Hissing, Clinking, Humming: Why is My AC Making that Noise?
Noisy sounds coming from your AC are unequivocally a bad sign. Popping, rattling, clanging or buzzing noises are
symptomatic of HVAC issues. These may be related to the mechanical functions of your air conditioner or associated
with other systems.
If you notice humming, bumping or any other unusual sounds, investigate as soon as possible. Any unfamiliar sound
could be a sign of a major problem. The sooner you get it checked out, the better off you’ll be. While you wait for an
HVAC tech to come out, read this to learn more about what the sounds you’re hearing may mean.
HVAC Belt Issues
If your HVAC system is emitting a high-pitched, squealing sound, it could be a belt issue. Your air conditioner uses
belts, pistons and a motor. All of these need to be working properly. Belts are usually made from coated rubber. Over
time, because they’re in perpetual motion, they can wear out.
Locate your V-belt. When your air conditioner is not running, visually inspect the rubber belts. Can you see any cracks
or tears? Have the belts slipped off their guide? These issues may require special tools to fix.
Don’t ignore high, ongoing squeals from your HVAC. If belt issues aren’t fixed, you can have everything from a motor
malfunction to a fire hazard.
HVAC Isolation Feet
A buzzing sound from your HVAC may be low-pitched and persistent. If you are hearing this, it may be that your unit
isn’t balancing properly. Small rubber feet are located at the bottom of your compressor unit. Much like any other
appliance that has motion, these rubber pieces are meant to isolate or reduce movement.
This movement isolation reduces wear and tear and protects your unit from functioning off-kilter. The buzzing noise
may be the result of unpadded movement, or the unit touching the ground. If your air conditioner is older or had some
kind of damage, these feet may be cracked and broken. If they aren’t intact, you’ll notice this sound.
It’s a small fix that saves you big money. If you don’t replace these rubber feet, your entire compressor unit will
continue to operate out of balance. This could knock all kinds of systems out of place and result in needing major
HVAC Electrical Issues
Your HVAC integrates with electricity to power the motor, fans, etc. As the air is cycled through your home, various
parts work to cool and circulate refrigerant. There are numerous functions that rely on electricity.
A clicking sound may indicate that your HVAC is having electrical issues. It may be trying and unable to start,
restarting frequently or shutting down too often. All of these are indicative of more serious issues.
Here are some electrical issues this may point to:
- Faulty or worn out wiring
- Capacitor issues
- Overloaded circuit breakers
- Loose breakers
- Undersized breakers
Keep in mind that electricity is definitely not a DIY-endeavor. HVAC technicians are certified and licensed to handle
electrical systems. Call us up if you suspect you’re having this issue.
HVAC Broken Parts
The parts that make up your HVAC system are metal, rubber and plastic. If any of these come loose or break, they
can collide with other parts. This collision can cause additional parts to break and, well, you have a snowball situation.
To avoid that, be alert to any banging or clanging noises you hear coming from the unit.
Banging could be a sign that any of these items are broken:
- Piston pins
- Connecting rods
- Fan blades
Banging could also be a larger issue with your entire compressor. Because there’s a lot at stake in terms of cost and
related damage, it’s important to get an HVAC tech out to see what’s going on.
HVAC Loose or Imbalanced Parts
Sound: buzzing, rattling, clanking
There are a variety of nuts, bolts, fasteners and connectors in your HVAC system. Your HVAC isn’t just connected to
your electrical system; there are also drain pipes, fans and mechanical processes at work. All of this could be a source
of unusual noises.
If you’re hearing rattles, clanks, buzzes and other miscellaneous sounds from your air conditioner, here are some
things it could be:
- Loose or failing fan motor
- Loose or imbalance fan blades
- A dirty air filter (which puts strain on the motor)
- Bad or imbalance blower
- Leaking refrigerant (freezing up the system)
- Outdoor copper lines are hitting something
- Internal or external debris
- Loose parts and pieces
Because this is a bit of a catch-all list, you need expert eyes on the situation. Any of these issues would require
specialized repair solutions. Depending on the age of your unit, there will be specific solutions that will work best. We
AC Repair in Highland Village
Noise is just a symptom that you have a bigger issue. Your HVAC system is valuable. If minor repairs aren’t taken
care of, they could turn into larger problems. Strittmatters has fully equipped teams and over four decades of
experience. If you’re looking for AC repair in Highland, give us a call.