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Loud Squealing from Engine on 2022 Jeep Cherokee - Serpentine Belt?

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Robert C. · rep 0 · May 22, 3:28 AM · 1 replies · solved · Question

Vehicle: 2022 Jeep Cherokee Trailhawk

Hey everyone,

I've got a 2022 Jeep Cherokee Trailhawk with the 3.2L V6, and lately, I've been hearing a really loud, high-pitched squealing noise coming from the engine bay. It's most noticeable on cold starts, especially when it's damp or raining outside, and sometimes when I turn the steering wheel all the way. It usually quiets down after a few minutes of driving, but it's pretty embarrassing.

I'm guessing it's the serpentine belt, but I'm not sure if it's just a worn belt or if something else might be going on, like a pulley. The Jeep only has about 35,000 miles on it, which seems a bit early for a belt to fail, but maybe not? What should I be looking for?

Any thoughts or advice on diagnosing this would be great!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:28 AM

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ClearTheCode admin answer:

A loud squealing noise from the engine bay, especially on cold starts or in damp conditions, is a classic symptom of an issue with the serpentine belt system. While 35,000 miles might seem early for a belt replacement, several factors can contribute to premature wear or noise. Here's how to diagnose and address it:

  1. Inspect the Serpentine Belt: With the engine off and cool, carefully examine the entire length of the belt. Look for:
    • Cracks or Fraying: Small cracks across the ribs or fraying along the edges are clear signs of wear.
    • Glazing: A shiny, smooth appearance on the ribbed side indicates the belt is hardened and losing grip.
    • Missing Ribs: Any missing sections of the belt's ribs.
    • Contamination: Oil, coolant, or other fluids on the belt can cause slippage and squealing.
  2. Check Pulleys and Tensioner: A worn belt isn't always the sole culprit. The noise can also come from a failing pulley or tensioner:
    • Automatic Belt Tensioner: The tensioner keeps proper tension on the belt. If it's weak or seized, the belt can slip. Look for excessive vibration or play in the tensioner pulley.
    • Idler Pulleys: These guide the belt. Check them for excessive play, grinding noises when spun by hand (engine off!), or wobble.
    • Accessory Pulleys: Spin each accessory pulley (alternator, power steering pump, AC compressor, water pump) by hand (engine off!) to check for rough bearings, resistance, or wobble. A failing bearing in one of these accessories can cause squealing.
  3. Causes of Squealing:
    • Worn Belt: The most common cause.
    • Misaligned Pulley: If a pulley is slightly out of alignment, it can cause the belt to rub and squeal.
    • Weak Tensioner: Insufficient tension allows the belt to slip.
    • Failing Accessory Bearing: A bearing in the alternator, power steering pump, or AC compressor can seize or become rough, causing the belt to squeal as it tries to turn it.

When to See a Shop:

If a visual inspection doesn't clearly identify the problem, or if you suspect a failing tensioner or accessory pulley, it's best to have a professional mechanic diagnose it. They can use specialized tools to pinpoint the exact source of the noise and ensure any replacement parts are installed correctly. Ignoring a persistent squeal can lead to a broken belt, which can leave you stranded and potentially cause damage if it takes out other components.

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