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Squealing noise from engine on 2016 Altima 2.5L

0

Mike T. · rep 0 · May 25, 1:56 AM · 1 replies · solved · Question

Vehicle: 2016 Nissan Altima 2.5 S

My 2016 Nissan Altima 2.5 S has recently developed a loud squealing noise, especially noticeable on cold starts or when I first turn the steering wheel. It sounds like it's coming from the front of the engine compartment. The car has about 90,000 miles on it now.

The noise seems to lessen a bit once the engine warms up, but it's still there sometimes, particularly when I'm idling or turning the wheel at low speeds. I'm worried it might be something serious.

Could this be the serpentine belt, or perhaps a pulley? Is this a common issue for this model year, and is it a difficult DIY replacement if it is the belt?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:56 AM

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A squealing noise from the front of your 2016 Nissan Altima's engine at 90,000 miles is a very common symptom of a worn serpentine belt or a failing accessory pulley. Given your description, it's highly likely one of these components is the culprit.

Here's a breakdown and what to do:

  1. Inspect the Serpentine Belt:
    • Visually inspect the belt for cracks, fraying, glazing (a shiny, smooth appearance), or missing ribs. A glazed belt can slip and squeal.
    • Check the tension. While you can't manually adjust tension on most modern systems, a very loose belt could be a sign of a failing tensioner.
  2. Check Pulleys:
    • With the engine off and cool, carefully try to wiggle each pulley (alternator, power steering pump, AC compressor, idler pulley, tensioner pulley). Any excessive play or grinding sensation indicates a failing bearing.
    • Spin each pulley by hand. They should spin smoothly and quietly. A rough or noisy spin points to a bad bearing.
  3. Causes of Squealing:
    • Worn Belt: The most common cause. Over time, the rubber hardens and loses grip.
    • Misaligned Pulleys: Less common, but can cause uneven wear and noise.
    • Failing Tensioner: The automatic tensioner can lose its spring tension, causing the belt to slip.
    • Failing Accessory Bearing: A bearing in the alternator, AC compressor, or idler pulley can seize or become noisy.
  4. DIY Difficulty: Replacing the serpentine belt on a 2.5L Altima is generally considered a moderate DIY task. You'll need basic hand tools and potentially a serpentine belt tool to release the tensioner. It's crucial to diagram or take a photo of the belt routing before removal.
  5. When to See a Shop: If you're uncomfortable working around the engine, or if after inspection you suspect a failing pulley bearing (which might require specialized tools or more extensive disassembly), it's best to take your Altima to a trusted mechanic. Neglecting a squealing belt can lead to it breaking, which will leave you stranded and without power steering or charging.
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