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Loud squealing from AC blower in my 2020 Pathfinder

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Mike T. · rep 0 · May 25, 1:58 AM · 1 replies · solved · Question

Vehicle: 2020 Nissan Pathfinder SL

Hi everyone,

I'm dealing with an annoying issue in my 2020 Nissan Pathfinder SL. For the past month or so, I've been hearing a really loud squealing noise coming from behind the dashboard, specifically when I turn on the AC or heater fan. It's not a constant noise, but it's very prominent at lower fan speeds and sometimes gets louder or changes pitch with speed adjustments.

The airflow seems okay for now, but the noise is driving me crazy, and I'm worried it's a sign of something bigger failing. I've tried changing the cabin air filter, but that didn't make any difference. I'm wondering if this is a common problem for 2019-2021 Pathfinders and what the typical fix might be.

Could this be the blower motor going bad, or something else entirely? Any advice or shared experiences would be great before I take it in for service.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:58 AM

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ClearTheCode admin answer:

A loud squealing noise from behind the dashboard when your AC or heater fan is on is a very common indicator of an issue with the HVAC blower motor, especially at lower fan speeds. This is a frequent problem across many vehicle makes and models, including the 2020 Nissan Pathfinder.

Here's a breakdown of the likely causes and what you should do:

  1. Worn Blower Motor Bearings: The most common cause of a squealing or whining noise is worn-out bearings within the blower motor itself. Over time, these bearings can lose lubrication or accumulate dirt, leading to friction and noise. The noise often starts at lower speeds and can get louder or change pitch.
  2. Debris in the Blower Housing: Sometimes, leaves, small twigs, or other road debris can bypass the cabin air filter and get into the blower motor housing. As the fan spins, this debris can rub against the fan blades, creating a rattling, chirping, or squealing sound.
  3. Loose or Damaged Fan Blade: While less common, a fan blade could become loose or slightly damaged, causing it to wobble or strike the housing as it spins.

What to Do:

  • Inspect for Debris: Even though you changed the cabin air filter, it's worth a quick visual inspection of the blower motor itself. The blower motor is typically located under the passenger side of the dashboard. You might be able to remove it or at least see into the housing to check for visible debris.
  • Confirm the Source: Try to pinpoint the noise by listening closely while someone else operates the fan speed. This can help confirm it's indeed the blower motor.

When to See a Shop:

If you've checked for obvious debris and the noise persists, it's time to take your Pathfinder to a mechanic. They will:

  • Confirm the blower motor as the source of the noise.
  • Remove the blower motor for a thorough inspection.
  • Recommend either cleaning out any debris or, more likely, replacing the blower motor assembly. Replacement is a fairly straightforward job for a mechanic.

There are generally no OBD-II trouble codes associated with a noisy blower motor, as it's a mechanical wear issue rather than an electronic malfunction that would trigger the check engine light. Addressing it will restore quiet operation to your climate control system.

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