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Why is My Radiator Fan So Loud – 5 Reasons

February 11, 2024 | Victor Lukasso

In previous articles, we’ve discussed radiator-related problems, such as fixing a constantly running radiator fan and a radiator not working when the AC is on.

However, there’s another issue that every car owner is liable to encounter: a noisy radiator fan.

A loud radiator fan often occurs due to a bent or damaged blade, a clogged radiator, a worn bearing, and a bad fan clutch.

Once your radiator fan starts making loud noise when running, it should be a cause of concern because it may tamper with how the radiator fan keeps your car’s engine at optimal temperature.


Next, we’ll explore common reasons why your radiator fan may be so loud and how to fix the issue.

Why is My Radiator So Loud?

Here are possible causes of a loud radiator fan:

  1. Bent or Damaged Blade
  2. Dirty Fan
  3. Faulty Fan Clutch
  4. Worn Bearings
  5. Cooling System Blockage
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Bent or Damaged Blade

The fan blade may bend or become damaged due to physical impact. This will cause the blade to contact its housing, producing a loud noise.

You should be able to decipher when a blade is bent or damaged by visually inspecting its positioning in the housing.

Dirty Fan

It’s normal for cooling systems to accumulate dirt and grimes after working for a few months or years. However, the grime may cause the blades to be unevenly distributed.

This imbalance often leads to excess vibrations and noise when the fan spins. You can resolve this issue by using a rag to collect all the Debris that may have accumulated on the blades.

However, if the noise persists, you may need to replace the fan blades.

Faulty Fan Clutch

The job of the fan clutch is to regulate the speed of the radiator fan by engaging and disengaging the fan based on the engine’s temperature.

However, if the fan clutch goes wrong, it may cause the fan to run continuously or at a higher speed leading to increased noise.

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In most cases, you may need to replace the fan clutch to resolve the issue.

Worn Bearings

Bearings are prone to wearing out as they ensure the fan rotates freely. When the bearing goes bad, the fan will wobble, often accompanied by a loud noise.

Cooling System Blockage

Sometimes, a noisy radiator fan can indicate an underlying issue in the cooling system.

For instance, a blockage in the coolant passages can lead to inadequate heat dissipation, causing the engine to overheat.

When this occurs, the fan kicks into high gear, operating at maximum speed to cool down the engine. This increased speed can create more noise than usual.

Additionally, you can check for electrical Faults in the system, e.g., the fan motor, fan relay, wiring, or control module.

How Do You Fix a Loud Radiator Fan?

Here are a few hands-on fixes if your radiator fan makes a loud noise.

Straighten or Replace the Blades

Depending on the status of the blade after inspection, you can straighten Bent angles with the aid of a plier.

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Meanwhile, if the damage is very severe, you may have to get the blade replaced with new ones.

Clean Radiator Fan

If you notice a large amount of dirt or grime on the blades, you can clean and wash them with a rag and check if it resolves the trouble.

Replace the Bearing

If the Bearings are worn out, you’ll need to get a replacement as soon as possible to eliminate the loud noise.

You can purchase and replace the Bearings if you have the right tools. You can contact your mechanic if you don’t know how.

Replace the Fan Clutch

If the fan clutch is faulty, it must be replaced to ensure the proper working of the cooling system.

Check for blockage in the Cooling System.

If you suspect a blockage in the cooling system, it is crucial to have it inspected and repaired promptly to avoid engine damage.

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Meet Victor Lukasso, the owner of V. Auto Basics. Through this blog, Victor Provides Insights on the latest tips, maintenance, repair, and techniques in the automotive world.