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Squealing Noise from Engine Bay on 2020 Acadia - Serpentine Belt?

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James R. · rep 0 · May 22, 3:45 AM · 1 replies · solved · Question

Vehicle: 2020 GMC Acadia SLT

Hi all,

I've got a 2020 GMC Acadia SLT with the 3.6L V6 engine, just hit about 60,000 miles. For the past week or so, I've been hearing a distinct squealing noise coming from the engine bay, especially when I first start the car in the morning or when it's damp outside. It sometimes goes away after the engine warms up, but not always.

It sounds like it's coming from the front of the engine. Could this be the serpentine belt, or maybe one of the pulleys? I haven't noticed any issues with power steering or AC, but the noise is getting annoying.

What should I be looking for, and is this something I can tackle myself or should I take it to a mechanic?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:45 AM

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ClearTheCode admin answer:

A squealing noise from the engine bay, especially on startup or in damp conditions, is a classic symptom of a worn or misaligned serpentine belt, or a failing accessory pulley. Given your 2020 GMC Acadia's mileage of 60,000, it's a prime candidate for a belt inspection or replacement.

Here's a breakdown of potential causes and actions:

  1. Serpentine Belt Wear: Over time, the rubber in the serpentine belt can harden, crack, or become glazed, losing its grip on the pulleys. This causes it to slip, producing the squealing sound. Damp conditions exacerbate this as water reduces friction.
  2. Pulley Issues: The belt runs over several pulleys, including the tensioner, idler pulleys, alternator, power steering pump, AC compressor, and water pump. If any of these pulleys have worn bearings, they can seize or become rough, causing the belt to squeal or even fray.
    • Tensioner: A failing belt tensioner can also cause the belt to lose proper tension, leading to slippage and noise.

DIY Inspection Steps:

  • Visual Check: With the engine off and cool, inspect the serpentine belt for cracks, fraying, glazing (shiny appearance), or missing ribs. Also, check for any debris lodged in the pulley grooves.
  • Wiggle Test: Gently try to wiggle each pulley. Any excessive play or grinding sounds when spun by hand (engine off!) indicates a bad bearing.

When to See a Shop:

  • If Unsure: If you're not comfortable inspecting the belt or pulleys yourself, or if you can't pinpoint the source of the noise.
  • Belt Replacement: While replacing a serpentine belt can be a DIY job for some, it requires proper tools and knowledge of the belt routing. If a pulley needs replacement, specialized tools might be necessary.
  • Persistent Noise: If the noise continues after a new belt, it strongly suggests a failing pulley or accessory, which a professional can diagnose accurately.

Ignoring a squealing belt can lead to it breaking, which will cause your vehicle to lose power steering, AC, and potentially overheat if the water pump stops turning.

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