9 Sounds You Don't Want To Hear From Your AC System

air conditioning noises

Your air conditioner is not a silent appliance. It’s normal for your AC to make some noise, but some sounds could mean trouble for your cooling system in Texas. Here are nine common AC noises and what they mean:

  1. Buzzing or vibrating noise – This could indicate that something is loose or needs to be tightened, such as a fan blade or motor mount. It could also be a sign of a failing compressor or refrigerant leak.
  1. Clicking noise – A clicking noise could be caused by a defective relay, thermostat, or control board. It could also be a sign of a failing capacitor or motor.
  1. Rattling noise – A rattling noise could indicate something loose or out of balance, such as a fan blade, motor mount, or compressor. A loose or damaged duct could also cause it.
  1. Hissing noise – A hissing noise could be a sign of a refrigerant leak, which could be dangerous and should be addressed immediately. A clogged filter or dirty evaporator coil could also cause it.
  1. Whistling noise – A whistling noise could be caused by a dirty filter or a leak in the ductwork, which could reduce the airflow.
  1. Squealing noise – A failing fan motor or belt could cause a squealing noise. It could also indicate a worn-out bearing or a failing compressor.
  1. Thwapping – If you hear a “thwapping” sound, similar to playing cards on bicycle spokes, something may be stuck in the blower blades or touching the blower from inside the unit.
  1. Banging – When there’s a loud banging as your unit runs, it’s broken and needs repair. For example, you may have a damaged piston pin or connecting rod. Banging can also mean you need a compressor replacement. You should stop using the unit until it is repaired or replaced.
  1. Grinding – A grinding sound from your AC usually indicates an issue with vital AC parts.
  • Damaged blower fan bearing or blade
  • Damaged AC compressor valve
  • Damaged condenser fan bearings

Hearing any of these noises could indicate that your AC needs attention from the professionals at ABA Austin. Not sure if your cooling system needs to be repaired? Check out our article on Broken AC Warning Signs. Our team at ABA Austin provides heating and cooling system repairs and replacements for homeowners in Austin and the surrounding areas. Don’t hesitate to call our team to schedule an appointment!