The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

Squealing Noise from Engine Bay - 2020 Crosstrek 2.0i Premium

0

Chris P. · rep 0 · May 25, 2:17 AM · 1 replies · solved · Question

Vehicle: 2020 Subaru Crosstrek 2.0i Premium

I've got a 2020 Subaru Crosstrek 2.0i Premium with about 45,000 miles. For the past few weeks, I've been hearing a really annoying squealing noise coming from the engine bay, especially when I first start the car in the morning or after it's been sitting for a while. It's worse when it's cold or damp outside.

The noise usually goes away after a few minutes of driving, but it's getting louder and lasting longer. I'm worried it might be something serious. Is this a common issue for Crosstreks? What should I be looking for, and is this something I can inspect or fix myself, or should I take it straight to the dealership?

Any advice on diagnosing this would be great!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:17 AM

0

ClearTheCode admin answer:

A squealing noise from the engine bay, particularly on cold start or in damp conditions, is a classic symptom of a worn or loose serpentine belt (also known as the drive belt) in your 2020 Subaru Crosstrek 2.0i Premium. This belt drives several critical accessories, including the alternator, power steering pump (if applicable), AC compressor, and water pump.

Common Causes of Serpentine Belt Squeal:

  1. Worn or Cracked Belt: The rubber can harden, crack, or become glazed over time, losing its grip.
  2. Incorrect Tension: The belt may be too loose or too tight. Subaru's use an automatic tensioner, which can also fail.
  3. Contamination: Oil, coolant, or other fluids on the belt can cause it to slip and squeal.
  4. Failing Pulleys/Bearings: Worn bearings in an accessory pulley (alternator, AC compressor, idler pulley, tensioner pulley) can cause friction and noise.

DIY Inspection and Troubleshooting Steps:

  1. Visual Inspection (Engine Off!): With the engine off and cool, open the hood and visually inspect the serpentine belt. Look for cracks, fraying, glazing (a shiny appearance), or missing ribs. Also, check for any fluid leaks onto the belt.
  2. Belt Tensioner: Locate the automatic belt tensioner. It should provide constant tension. If it looks loose or is wobbling excessively, it might be failing.
  3. Pulley Spin: Carefully try to spin each accessory pulley by hand (with the belt removed if possible). Listen for grinding or rough noises, and feel for excessive play or resistance. A bad bearing will often make noise when spun.
  4. Water Test: While the engine is squealing, you can carefully spray a small amount of water onto the ribbed side of the belt (avoiding electrical components). If the squeal temporarily stops, it strongly indicates the belt is the issue.

When to See a Shop:

  • If the noise persists after belt replacement, indicating a failing accessory pulley or tensioner.
  • If you're uncomfortable with the process of removing and replacing the serpentine belt, which requires relieving tension from the tensioner.
  • If you suspect a fluid leak is contaminating the belt, as the leak itself needs to be addressed.
  • If the noise is accompanied by other symptoms like dimming lights (alternator issue) or overheating (water pump issue).
Menu

Help & account