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Musty Smell & Low Airflow - 2020 Equinox Cabin Air Filter DIY

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Mike T. · rep 0 · May 25, 1:42 AM · 1 replies · solved · Question

Vehicle: 2020 Chevrolet Equinox LT

My 2020 Chevrolet Equinox LT (2.0L turbo) has been having some issues with the HVAC lately. The airflow from the vents seems weaker than usual, and there's a distinct musty, almost mildew-like smell, especially when I first turn on the AC or fan. I've heard this could be a clogged cabin air filter.

Is this something I can easily replace myself? Where is the cabin air filter located in a 2020 Equinox, and what tools, if any, will I need? Any tips or tricks for getting it done without too much hassle?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:42 AM

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ClearTheCode admin answer:

You're on the right track! The symptoms you're experiencing with your 2020 Chevrolet Equinox LT – reduced airflow and a musty smell – are classic signs of a clogged cabin air filter. This is a very common and straightforward DIY maintenance item.

Location & DIY Steps:

  1. Location: In most 2020 Chevrolet Equinox models, the cabin air filter is located behind the glove box.
  2. Tools: You typically won't need any special tools, maybe just a small flathead screwdriver or trim removal tool to help with clips, though often it's tool-free.
  3. Procedure:
    • Empty Glove Box: Remove all contents from your glove box.
    • Drop Glove Box: Open the glove box. On the right side, there's usually a small damper string or arm that needs to be detached. On the sides of the glove box, there are often two stoppers or tabs that you'll need to push inwards to allow the glove box to swing down further.
    • Access Filter Housing: Once the glove box is fully lowered, you'll see a rectangular plastic cover (the filter housing door) behind it. There might be clips or small tabs holding it in place.
    • Remove Old Filter: Unclip or unlatch the cover and pull out the old cabin air filter. Note the direction of the airflow arrow on the old filter.
    • Install New Filter: Insert the new cabin air filter, ensuring the airflow arrow points in the correct direction (usually down, towards the floor of the vehicle).
    • Reassemble: Reattach the filter housing cover, swing the glove box back up, and reattach the damper string/arm and side stoppers.

Causes of Symptoms & When to See a Shop:

  • Clogged Filter: Over time, the filter collects leaves, dust, pollen, and other debris, restricting airflow.
  • Moisture/Mildew: If moisture gets trapped in the HVAC system (e.g., from AC condensation not draining properly), it can lead to mildew growth on the evaporator core, causing the musty smell. The filter can also become a breeding ground if it gets wet.

While replacing the cabin air filter will likely solve your airflow and smell issues, if the musty smell persists even with a new filter, it could indicate mildew growth on the evaporator core. In that case, you might need an HVAC system cleaning service (often called an evaporator cleaning or AC refresh) performed by a professional. This involves spraying a specialized cleaner directly into the system to kill mold and mildew.

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