Why is my car’s engine squealing? Find out why

Is the squealing under your hood worth worrying about?

You’re starting your car on a cold morning and suddenly, there’s a high-pitched squealing sound coming from under the hood. Maybe it lasts for a few seconds, or maybe it persists while you’re driving or accelerating. Is this a small thing? Or should you be worried?

Unusual engine noise is a common problem, and while some problems may not require immediate attention, others may be indicative of more serious problems. Let’s analyze the possible causes of engine squealing and when to take action.

Common causes of engine squealing noises

1. The serpentine belt is worn or loose
The serpentine belt powers several important components in your car, including the alternator, power steering pump, and air conditioning compressor. Over time, this belt can become worn or loose, causing it to slip and produce squealing sounds.

• Why it’s important: A loose or worn belt can eventually snap, leaving you without access to essential systems like power steering or even battery charging.
• what to do: A quick inspection can reveal if the belt needs adjustment or replacement.

2. Belt tensioner failure
Belt tensioners ensure that the serpentine belt maintains the correct tension. If the tensioner fails, it can cause the belt to slip, causing a noticeable squealing sound.

• Why it’s important: A faulty tensioner can prematurely wear the belt and possibly cause other system failures.
• what to do: Replacing the tensioner is a simple fix that can prevent more costly repairs down the road.

3. Worn alternator bearings
Your alternator contains internal bearings that wear out over time. If these bearings fail, you may hear squealing or grinding sounds coming from the engine bay.

• Why it’s important: A failed alternator can cause the battery to drain, preventing the car from starting.
• what to do: If there is a problem with the alternator bearings, the alternator may need repair or replacement.

4. Power steering problem
If you experience squealing when turning, it may be related to your power steering system. Insufficient power steering fluid or a faulty pump can cause this noise.

• Why it’s important: Ignoring power steering problems can result in difficult steering, creating a major safety hazard.
• what to do: Check the fluid level and inspect the pump for wear.

5. Moisture on the belt
On humid mornings or rainy days, moisture may cause the belt to squeal temporarily. Once the water evaporates, the noise usually disappears.

• Why it’s important: This is usually harmless, but if the screaming persists, it’s worth investigating.
• what to do: Monitor recurring issues and resolve root causes when necessary.