What to Do When Your AC Makes A Pulsating Noise- 7 Essential Tips

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Pulsating sounds coming from your AC unit should never be ignored; even though it might just require simple repairs, such as new filters being installed, they could indicate more serious issues.

ACs that make pulsating noises are usually due to minor problems that are easily fixable. If you can’t find the solution to your problem in today’s article, you can visit this site to contact a team of reputable HVAC contractors that service Siloam Springs, AR, and the surrounding areas.

Pulsating noise is definitely something that an air conditioning unit should not be making. Here are a few important things you should check when your AC starts making this type of sound:

1. Check the Electrical Connections

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Sounds of rhythmic vibration within an AC can often indicate electrical parts are vibrating and could potentially cause some damage if left unchecked, so it’s crucial that this issue be addressed as quickly as possible.

Rattling noises coming from your AC unit could be a telltale sign that loose screws or bolts have come loose, causing parts to rattle against each other and create serious issues if this sound persists – so it is wise to get an expert’s assessment.

Clicking noises may indicate that the fan blades are misaligned and require repair or replacement, preventing more expensive problems later. To help further ensure the longevity of your AC system, having it professionally maintained every year could prevent additional issues in future years.

2. Check the Refrigerant Levels

Air conditioners generate noise when running, including clanking, chattering and rattling noises that may or may not seem alarming; however, when it comes to pulsed noises from your AC unit it should never be overlooked as this may indicate malfunction.

Pulsating noise could indicate that your refrigerant line is colliding with a wall. To minimize contact between it and the wall, place foam or rubber insulation between it and its path so as to keep inches between you.

Pulsating noises could indicate issues with your compressor or loose parts in your unit, so identifying and fixing this type of issue early will help prevent more serious complications in the future.

3. Check the Compressor

Many AC models feature motors to power both fan and compressor functions. When these motors become damaged, they may make strange rattling noises; an HVAC specialist should immediately address any such abnormalities to avoid further damage.

If the noises are intermittent, this could indicate a problem with internal pressure and should prompt you to turn off the air conditioner immediately and contact a professional for advice.

Clicking noises when your air conditioning unit is running is a telltale sign of loose parts; until these components have been repaired or replaced with new ones, this clanking sound will persist until repaired or replaced with new parts. Pulsating sounds could also indicate the compressor needs service or repair.

4. Check the Fan

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AC fans can produce some strange noises if they become loose or require maintenance, especially older units. Rattling noises could indicate debris lodged inside your unit that needs immediate attention; for example, sticks or leaves may be stuck there and should be addressed as soon as possible.

Buzzing or humming noises could also indicate something is amiss with your AC system, potentially signaling loose refrigerant lines or electrical issues which need immediate professional inspection.

Pulsating noises should never be considered normal, and as soon as they’re noticed it’s wise to contact a professional as soon as possible in order to have it checked out and resolved before becoming more significant. Doing this allows you to address the issue early before it escalates further down the road.

5. Inspect the Air Filters

Regularly inspecting and maintaining the air filters in your HVAC system is essential for optimal performance. Over time, air filters can accumulate dust, dirt, and other particles, obstructing proper airflow and reducing the system’s efficiency.

By inspecting the air filters, you can identify any clogs or excessive debris buildup and take appropriate action, such as cleaning or replacing the filters. This not only ensures better indoor air quality by trapping pollutants but also prevents strain on the HVAC system, allowing it to operate efficiently and prolonging its lifespan.

6. Assess the Thermostat

The thermostat serves as the control center for your HVAC system, regulating the temperature and ensuring comfort in your home or building. It is important to assess the thermostat periodically to ensure it is functioning accurately and efficiently. Check for any signs of damage, such as a malfunctioning display or unresponsiveness to adjustments.

Verify that the temperature readings are consistent with the actual room temperature. Consider upgrading to a programmable or smart thermostat, which offers advanced features and allows you to optimize energy usage and customize temperature settings based on your schedule and preferences.

7. Contact an HVAC Expert

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When your air conditioning produces a rhythmic pulsating noise, it typically indicates there is something amiss inside its system. This may be caused by refrigerant leakage, an electrical glitch, or fan blades that have become imbalanced, or the contractor relay used to start your outdoor unit is malfunctioning.

The good news is that these sounds usually indicate loose or broken parts that can easily be fixed; however, waiting too long could result in more serious problems in the future. When hearing any unusual noise coming from your air conditioning, contact an HVAC expert immediately as soon as you notice such noises.


Pulsating noises coming from your AC can be a sign of something serious, so it’s best to investigate the cause as soon as you hear them. With some simple troubleshooting and repairs, you may be able to fix the issue yourself in no time.

However, if the problem persists or is more complex than expected, you should contact an experienced technician for professional help. Regardless of how bad the pulsating sound is coming from your system, addressing it promptly can save you time and money down the line and preserve both energy efficiency and indoor air quality in your home.