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Squealing Noise from Engine Bay - 2019 ILX Serpentine Belt?

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Mike T. · rep 0 · May 22, 4:59 AM · 1 replies · solved · Question

Vehicle: 2019 Acura ILX 2.4L

Hey everyone, I've got a 2019 Acura ILX with the 2.4L engine, just under 50,000 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 gets louder when I turn the steering wheel.

I'm thinking it might be the serpentine belt, but I'm not entirely sure. Is 50,000 miles a typical time for these belts to start making noise on an ILX? What should I look for to confirm it's the belt, and is this a DIY job or something best left to a mechanic?

Also, could this be related to the power steering, since it sometimes gets louder with steering input?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:59 AM

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ClearTheCode admin answer:

The squealing noise you're hearing from your 2019 Acura ILX, especially on startup, in damp conditions, and when turning the steering wheel, is a classic symptom of a worn or loose serpentine (drive) belt. At just under 50,000 miles, it's a reasonable time for the belt to start showing signs of wear, although many can last longer.

Here's what you should do:

  1. Visual Inspection:
    • With the engine off and cool, open the hood and locate the serpentine belt. It's the single long belt that drives multiple accessories (alternator, A/C compressor, power steering pump if applicable, etc.).
    • Inspect the belt for cracks, fraying, glazing (a shiny, smooth appearance on the ribbed side), or missing ribs. Any of these are signs of wear.
    • Also, check the tensioner pulley and idler pulleys for excessive wobble or noise when the engine is running (use a stethoscope or long screwdriver to listen carefully).
  2. Belt Dressing (Temporary Fix): While not a permanent solution, a temporary application of belt dressing can sometimes quiet a squealing belt. If the noise stops, it strongly confirms the belt is the culprit.
  3. Replacement:
    • DIY Difficulty: Replacing the serpentine belt on an ILX 2.4L is generally considered a moderate DIY job. You'll need to relieve tension from the automatic belt tensioner using a wrench (usually a 14mm or 19mm, or a square drive for a breaker bar), remove the old belt, and route the new one correctly. Make sure to draw a diagram or take a picture of the belt routing before removal.
    • Parts: Purchase a high-quality OEM or equivalent aftermarket serpentine belt.

Causes of Squealing:

  • Worn Belt: The rubber hardens and loses its grip, especially when cold or wet.
  • Loose Belt: The automatic tensioner might be failing, or the belt might have stretched slightly.
  • Contamination: Oil, coolant, or other fluids on the belt can cause it to slip and squeal.
  • Failing Pulley/Bearing: A failing bearing in one of the accessory pulleys (alternator, A/C compressor, idler pulley, tensioner pulley) can also cause noise, sometimes mimicking a belt squeal.

Power Steering Connection:

Yes, the power steering pump (if hydraulic, though many newer ILX models are electric power steering) is driven by the serpentine belt. If the belt is slipping, it can cause a temporary loss of power to the pump, leading to increased noise when the pump is under load (like turning the steering wheel).

When to See a Shop:

  • If the noise persists after replacing the belt.
  • If you're uncomfortable with the DIY replacement or routing of the belt.
  • If you suspect a failing accessory pulley or tensioner, as these require more specialized tools or expertise.
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