Why Does My Window AC Sound Like Water Running? [FIXED] -

Why Does My Window AC Sound Like Water Running? | The sound of running water may be one of the most well-known sounds created by a window temperature control system.

When the air conditioning unit begins generating this commotion, it’s likely to make you very angry and irritated. Homeowners often wonder what could be causing it and how to fix the issue.

There are several potential reasons why a window AC may sound like water is running inside it.

In this article, we will explore the most common causes of this noise and provide solutions. We will likewise resolve a few, much of the time-posed inquiries about window unit sounds. By understanding what may be behind the water running noise, you can determine the best way to resolve the problem.

Common Reasons of water running sound in your window AC is: 

1. Water dripping from the evaporator coil
2. Water melting down evaporator coil during defrost cycle
3. Water leaking from the drain pan
4. Object obstructing the blower fan 
5. Broken or worn components

Contents

1 Why Does My Window AC Sound Like Water Running? [Cause & Easy Solutions]
2 Water dripping from the evaporator coil:
3 Water melting down evaporator coil during defrost cycle:
4 Water leaking from the drain pan:
5 Object obstructing the blower fan:
6 Broken or worn components:
7 Conclusion:
8 FAQs:

Why Does My Window AC Sound Like Water Running? [Cause & Easy Solutions]

We will Guide the most common causes of this noise and provide Worked solutions.

Water dripping from the evaporator coil:

As the forced air system attempts to cool and dehumidify the air in a room, dampness is gathered on the evaporator loop inside the unit. This curl attempts to coax heat out of approaching air, making water fumes gather.

The condensed water collects in a drain pan located below the coil. Gravity then causes the water to drip from the coil into the pan.

On high-humidity days, a large amount of water can accumulate, requiring frequent dripping. This dripping sound is often what homeowners describe as sounding like water running.

To address excessive dripping,

the first step is to check indoor humidity levels.
Run a dehumidifier to lower the moisture content in the air, which will reduce the load on the AC.
Cleaning dust from the outdoor coil unit can also help the system run more efficiently, lowering moisture removal needs.
If dripping persists, inspect the drain line from the pan to ensure it is clear and water flows out properly.
Occasionally, the line can become blocked, requiring cleaning out.

Water melting down evaporator coil during defrost cycle:

Another common cause of the water running sound occurs during the air conditioner’s defrost cycle.

On very low temperatures or high humidity days, moisture in the air can cause the evaporator coil to freeze up inside the unit, blocking airflow.

The AC unit has protective thermostats that sense this and initiate a defrost cycle where the coil is briefly heated up, melting any accumulated ice. The melting ice then drips down, sounding similar to running water.

This is a normal part of the AC’s operation, so no repairs are needed. However,

you can take steps to minimize coil freeze-up.
Ensure proper air filter replacement to maintain good airflow.
Keep indoor humidity levels moderate.
Only run the AC when truly needed rather than constantly.

These tips can reduce defrost cycles, cutting down on the dripping noise.

Water leaking from the drain pan:

If water is collecting in the drain pan but not properly draining out via the hose, it can overflow and leak, potentially causing a water running sound.

Cracks, holes, or improper seals in the plastic drain pan are common causes of leaks. Inspect the pan for any damage, looking for signs of water stains around it.

Gently loosen mounting screws if needed and check for cracks before retightening.

Replacing a cracked or damaged drain pan is usually the solution when leaks occur.
Contact the AC manufacturer, as replacement parts may be needed depending on the model and age.
A qualified technician can install a new pan if patching is not possible.
Keeping debris clear of the drain line will also prevent backups from overfilling the pan.

Object obstructing the blower fan:

Window AC units contain an internal blower fan that draws air through the evaporator coil and then blows it out into the room.

If a small foreign object, such as paper, becomes lodged near or around the rapidly spinning fan blades, it can vibrate vigorously, making a noise resembling flowing water.

Insect carcasses trapped inside unit components are another common cause.

Gaining access to inspect and carefully remove any obstructions requires dismantling portions of the AC casing.
This task requires care and technical skills best left to professionals if you are highly experienced in appliance repair.
Request assistance from an HVAC technician rather than risk damaging internal parts yourself.

Broken or worn components:

On older window units, normal wear and tear can cause internal components to degrade, leading to abnormal noises.

Moving parts like bearings within the blower fan motor may fail, producing a rhythmic tapping or clunking.

Damaged fan blades striking the housing with each rotation create a knocking-type sound. Cracked or loose plastic parts can also vibrate audibly.

For issues stemming from worn or broken internal components, replacement by a technician is usually necessary.
Assess the age and condition of the unit – extremely old models may need to be economically repairable.
Consider replacing rather than investing heavily in repairs for window ACs nearing the end of their usable lifespan.
Reputable brands often last 10-15 years with proper care and maintenance.

Conclusion:

By understanding the five most common causes of the water running noise in window ACs, homeowners can pinpoint likely issues and take corrective action.

From simple solutions like ensuring good airflow to more involved repairs, addressing the root problem eliminates an annoying symptom.

With proper maintenance, window units can operate smoothly and quietly through many seasons of use.

For incurable mechanical faults, timely replacement provides a refreshed cooling system. While some degree of operational sound exists, troublesome water running should not persist in a well-functioning AC.

FAQs:

No, the dripping or melting ice sounds by themselves do not damage the AC. They signify normal condensate removal processes. However, excessive dripping may point to deeper issues like leaks or drainage clogs requiring repair to avoid potential water damage over time.

Most AC units are designed to run 8-10 hours per day for optimal dehumidifying and temperature control. Shorter cycles are preferable to extended constant run times to avoid unnecessary strain and noise production. Thermostat timers automate recommended daily usage.

No, dust itself does not directly produce the water running sound. However, accumulated dust can block indoor/outdoor coil airflow over time, triggering premature evaporator coil freeze-ups. The resulting melting ice drips cause the noise. Regular filter replacement every 30 days prevents this indirect cause.

Yes, the water running sound and other brief intermittent noises may occur more often during extreme heat or humidity spikes. The unit must work extra hard to keep internal components cool and remove excess moisture from circulated indoor air. Monitor for concerning continuous sounds, but brief intermittent symptoms in severe conditions are considered typical operations.

Loud knocking, grinding, screeching, or other irregular sustained noises usually signal problems beyond normal wear, like failed bearings, cracked parts, or refrigerant loss. Intermittent sounds are less urgent, but continuous abnormal noises for over 24 hours require a service professional to evaluate the AC and identify any issues needing prompt attention.