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Squealing Noise from Engine Bay on 2019 Envision - Serpentine Belt?

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Mike T. · rep 0 · May 25, 2:47 AM · 1 replies · solved · Question

Vehicle: 2019 Buick Envision Essence

I've got a 2019 Buick Envision Essence with around 55,000 miles. For the past few weeks, I've been hearing a distinct squealing noise coming from the engine bay, especially noticeable on cold starts or when the AC is running. It sounds like it's coming from the belt area.

Could this be the serpentine belt, and is it something I can inspect or replace myself? What are the signs of a failing belt or tensioner?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:47 AM

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Hi Emily,

A squealing noise from the engine bay, especially on cold starts or when accessories like the AC are engaged, is a very common symptom of an issue with the serpentine belt or its associated components. At 55,000 miles, it's definitely a good time to inspect these items on your 2019 Buick Envision.

Causes of Squealing:

  1. Worn or Cracked Serpentine Belt: The rubber can harden, crack, or become glazed, losing its grip on the pulleys.
  2. Loose Belt Tension: The automatic belt tensioner might be failing, not applying enough pressure to the belt.
  3. Worn Pulleys/Bearings: The bearings in the idler pulleys, tensioner pulley, or accessory pulleys (alternator, AC compressor, power steering pump if applicable) can wear out, causing friction and noise.
  4. Contamination: Oil, coolant, or other fluids on the belt can cause it to slip and squeal.

Inspection & DIY:

  • Visual Inspection: With the engine off and cool, inspect the serpentine belt for cracks, fraying, glazing (shiny appearance), or missing ribs. Check for any fluid leaks onto the belt.
  • Tensioner Check: Observe the tensioner while the engine is running (from a safe distance). It should maintain steady tension. If it's bouncing excessively, it might be failing.
  • DIY Replacement: Replacing a serpentine belt is a moderate DIY task. It typically involves identifying the tensioner pulley, using a wrench to relieve tension, removing the old belt, and routing the new one correctly. Always sketch a diagram or take a photo of the belt routing before removal. Be sure to use a high-quality replacement belt.

When to See a Shop:

  • If the noise persists after belt replacement, indicating a failing tensioner or accessory pulley bearing. Diagnosing specific pulley noise can be tricky without a mechanic's stethoscope.
  • If you're unsure about the replacement process or cannot safely access the belt.
  • If the belt breaks, as this will disable essential accessories like the alternator (leading to battery drain) and potentially the water pump (leading to overheating). Get it towed to a shop immediately.
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