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Musty Smell & Reduced AC Airflow in My 2020 Model 3 - Cabin Filter DIY?

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Kevin B. · rep 0 · May 22, 5:27 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 AC vents in my 2020 Tesla Model 3 Long Range lately. It's especially noticeable when I first turn on the climate control.

On top of that, the airflow seems a bit weaker than it used to be, even when I crank up the fan speed. I've heard that cabin air filters can get pretty dirty in Teslas and cause these kinds of issues.

Has anyone tackled replacing their cabin air filter themselves? Is it a straightforward DIY, or should I just schedule service? Any tips or specific filters you recommend? Thanks in advance!

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode Admin Answer:

You're absolutely right, Sarah! A musty smell and reduced airflow are classic signs of a dirty or clogged cabin air filter in your 2020 Tesla Model 3. This is a very common maintenance item and a popular DIY project for Tesla owners.

Causes:

  • Clogged Filters: Over time, the cabin air filters accumulate dust, pollen, leaves, and other debris, restricting airflow.
  • Moisture Buildup: The evaporator coil can retain moisture, especially in humid climates, leading to mold and mildew growth on the filters or within the HVAC system, causing that musty odor.

DIY Cabin Air Filter Replacement Steps:

  1. Purchase Filters: You'll need two new HEPA cabin air filters. Tesla recommends replacing them every 2 years or 24,000 miles, but in dusty or humid environments, more frequently might be necessary.
  2. Access: Open the passenger side front door. You'll need to remove the passenger footwell underpanel and the side panel of the center console.
  3. Remove Old Filters: Locate the filter housing cover, usually held by a few clips or screws. Carefully pull out the old filters, noting their orientation. Be prepared for some dust and debris to fall out.
  4. Clean Housing (Optional but Recommended): While the filters are out, you can use a vacuum to clean any debris inside the housing. Some owners also use an HVAC coil cleaner spray (ensure it's safe for automotive use) to address any mold on the evaporator, following product instructions carefully.
  5. Install New Filters: Insert the new filters, ensuring the airflow arrows point towards the rear of the vehicle.
  6. Reassemble: Reattach the filter housing cover, then reinstall the side panel and the footwell underpanel.
  7. Test: Turn on your climate control to verify improved airflow and reduced odor.

When to See a Shop:

  • If the musty smell persists even after replacing the filters and cleaning, it might indicate a deeper issue with the HVAC system, such as significant mold growth on the evaporator coil that requires professional cleaning or replacement.
  • If you experience any unusual noises from the fan or climate system, or if the airflow issue isn't resolved, a service appointment would be advisable to diagnose potential blower motor or other HVAC component problems.

This DIY typically takes about 30-60 minutes and can save you a service visit cost.

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