Are you hearing a loud clanking, rattling or buzzing noise from your AC compressor? A noisy compressor can not only be annoying but can also indicate underlying issues that need your attention. In this article, we will explore the top five reasons for a noisy aircon compressor and provide solutions to help you enjoy a quieter and more efficient cooling experience.

1. Malfunctioning Compressor Motor

A malfunctioning compressor fan motor is the number one reason for your compressor to be noisy. The compressor motor is a vital component of your air conditioning system. When it starts to malfunction or fail, it can generate various noises, such as clicking, banging, or even high-pitched screeches. Common causes of a malfunctioning compressor motor include wear and tear over time, electrical issues, or overheating due to a lack of maintenance.


To address a malfunctioning compressor motor, it’s essential to consult a professional HVAC technician. They will assess the situation and may recommend one of the following solutions:

  • Motor Repair: In some cases, the motor might be repairable by replacing specific components. Repair costs can vary but typically range from $200 to $600, including labor.
  • Motor Replacement: If the motor is severely damaged, it might need to be replaced. The cost of a compressor motor replacement ranges from $500 to $1,500, including parts and labor.

2. Bent Or Misaligned Compressor Fan Blades

The compressor fan blades play a crucial role in air circulation within the unit. When they become bent or misaligned, they can generate various noises, such as rattling, clicking, or scraping. This issue can occur due to accidental impacts, debris getting caught in the fan, or natural wear and tear.

Compressor fan blade
Compressor fan blade


Resolving bent or misaligned fan blades usually involves one of the following:

  • Blade Straightening: In many cases, a technician can straighten the blades, which is a cost-effective solution. Blade straightening typically costs around $100 to $200, including labor.
  • Blade Replacement: If the fan blades are severely damaged, they may need to be replaced. The cost for new blades can range from $150 to $300, including parts and labor.

3. Overused Compressor

An overused compressor can put excessive stress on various components within the unit, causing screws, bolts, or other parts to become loose or damaged. This can result in noises like rattling or clanking. Overuse is often a result of not following a proper maintenance schedule, including neglecting cleaning and servicing.

Technician repairing aircon compressor
Technician repairing aircon compressor


Fixing this issue typically involves:

  • Tightening Loose Components: A technician can tighten any loose screws, bolts, or components. This part of the repair may cost around $100 to $200, including labor.
  • Component Replacement: If parts are severely damaged, they should be replaced. The cost for this type of repair can vary significantly, depending on the extent of the damage and the specific components that need replacement. It may range from $150 to $500 or more.
In all cases, it’s crucial to consult a professional HVAC technician to accurately diagnose and resolve these issues. Attempting DIY repairs can lead to further damage and may void your warranty. Professional technicians have the expertise and experience to ensure the safe and effective repair of your aircon compressor. The estimated costs provided are approximate and may vary depending on your specific situation and location.