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Squealing Noise from Engine Bay - 2020 GMC Acadia SLT Belt Issue?

0

Mike T. · rep 0 · May 25, 2:40 AM · 1 replies · solved · Question

Vehicle: 2020 GMC Acadia SLT

I've got a 2020 GMC Acadia SLT with about 45,000 miles on it. Lately, I've noticed a distinct squealing noise coming from the engine bay, especially on cold starts or when turning the steering wheel at low speeds. It seems to be more prominent when the engine is cold and tends to lessen as it warms up.

It sounds like it's coming from the front passenger side of the engine. Could this be the serpentine belt, and is it something I can check or even replace myself?

What tools would I need to inspect it, and what should I look for to confirm it's the belt versus something else, like a pulley?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:40 AM

0

ClearTheCode admin answer:

A squealing noise from the engine bay, especially on cold starts or when turning, is a very common symptom of an issue with the serpentine belt or one of the pulleys it drives. Given your 2020 GMC Acadia SLT has 45,000 miles, it's a good time to inspect these components.

  1. Diagnosing the Squeal:
    • Serpentine Belt: The most common cause. As belts age, they can become glazed, cracked, or lose tension, leading to squealing. Moisture on the belt (like on a cold morning) can exacerbate this.
    • Pulleys/Bearings: A failing idler pulley, tensioner pulley, or accessory component (like the alternator, power steering pump, or A/C compressor) with a worn bearing can also produce a squealing or grinding noise.
  2. How to Inspect:
    • With the engine off and cool, visually inspect the serpentine belt for cracks, fraying, glazing (a shiny, smooth appearance), or missing ribs.
    • Check the belt tensioner: it should apply consistent tension to the belt. If it looks loose or wobbly, it might be failing.
    • Gently try to wiggle each pulley by hand (again, engine off). Any excessive play or grinding sensation indicates a bad bearing.
  3. Tools for Replacement (DIY):
    • A serpentine belt tool (a long wrench designed to fit the tensioner pulley bolt, often with various adapters) or a standard ratchet with the correct socket size for the tensioner.
    • A diagram of your belt routing (usually found under the hood or in your owner's manual).
    • New serpentine belt (ensure it's the correct length and number of ribs for your Acadia).
  4. Replacement Steps (General):
    • Locate the tensioner pulley.
    • Use the serpentine belt tool/ratchet to rotate the tensioner, relieving tension on the belt.
    • Carefully remove the old belt, noting its routing.
    • Install the new belt, ensuring it's correctly routed over all pulleys.
    • Release the tensioner slowly.
  5. When to See a Shop:
    • If, after replacing the belt, the squealing persists, indicating a faulty pulley or accessory component.
    • If you're uncomfortable working around engine components or lack the necessary tools.
    • If the noise is accompanied by other symptoms like dimming lights (alternator), difficulty steering (power steering), or loss of A/C (compressor), as these point to specific component failures.
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