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Squealing Noise from Engine Bay on 2016 Outlander - Serpentine Belt?

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David L. · rep 0 · May 25, 4:11 AM · 1 replies · solved · Question

Vehicle: 2016 Mitsubishi Outlander GT

Hello everyone,

I have a 2016 Mitsubishi Outlander GT with about 85,000 miles. For the past few weeks, I've been hearing a loud 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 a few minutes, but it's getting more frequent and louder.

I suspect it might be the serpentine belt, but I'm not entirely sure. Is this a common issue for Outlanders at this mileage? What should I be looking for if I try to inspect it myself? And how difficult is it to replace?

I want to make sure I address this before it potentially causes a bigger problem.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:11 AM

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ClearTheCode admin answer:

The squealing noise you're hearing from your 2016 Mitsubishi Outlander GT is indeed a classic symptom of a worn or loose serpentine belt, also known as the accessory drive belt. At 85,000 miles, it's definitely within the mileage range where these belts can start to show wear.

Here’s what you need to know and do:

  1. Inspect the Serpentine Belt:
    • Visually inspect the belt for cracks, fraying, missing ribs, or glazing (a shiny, smooth appearance on the ribbed side).
    • Check the tension. A loose belt can slip and squeal. While your Outlander likely has an automatic tensioner, it can sometimes fail or the belt can stretch.
    • Also, inspect the pulleys for any signs of wear, damage, or excessive wobble.
  2. Causes of Squealing:
    • Worn Belt: The most common cause. The rubber hardens and loses its grip.
    • Loose Belt: If the tensioner is failing or the belt has stretched.
    • Contamination: Oil, coolant, or other fluids on the belt can cause it to slip.
    • Failing Pulley Bearing: A bearing in one of the accessory components (alternator, power steering pump, AC compressor, idler pulley) can seize or become rough, causing the belt to drag and squeal.
  3. Replacement Interval: While there isn't always a strict mileage interval, serpentine belts are typically inspected at every major service and replaced as needed, often between 60,000 to 100,000 miles or if visual inspection shows significant wear.
  4. DIY vs. Professional:
    • DIY: Replacing a serpentine belt on an Outlander is generally a manageable DIY task for someone with moderate mechanical experience. You'll need to locate the automatic tensioner, relieve its tension, remove the old belt, and route the new one correctly. Make sure to draw a diagram of the belt path before removal.
    • Professional: If you're unsure, or if the squealing persists after a new belt, it's best to take it to a mechanic. They can accurately diagnose if the issue is a failing tensioner or one of the accessory pulleys, which might require more specialized tools or knowledge.

Ignoring a squealing belt can lead to it breaking, which will cause a loss of power steering, alternator charging, and potentially air conditioning, leaving you stranded.

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