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Squealing Noise from Engine Bay - 2018 911 Carrera S Serpentine Belt?

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Mike T. · rep 0 · May 25, 4:53 AM · 1 replies · solved · Question

Vehicle: 2018 Porsche 911 Carrera S

Hi all, my 2018 Porsche 911 Carrera S (991.2, 3.0L twin-turbo) has developed a high-pitched squealing noise, especially noticeable on cold starts and when turning the steering wheel at low speeds. It sounds like it's coming from the front/top of the engine bay.

I'm suspecting the serpentine belt. Is this a common issue for these models, especially around 30-40k miles? How difficult is it to inspect or replace the belt and tensioner myself? Are there any specific things I should look out for or tools I'd need?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:53 AM

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ClearTheCode admin answer:

A squealing noise from the engine bay, especially on cold starts, is a classic symptom of a worn or loose serpentine (accessory drive) belt, or a failing tensioner/idler pulley. It can be a common wear item on any vehicle, including your 2018 911 Carrera S, particularly as mileage approaches 30-40k miles.

Here's a breakdown:

  1. Inspection:
    • Visually inspect the belt for cracks, fraying, glazing (shiny appearance), or missing ribs. A flashlight can help.
    • Check the tensioner and idler pulleys for excessive wobble or play. Listen for grinding noises from the pulleys when the engine is off and you spin them by hand.
  2. Causes:
    • Worn Belt: Over time, the rubber hardens and loses its grip, leading to slippage and noise.
    • Failing Tensioner: The automatic tensioner can lose its spring tension, causing the belt to become loose.
    • Failing Idler Pulley/Accessory: Bearings in idler pulleys, the alternator, power steering pump, or A/C compressor can seize or become noisy.
  3. Replacement Difficulty: Replacing the serpentine belt on a 991.2 Carrera S can be moderately challenging due to engine bay access. You'll likely need to remove the rear bumper and possibly the intercooler to gain adequate access. Special tools may include a long breaker bar or a specific tensioner tool to release tension.
  4. Steps (General):
    • Disconnect the battery.
    • Gain access to the belt (often requires rear bumper removal).
    • Use a breaker bar/tensioner tool to release tension and remove the old belt.
    • Inspect all pulleys while the belt is off.
    • Install the new belt, ensuring it's correctly routed over all pulleys according to the diagram.
    • Release the tensioner and ensure the belt is snug.

When to See a Shop:

  • If you're uncomfortable with the required disassembly (e.g., bumper removal).
  • If the noise persists after replacing the belt, indicating a deeper issue like a failing accessory bearing.
  • If you don't have the necessary tools or a clear understanding of the belt routing.
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