Air Conditioning Sounds Your Unit Should Never Make

The enjoyable humming of an air conditioner represents warm weather and the luxury of cool air. However, unusual noises may indicate the need for air conditioning repair services. Discover some of these unusual noises.



Whistling Sounds

Whistling sounds from an AC unit can occur due to a clogged or dirty air filter. The dirty filter restricts airflow and causes air to rush through narrow openings, generating whistling noises. 

Another cause is poorly sealed vents that can create air turbulence, resulting in whistling noises.

Banging Noises

Your AC unit may produce banging noises because of loose or damaged components within the system. For instance, if the blower fan becomes unbalanced or the motor mounts are worn out, this can result in a banging sound.

Another reason could be a problem with the compressor. If the compressor valves are faulty or there is excessive refrigerant pressure, this can lead to banging noises. Additionally, debris or foreign objects inside the unit, such as twigs or leaves, can create banging sounds when the system operates.

Screeching Sounds

A cause could be a malfunctioning motor, where the bearings may be damaged or lack lubrication, resulting in friction and screeching sounds.

Gurgling or Bubbling Sounds

Gurgling or bubbling sounds happen because the drainage system may be clogged or blocked, causing water to accumulate and create the gurgling noise as it tries to flow through. Air bubbles might also form within the refrigerant lines due to low refrigerant levels, causing the bubbling sounds. 

Ticking Sounds

One possible cause of ticking sounds from the AC is a loose or damaged fan blade hitting against other components. Another reason could be debris or dirt stuck in the fan blades, causing them to rub against the housing. 

Additionally, a malfunctioning motor or bearing can generate ticking noises as they struggle to operate smoothly. The refrigerant lines or coils may also be expanding and contracting, leading to the ticking sound.

Running Water Sounds

The condensation process generates water as a byproduct, which can cause a flowing sound as it moves through the system. Moreover, a malfunctioning pump or a loose connection can lead to irregular water flow, resulting in the sound. Inadequate insulation or gaps in the ductwork might also allow water droplets to escape, leading to the perception of running water.

Rattling Vents

Rattling vents in an AC unit can occur due to disconnected ductwork. When the ducts are not securely fastened, air pressure can cause them to vibrate, resulting in rattling noises.

Clicking Sounds

The clicking sounds in an AC system can occur due to a faulty relay switch. If the relay is damaged, it may create a clicking sound when it attempts to activate or deactivate the compressor.

Buzzing Sounds

The blower motor might cause a buzzing sound due to a malfunctioning fan or motor. Additionally, loose or damaged ductwork could create vibrations that result in buzzing noises. Electrical problems, such as loose wiring or faulty capacitors, can also generate buzzing sounds.

Malone Heat and Air specializes in installing, maintaining, and repairing residential and commercial HVAC systems. Our skilled technicians and installers are available 24/7 for your heating and cooling needs. Contact us to work with factory-trained professionals.