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Squealing Noise from Engine Bay on 2017 Malibu - Serpentine Belt?

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Chris P. · rep 0 · May 22, 2:38 AM · 1 replies · solved · Question

Vehicle: 2017 Chevrolet Malibu LT

Hi all,

I've got a 2017 Chevrolet Malibu LT with the 1.5L turbo engine, currently at around 75,000 miles. For the past few weeks, 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 goes away after the engine warms up, but it's becoming more frequent.

I suspect it might be the serpentine belt, but I'm not entirely sure. Are there any common issues with the belts or tensioners on these Malibus? What should I look for to confirm it's the belt, and is this a DIY-friendly replacement job?

Thanks for any guidance!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:38 AM

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ClearTheCode admin answer:

A squealing noise from the engine bay, particularly on startup or in damp conditions, is a classic symptom of a worn serpentine belt or a failing belt tensioner/pulley on your 2017 Chevrolet Malibu LT. At 75,000 miles, it's definitely within the range where these components can start to show wear.

Here's how to diagnose and address it:

  1. Visual Inspection: With the engine off and cool, carefully inspect the serpentine belt. Look for:
    • Cracks, fraying, or missing ribs.
    • Glazing (a shiny, smooth appearance on the ribbed side).
    • Contamination (oil, coolant) on the belt.
  2. Check Pulleys and Tensioner: While inspecting the belt, also check the idler pulleys and the automatic belt tensioner. Spin each pulley by hand (engine off) to feel for roughness or excessive play. The tensioner should apply consistent pressure to the belt.
  3. Water Test (Caution!): With the engine running and the squeal present, carefully and briefly spray a small amount of water onto the ribbed side of the belt. If the squeal temporarily stops or changes, it confirms the belt is the source.

Causes of the squeal:

  • Worn or stretched serpentine belt.
  • Failing belt tensioner (loss of tension).
  • Worn or seized idler pulley or accessory pulley (alternator, AC compressor, power steering pump).
  • Contamination on the belt or pulleys.

DIY-friendliness: Replacing the serpentine belt on a 1.5L Malibu is generally considered a moderately DIY-friendly job. You'll need a serpentine belt tool (or a long breaker bar/ratchet) to release the tensioner, and a diagram of the belt routing. It's a good idea to replace the tensioner and idler pulleys at the same time if they show any signs of wear.

When to see a shop:

  • If you're uncomfortable working around moving engine parts or can't access the belt/tensioner easily.
  • If the squeal persists after replacing the belt and tensioner, indicating a potential issue with an accessory component (alternator, AC compressor, etc.).
  • If you notice any other unusual noises or a check engine light, as a failing accessory could also be the root cause.
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