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Musty Smell from AC and Weak Airflow in 2016 LaCrosse

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Mike T. · rep 0 · May 25, 2:47 AM · 1 replies · solved · Question

Vehicle: 2016 Buick LaCrosse Premium

Hi everyone,

I've got a 2016 Buick LaCrosse Premium, and lately, the air conditioning has been less than pleasant. When I turn on the AC, there's a distinct musty, almost moldy smell that comes through the vents. It's pretty strong for the first few minutes, then it fades a bit, but never completely goes away.

On top of that, I've noticed that the airflow from the vents seems weaker than it used to be, even on the highest fan setting. It feels like I'm not getting the full blast of air I should be.

Could this be related to the cabin air filter? I honestly don't remember the last time it was changed, if ever. Is this a common issue for the LaCrosse, and is it a DIY job?

Thanks for any advice!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:47 AM

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ClearTheCode admin answer:

The symptoms you're describing—a musty smell from the AC and reduced airflow—are classic indicators that your 2016 Buick LaCrosse Premium is in dire need of a cabin air filter replacement, and possibly an AC system cleaning. This is a very common issue across all makes and models, especially if the filter hasn't been changed regularly.

Here’s a breakdown of what's likely happening and how to address it:

  1. Cabin Air Filter:
    • Cause of Symptoms: A dirty cabin air filter restricts airflow, leading to weaker output from the vents. It also traps moisture, dust, pollen, and other debris, creating a perfect breeding ground for mold, mildew, and bacteria, which cause the musty odor.
    • Location: In most Buick LaCrosse models, the cabin air filter is located behind the glove box, making it a relatively straightforward DIY replacement.
    • Replacement: Consult your owner's manual or an online video for the exact steps. It typically involves opening or removing the glove box, unlatching a cover, and sliding out the old filter. Note the direction of airflow arrows on the old filter and install the new one facing the same way.
  2. Evaporator Coil Cleaning:
    • Cause of Smell: Even with a new filter, some mold and bacteria might have grown on the evaporator coil itself (located deep within the dashboard). When the AC runs, condensation forms on this coil, providing a moist environment for microbial growth.
    • Cleaning: After replacing the filter, you can purchase an AC evaporator cleaner spray (often called 'AC refresh' or 'odor eliminator'). These typically have a long tube that you insert into the fresh air intake or directly into the evaporator housing (if accessible) to spray a foam that cleans and disinfects the coil.

Maintenance & DIY:

  • Frequency: It's generally recommended to replace your cabin air filter every 15,000 to 30,000 miles, or at least once a year, especially if you drive in dusty environments or suffer from allergies.
  • DIY Friendly: Replacing the cabin air filter is one of the easiest DIY maintenance tasks.

When to See a Shop:

  • If the smell and weak airflow persist after replacing the filter and cleaning the evaporator: This could indicate a deeper issue, such as a clogged AC drain hose (which can lead to water pooling and mold), a failing blower motor, or an issue with the AC system itself.
  • If you're uncomfortable performing the cleaning: A shop can perform a more thorough AC system cleaning and inspection.
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