. Remove it. You'll see two filters stacked vertically. Carefully pull out the bottom filter first, then the top one. Note their orientation (airflow direction).
  4. Install New Filters: Insert the new filters, ensuring the airflow arrows point towards the rear of the vehicle. Install the top filter first, then the bottom one.
  5. Reassembly: Reattach the filter housing cover, re-secure the HVAC ducting, reconnect the footwell light, and reattach the lower trim panel with its clips.

Causes & Prevention: The primary cause is simply the filters doing their job and getting clogged. Regular replacement is key. If the smell persists after replacement, consider using an HVAC system cleaner designed to kill mold and mildew in the evaporator core.

When to See a Shop:

  • If the musty smell or poor airflow continues after replacing the filters and using an HVAC cleaner.
  • If you notice any unusual noises from the HVAC system.
  • If you receive any diagnostic messages on your Tesla's screen related to the climate control system (though this is rare for just a clogged filter).
  • If you're uncomfortable performing the DIY, a Tesla Service Center or certified independent shop can perform this service.
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