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Musty smell from AC and reduced airflow in my 2018 Model 3 - Cabin filter?

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Amanda S. · rep 0 · May 22, 5:27 AM · 1 replies · solved · Question

Vehicle: 2018 Tesla Model 3 Long Range

Hey everyone,

I've noticed a persistent musty, almost mildew-like smell coming from the AC vents in my 2018 Tesla Model 3 Long Range. It's especially noticeable when I first turn on the climate control. Lately, it also feels like the airflow isn't as strong as it used to be, even when the fan is set high.

I've had the car since new and haven't replaced the cabin air filters yet. Could this be the culprit? I'm pretty handy and usually do my own maintenance when possible. Is replacing the cabin air filters a DIY job on these Model 3s, or is it something better left to a service center?

Any advice or experience with this issue would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

It sounds like you've accurately diagnosed the problem, Sarah! A musty smell and reduced airflow are classic symptoms of dirty or clogged cabin air filters in your 2018 Tesla Model 3. Over time, these filters accumulate dust, pollen, leaves, and moisture, which can lead to mold and mildew growth, causing the unpleasant odor and restricting air movement.

Here's what you should know:

  1. Cause: The primary cause is the natural accumulation of airborne particles and moisture within the HVAC system, which gets trapped by the filters. Tesla Model 3s actually have two cabin air filters, located behind the glove box.
  2. Maintenance Interval: Tesla generally recommends replacing the cabin air filters every 2 years or 24,000 miles, whichever comes first. Given your 2018 model, it's definitely time for a replacement if they haven't been changed yet.
  3. DIY Feasibility: Replacing the cabin air filters in a Model 3 is a common DIY task, but it can be a bit fiddly due to the location. You'll need some basic tools, including a trim removal tool and a T20 Torx bit. Many owners find it manageable by following detailed video tutorials available online. The process involves removing the passenger footwell trim, disconnecting some electrical connectors, and then accessing the filter housing.
  4. Steps (General Overview):
    • Park the car and power it off.
    • Remove the passenger side footwell trim panels.
    • Disconnect the light and speaker wires.
    • Unscrew the filter housing cover.
    • Remove the old filters (note their orientation).
    • Clean any debris in the housing.
    • Insert the new filters, ensuring correct orientation.
    • Reassemble everything in reverse order.
  5. When to See a Shop: If you're uncomfortable with the tight space, working with trim pieces, or disconnecting electrical components, it's best to schedule an appointment with a Tesla Service Center or a reputable independent shop. They can perform the replacement quickly and ensure everything is reassembled correctly. Additionally, if the musty smell persists after replacing the filters, it might indicate a deeper issue like mold growth on the evaporator coil, which would require professional cleaning or treatment.
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