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Why Is My AC Making a Squealing Noise?

Updated: Jun 26

Is your air conditioner making a high-pitched squealing noise that's disrupting your peace and making you worried about the system's health? Don't panic just yet. While an unusual sound can be alarming, it doesn't necessarily mean a major breakdown is imminent. Let’s delve into the common reasons behind the squealing noise in your AC unit and provide you with some practical troubleshooting steps to identify and address the issue.

Amana AC units
Commercial or Residential AC unit maintenance plans

Why is my AC squealing?

Belt problems. One of the most common causes of squealing noises in an air conditioning system is a faulty or worn-out belt. Over time, the belt that connects the motor and the fan in your AC unit can become loose, frayed, or damaged, which can result in a high-pitched sound that’s pretty irritating. If the belt is the culprit, it's crucial to replace it promptly to avoid more extensive damage to the system. Call your HVAC technician to ensure proper belt installation and tension.

Needs lubricant. The moving components of an air conditioning system, such as the fan motor and blower, require proper lubrication to operate smoothly. When these parts are not adequately lubricated, they can produce a squealing noise. This issue can typically be resolved by adding lubricant to the appropriate components, but it's important to hire a professional HVAC technician to perform this task, as they have the expertise and knowledge to ensure the correct lubrication is applied.

Malfunctioning fan motor. A malfunctioning fan motor can also be the source of the squealing noise in your AC unit. Over time, the motor bearings can wear out, causing friction and resulting in a high-pitched sound. If the fan motor is the culprit, it's crucial to have it repaired or replaced promptly to prevent further damage to the system. A trained HVAC technician can diagnose the issue and recommend the most appropriate course of action.

Dirty or clogged air filters. Sometimes, the solution to a squealing noise in your AC system can be as simple as replacing a dirty or clogged air filter. When the air filter becomes excessively dirty, it restricts the airflow, causing strain on the fan motor and resulting in unusual noises. Regularly inspect and replace your air filters to ensure proper system functioning and reduce the chances of encountering such problems.

Refrigerant leaks. Refrigerant leaks are another potential cause of a squealing noise in your AC unit. When the refrigerant level is low due to leaks, the compressor has to work harder to cool your home, leading to increased friction and a high-pitched sound. If you suspect a refrigerant leak, it's essential to contact an HVAC professional to identify and fix the leak, as well as recharge the refrigerant to its optimal level.

The bottom line

While a squealing noise in your AC unit can be unsettling, it's important not to panic. By understanding the potential causes behind this issue, you can take the necessary steps to troubleshoot and resolve it promptly. Remember to consult a qualified HVAC technician for a proper diagnosis and expert repair. Regular maintenance, such as replacing air filters and scheduling annual inspections, can also help prevent future issues and keep your air conditioning system running smoothly and silently for years to come.

Call us

Have questions about air conditioning? Experiencing any issues with your air conditioner? Please do not hesitate to call us here at Tri-Point Refrigeration. We are committed to providing our clients with the utmost quality of service while giving your AC the TLC it deserves.

We’re excited to help you along the way, and with regular servicing, we can keep your equipment running smoothly and healthily, while also extending the reach of your dollar.

For a direct line to any of our employees ready on the line to help you, please call…(512) 651-4565 for our Austin, Texas community (806) 686-0050 for our Lubbock, Texas community. Or check out our website at



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