Many owners of household appliances are faced with a situation where when water gurgles in the refrigerator or a quiet murmur is heard. This sound can be barely noticeable or clearly audible at night, raising concerns about the health of expensive equipment. Often, users immediately begin to look for the repairman’s contacts, fearing that a serious failure has occurred in the refrigerant circulation system or compressor.
However, you should not rush to conclusions, much less try to disassemble the unit right away. In the vast majority of cases sound accompaniment of work is the standard mode for modern No Frost systems and even classic drip models. Understanding the physical processes occurring inside the cameras will help you distinguish normal from malfunction and save your budget on unnecessary maintenance.
In this article we will analyze in detail the physics of the processes, explain why exactly this sound is made, and highlight situations that require specialist intervention. You will learn how the placement of equipment and the condition of the pipes affect acoustic comfort, and also receive step-by-step instructions for self-diagnosis.
Physics of the process: refrigerant circulation
The main reason that the refrigerator gurgles lies in the operation refrigeration circuit. A refrigerant (freon) constantly circulates inside the system, which changes from liquid to gaseous and back. This process is necessary to remove heat from the chambers and maintain the set temperature.
When the compressor turns off, the pressure in the system equalizes and liquid refrigerant begins to flow through the evaporator tubes. It is at this moment that the characteristic sound of iridescent liquid appears, reminiscent of gurgling. This is an absolutely normal physical phenomenon that is observed in refrigerators of all brands., be it Bosch, Atlant or LG.
The intensity of the sound may vary depending on the amount of freon charged and the design of the evaporator. Some models have tubes positioned in such a way that the sound resonates, making it more audible. If gurgling occurs when the engine stops or immediately after it starts, this indicates the correct operation of the system.
Why does the sound appear and disappear?
Refrigerant circulation depends on the compressor operating cycle. When the temperature in the chamber reaches a set value, the motor stops and the refrigerant begins to actively flow by gravity, causing noise. During active operation of the compressor, freon is under pressure and moves more evenly, so the sound may be less noticeable or muffled by the hum of the motor.
Normal operation of the No Frost system
Owners of equipment with the system No Frost (without frost) often notice additional sounds that are not present in older models. Here, gurgling may be associated not only with the refrigerant, but also with the melt water removal system. In such units, moisture from the air condenses on the evaporator, freezes, and then thaws in defrosting cycles.
The resulting water flows through grooves into the drainage system. If some liquid remains in the drain tube, noise may be generated when air passes through or the body vibrates. This is especially typical for models with an upper freezer compartment, where the drainage paths are longer. flowing water. This is especially true for top freezer models where the drainage paths are longer.
Also in No Frost refrigerators, plastic cracking is often heard. This is due to temperature differences: when the defrost heater is turned on or off, the plastic parts of the housing and ducts expand or contract. Although this is not gurgling, these sounds are often mixed into a single acoustic picture that frightens the user.
- 🌡️ The sound occurs immediately after the end of the defrosting cycle.
- 💨 The noise is accompanied by a slight whistling of air in the air ducts.
- 🧊 Gurgling is heard only at the moment turning off the compressor.
The influence of the location and installation of equipment
Sometimes the reason that the refrigerator gurgles is trivial and is associated with improper installation. If the unit is not on a level surface, the liquid in the tubes or pan may splash more actively. Even a slight tilt can change the flow pattern of condensate or refrigerant, increasing the acoustic effect.
Check the installation is horizontal using a building level. Height adjustment is usually carried out by twisting or twisting front supports. It is important that the refrigerator stands stable and does not wobble when you lightly press the body. An unstable position can also lead to vibration of the internal tubes against the cabinet walls.
Another factor is proximity to heat sources or direct sunlight. If the refrigerator overheats, the compressor starts working harder and turns on more often, which increases the frequency of freon circulation cycles and, accordingly, the frequency of gurgling sounds. It is also worth checking whether the back wall is sagging, creating stress points on the copper tubes.
| Factor | Impact on sound | Elimination method |
|---|---|---|
| Uneven floor | Increased splashing liquid | Adjusting the legs |
| Touching the wall | Resonance and hum | Move 5-10 cm |
| Overheating | Frequent cycles work | Move away from the battery/sun |
| Pipe vibration | Rattling and gurgling | Bend the tubes away from the body |
When gurgling indicates a malfunction
Despite the fact that most often the sound is safe, there are situations when gurgling in the refrigerator signals problems. If other symptoms are added to the sound, they cannot be ignored. Listen carefully to the nature of the noise and check the temperature in the chambers.
One of the possible problems is lack of refrigerant (freon leak). In this case, the gurgling becomes louder, “emptier” and may be accompanied by a whistle. Since the amount of substance has decreased, it boils and flows more actively, creating abnormal noise. In this case, the cooling efficiency drops sharply.
Another reason is a clogged capillary tube or filter-drier. If the system's permeability is impaired, the compressor has to work with overload, trying to push freon. The sound in this case may change from a uniform murmur to an intermittent gurgling or bubbling sound. This is often accompanied by overheating of the compressor motor.
⚠️ Attention: If you notice that along with gurgling the refrigerator has stopped freezing, and there is no uniform heating on the rear grille (condenser) or individual warm areas have appeared, this is a sure sign of a freon leak. Operation in this mode can lead to the compressor burning out.
Diagnostics: step-by-step instructions
To understand whether your refrigerator requires repair, you need to carry out proper diagnostics. You don't need to be an engineer to perform an initial inspection. The main thing is the sequence of actions and attention to detail.
First, carry out a visual inspection and check the temperature conditions. Use a thermometer or simply assess the condition of the food. Then listen to the operation of the motor: there are no extraneous knocks, humming or too frequent starts. It is important to track at what point the gurgling appears.
☑️ Primary diagnosis of noise
If you find that the “fur coat” is frozen in the freezer, and the refrigerator compartment is warm, but there is gurgling - this may indicate that the system is working, but the cooling capacity fell. If the food is perfectly frozen, the sound is uniform and quiet, most likely the equipment is working properly.
- 🔍 Check that the tubes have not moved and are not vibrating against the housing.
- 🌡️ Make sure that the thermostat is not at the maximum value unnecessarily.
- 👂 Distinguish between the sound of a running compressor and the sound of liquid flowing after it stops.
Prevention and care of the system
To minimize extraneous noise and extend the service life of the unit, it is important to follow the operating rules. Regular defrosting (for drip systems) and cleaning the drainage hole helps to avoid blockages that can change the nature of water and air circulation.
Do not overload the shelves with products so as not to disrupt the circulation of air flow (in No Frost) and not to create unnecessary load on the structure. Also keep the rear condenser grill clean: dust impairs heat transfer, causing the compressor to work longer and harder, which increases the overall noise level.
⚠️ Attention: Never try to bend the tubes or change their position yourself unless you have the skills to work with copper. Damage to the circuit will lead to an immediate leak of freon and will require expensive factory repairs.
Frequently asked questions (FAQ)
Why does a new refrigerator gurgle louder than the old one?
Modern models often use more efficient, but less inertial refrigerants and have thinner walls of thermal insulation to increase useful volume. This may make operating sounds more audible. In addition, new compressors may have a different startup behavior.
Can an empty refrigerator gurgle?
Yes, it can. An empty refrigerator contains fewer foods that absorb sound and heat. Therefore, on/off cycles may be shorter, and the acoustic effects from the circulation of freon may be more distinct due to the absence of “sound absorbers” inside the chambers.
Does the refrigerator gurgle in vacation mode?
In the “Vacation” (or “Eco”) mode, the refrigerator operates in an economical mode, maintaining the temperature only in the freezer compartment. The gurgling noise may persist but become less frequent as the compressor is turned on less frequently. However, if it is warm in the refrigerator compartment, the sound of flow may be heard differently due to the lack of cooling in this area.
Is it dangerous if it gurgles and clicks at the same time?
Clicks are often made by the thermostat or the compressor itself when trying to start. If the clicks are frequent and the gurgling sound is accompanied by a lack of cold, this may indicate engine starting problems or a faulty start relay. In this case, it is better to call a specialist.