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Squealing noise from engine bay on my 2016 Ford Explorer - Serpentine belt?

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Mike T. · rep 0 · May 25, 1:35 AM · 1 replies · solved · Question

Vehicle: 2016 Ford Explorer XLT

Hey Ford forum,

I've got a 2016 Ford Explorer XLT with the 3.5L V6 engine, just over 90,000 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 it up in the morning or when it's damp outside. It sometimes goes away after a few minutes of driving, but it's starting to get louder and last longer.

My first thought is the serpentine belt. It looks a bit worn, but not completely shredded. Could it be a tensioner or an idler pulley instead? I'm trying to figure out if this is something I can tackle myself or if I should take it to a shop. What's the typical lifespan of these belts on an Explorer?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:35 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 serpentine belt or a failing pulley. Given your 2016 Ford Explorer's mileage, it's definitely time to inspect these components.

Common Causes of Squealing:

  1. Worn Serpentine Belt: Over time, the rubber belt can harden, crack, or lose its tension, leading to slippage and noise. Contamination from oil or coolant can also cause it to slip.
  2. Failing Idler Pulley: These pulleys guide the serpentine belt. Their bearings can wear out, causing a squeal or grinding noise.
  3. Failing Tensioner Pulley: The tensioner maintains proper tension on the belt. If its bearing fails or the spring mechanism weakens, the belt can become loose and squeal.
  4. Accessory Component Bearing: Less commonly, the bearing in an accessory like the alternator, power steering pump, or A/C compressor could be failing, causing noise that might be mistaken for the belt.

Recommended Steps for Diagnosis & Maintenance:

  1. Visual Inspection: With the engine off and cold, carefully inspect the entire length of the serpentine belt. Look for cracks, fraying, missing ribs, or glazing (a shiny, smooth appearance). Also, check the tensioner for proper alignment and the pulleys for any wobble or excessive play.
  2. Water Test (Caution!): With the engine running and the squeal present, carefully spray a small amount of water onto the ribbed side of the belt. If the squeal temporarily stops, it strongly indicates a belt issue. If it changes but doesn't stop, it might point to a pulley.
  3. Isolate the Noise: A mechanic's stethoscope can help pinpoint the exact source of the noise by listening to each pulley and accessory.
  4. Replacement: If the belt is worn, replace it. It's often a good practice to replace the tensioner and idler pulleys at the same time, as they typically wear out around the same interval as the belt. Ensure you use the correct belt length and type for your 3.5L V6 Explorer.

Typical Lifespan & When to See a Shop:

  • Serpentine belts typically last between 60,000 to 100,000 miles, so your 90,000 miles is right in that range.
  • If you're comfortable with basic hand tools and can access the belt routing diagram, replacing the serpentine belt and pulleys can be a DIY job. There are many online tutorials available.
  • When to See a Shop: If you're unsure about diagnosing the exact source of the noise, if the noise persists after replacing the belt/pulleys, or if you're not comfortable working around moving engine parts. A failing belt can lead to loss of power steering, alternator function, and A/C, so it's important to address it promptly.
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