An AC making strange noise is telling you which part is failing. Whistling points to refrigerant, banging to loose hardware, squealing to a belt or bearing. In Goodlettsville, where summer temperatures routinely shoot to well over 90 degrees, your air conditioner gets daily use and a noisy unit rarely quiets down on its own.
Parthenon has served Middle Tennessee since 2008, backed by more than 150 years of combined team experience. Below, learn why your air conditioner is making a racket, then call us for AC repair in Goodlettsville, TN.
Key Points
- Clicking at startup and shutdown is normal, rapid repetitive clicking is electrical
- Whistling or hissing usually means a refrigerant leak, a leaking valve, or a duct joint
- Banging or clanking means loose parts, so shut the unit off immediately
- Buzzing indoors usually means a frozen evaporator coil from a dirty filter or low refrigerant
- Popping is almost always ductwork, which costs efficiency rather than damaging the AC
What Is Causing Your Noisy Air Conditioner?
Before troubleshooting, know that some air conditioner noises are normal. Clicking during startup or shutdown is often normal, and your air conditioner also clicks at the end of a cooling cycle. If the clicks are repetitive or rapid, though, that points to an electrical issue needing professional attention.
If the noises are loud and persistent, you likely have a problem that requires expert repair. Here are five reasons your AC is making strange noises.
1. Whistling or Hissing Noises
Does your air conditioner sound like a whistling teakettle? The unit might have a refrigerant leak.
Refrigerant is a compound that absorbs heat from your indoor air, cools it down, and ferries it outside. A high-pitched whistling or hissing noise might indicate a refrigerant leak, a leaking valve, or even escaping air from duct joints. You will need an HVAC technician to pinpoint the source.
2. Banging or Clanking Sounds
If you hear loud banging or clanking from the air conditioner, shut the unit off right away. These noises indicate loose or broken parts inside the system, such as the fan blades or compressor piston. The noise happens when loose parts strike other components inside the unit.
Stop using the air conditioner and call us. If you let it keep running, you can do serious damage to the system.
3. Squealing Noises
Is your air conditioner making a strange noise that sounds like squealing or whining? Best case, you have a loose belt or fan motor problems. The fan motor’s bearings may need more lubrication. Issues like these often require only minor repair work.
Worst case, there is a pressure problem inside the compressor. The unit might shut down to prevent further damage. If it does not, turn it off yourself and call us. When the cause is not obvious, HVAC system diagnostics finds it rather than guessing.
4. Buzzing Sounds
Buzzing can come from both your indoor and outdoor units. Indoors, a frozen evaporator coil is the most likely cause. Evaporator coils freeze because of a refrigerant leak or a dirty air filter.
Try replacing the filter and thawing the coils by letting the unit rest for a few hours. Then run the system and see if the noise stopped. If it keeps buzzing, you will need professional AC repair.
If the buzzing comes from the outdoor unit, there may be electrical malfunctions in the compressor or fan motor. The rubber feet beneath the unit may also have worn down, which makes the unit buzz when it runs.
5. Popping Noises
Do you hear a weird popping noise somewhere in your Goodlettsville home? If you are not making popcorn, the noise is probably your ductwork. Loose and cracked ductwork lets air escape, which creates the racket you are hearing.
Faulty ductwork will not harm your air conditioner, but it does cut the unit’s efficiency, so it works harder to cool the house. Ignore it and your cooling bills climb. Better to have the ductwork fixed sooner than later.
Frequently Asked Questions
Is it safe to keep running my AC if it is making noise?
It depends on the noise. Clicking at startup and shutdown is normal and safe. Banging or clanking is not, and you should shut the unit off immediately, because loose parts striking other components cause serious damage the longer it runs. Squealing from a compressor pressure problem also means shut it down.
Why does my AC buzz but still blow air?
Indoor buzzing usually points to a frozen evaporator coil, caused by either a dirty air filter or a refrigerant leak. Replace the filter and let the unit rest a few hours so the coils thaw, then run it again. If the buzzing continues, the cause is refrigerant or electrical and needs a technician.
Does popping mean my air conditioner is broken?
No. Popping almost always comes from ductwork rather than the AC unit itself. Loose or cracked ducts let conditioned air escape, which makes noise and drives up cooling bills. The unit is fine, but the system is wasting energy until the ducts get sealed.
Can maintenance prevent AC noises?
Regular maintenance catches most of the causes early. A technician cleans the coils, checks refrigerant, inspects the fan motor and bearings, and replaces the filter, which addresses the frozen-coil and squealing causes before they make noise. Routine AC maintenance is the cheapest way to keep the system quiet.
Why Is Your AC Making Strange Noise in Goodlettsville?
If your AC is making a strange noise, it is never a good sign. Calling our experts at Parthenon Plumbing, Heating, & AC Repair is the way to know what is actually happening with your system. If we find a problem, you can count on us to fix it.
Want your air conditioner quiet and working all summer? Request a free estimate and a technician will identify the noise, tell you which part is causing it, and quote the repair before starting any work.
