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Poor AC Airflow & Musty Smell in my 2021 Tucson - Cabin Filter?

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Mike T. · rep 0 · May 25, 2:04 AM · 1 replies · solved · Question

Vehicle: 2021 Hyundai Tucson SEL

Hey everyone, I've got a 2021 Hyundai Tucson SEL, and I've noticed a couple of issues recently. First, the AC airflow doesn't seem as strong as it used to be, even on full blast. Second, there's a slight musty smell coming from the vents, especially when I first turn on the AC. It's not terrible, but definitely noticeable.

I'm thinking it might be a clogged cabin air filter. Also, while I'm at it, should I check or replace the engine air filter too? My car has about 40,000 miles on it, and I don't think either has been changed since I bought it. Are these easy DIY jobs for a Tucson, and what kind of filters should I look for?

Thanks for any help!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:04 AM

0

ClearTheCode admin answer:

Your symptoms of reduced AC airflow and a musty smell in your 2021 Hyundai Tucson SEL strongly point to a clogged cabin air filter. It's also a good idea to check your engine air filter at 40,000 miles.

  1. Cabin Air Filter:

    • Function: Filters dust, pollen, and other airborne particles from the air entering your vehicle's cabin through the HVAC system.
    • Symptoms of Clog: Reduced airflow from vents, musty odors, and potentially increased strain on your blower motor.
    • Location: On most Hyundai Tucson models, the cabin air filter is located behind the glove compartment.
    • DIY Steps:
      1. Empty the glove compartment.
      2. Press in on the sides of the glove compartment to release the stops, allowing it to swing down further.
      3. Unclip the damper arm (if present) on the right side.
      4. Locate the filter housing cover (usually with clips or tabs) and remove it.
      5. Pull out the old filter, noting the airflow direction arrow.
      6. Insert the new filter, ensuring the airflow arrow points in the correct direction (usually down).
      7. Reassemble the housing cover, damper arm, and glove compartment.

  2. Engine Air Filter:

    • Function: Filters air entering the engine, protecting it from dirt and debris. A clean filter ensures optimal combustion and fuel efficiency.
    • Symptoms of Clog: Reduced engine performance, decreased fuel economy, and potentially a rough idle.
    • Location: Typically found in a black plastic airbox under the hood, usually connected to the intake manifold.
    • DIY Steps:
      1. Locate the air filter housing.
      2. Unclip the metal clips or unscrew the screws holding the housing cover in place.
      3. Carefully lift the cover and remove the old filter.
      4. Clean any debris from the airbox.
      5. Insert the new filter, ensuring it sits flush within the housing.
      6. Replace the cover and secure the clips/screws.

  3. Filter Types & Intervals:

    • Cabin Filter: Standard particulate filters are common, but activated charcoal filters can offer better odor reduction. Recommended replacement is usually every 15,000-30,000 miles or annually, depending on driving conditions.
    • Engine Filter: Standard paper filters are most common. Recommended replacement is typically every 30,000-45,000 miles, but inspect it regularly, especially if driving in dusty conditions.

When to See a Shop: If replacing both filters doesn't resolve your issues, particularly the musty smell or poor AC performance, you might have a more significant HVAC problem (e.g., evaporator coil mold, refrigerant leak, or a failing blower motor). In such cases, professional diagnosis is recommended.

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