The situation when the refrigerator gurgles immediately after you slam the door is familiar to many owners of household appliances. This particular sound often causes concern, leading to thoughts of a serious breakdown or refrigerant leak. However, in most cases, such acoustic manifestations are an absolutely normal physical process associated with the circulation of freon in the system.
Sound effects can vary from a quiet pouring of water to a loud rumbling that can be heard even in the next room. Understanding the principles of operation of the compressor and evaporator will help you distinguish the normal operation of the equipment from real malfunctions that require the intervention of a specialist.
In this article we will analyze in detail the mechanics of the occurrence of sounds, consider the influence of the model design and temperature conditions on the noise level. You will know when to worry and when you can calmly ignore the “talkativeness” of your unit.
Physics of the process: refrigerant circulation
The main reason why refrigerator makes the sounds of shimmering liquid is the movement of the working substance - freon. After closing the door, the internal temperature of the chamber begins to rise, and the thermostat commands the compressor to start or the refrigeration cycle to continue. At this moment, liquid refrigerant under high pressure begins to actively move through the thin tubes of the system.
When you hear how water gurgles inside the case, you actually hear freon boiling in the evaporator. The transition of a substance from a liquid to a gaseous state is accompanied by characteristic hissing and bubbling. This is especially evident in models with a system No Frostwhere the refrigerant passes through long and complex circuits.
The intensity of the sound directly depends on the amount of freon that has entered the evaporator and the speed of its movement. If a lot of fluid circulates in the system, the sound will be louder and longer lasting. This is a normal phenomenon, indicating that cooling cycle is started and working correctly.
It is worth noting that modern refrigerants can be noisier compared to the freon used in old Soviet models. New environmentally friendly compounds have different physical properties, which affects the acoustics of the entire system.
The influence of the No Frost and defrosting system
Owners of equipment with an automatic defrosting system often notice that the refrigerator gurgles it is after closing the door, if before that it was open for a long time. This is due to the fact that warm, humid air has entered the chamber, which requires intensive cooling and removal of moisture.
The system No Frost assumes constant air circulation inside the chambers. Fans drive air masses through the evaporator, where they are cooled. Sounds reminiscent of flowing water or wind can be caused by the operation of these particular fans and the movement of condensate in the drainage system.
- 💧 Condensation flows into the pan, making dripping or overflowing sounds.
- 🌬️ Fans create a flow of air that can resonate with the internal walls.
- ❄️ The ice on the evaporator melts during defrost cycles, the water drains and makes noise.
- 🔧 The expansion and contraction of plastic parts also adds its own sounds.
Particular attention should be paid to the drainage system. If water drainage tube is clogged or improperly positioned, water may pool and gurgle as air passes through. In systems with automatic defrosting, water regularly flows into a tray above the compressor, where it evaporates, which is often accompanied by a characteristic hissing.
Why is No Frost noisier?
In refrigerators with the No Frost system there are more moving parts (fans, heaters defrost) than in drip models, so the overall noise level may be higher.
Thermal expansion of housing materials
Another common cause of extraneous sounds is the physical change in the dimensions of materials under the influence of temperatures. When you close the door, an active cooling process starts inside the chamber, and the temperature of the internal walls, shelves and drawers drops sharply.
The plastic from which the internal panels and drawers are made has a high coefficient of thermal expansion. When rapidly cooled, the material contracts, producing characteristic clicks, crackles and sometimes sounds similar to gurgling or crackling. This is especially noticeable in new refrigerators or after prolonged defrosting.
Metal elements of the internal lining also react to temperature changes. If metal comes into contact with plastic or other metal at a point of stress, the compression may produce a creaking or short sound echo, which the user mistakenly interprets as the operation of the compressor.
⚠️ Attention: If cracking and clicking sounds become very loud or are accompanied by visible cracks in the plastic, this may indicate defective materials or poor assembly technology.
Often such sounds disappear after several weeks of use, when the materials “get used” to constant heating and cooling cycles. However, in older models, the plastic can become more fragile and noisy over time.
Improper installation and position of the case
Often the reason that refrigerator makes strange sounds lies not in its internals, but in the way it is installed. Incorrect positioning of the housing can lead to vibrations that increase the natural operating noise of the compressor and freon circulation.
If the unit is not level, the oil in the compressor may be distributed unevenly, which leads to noisier operation of the mechanism. In addition, misalignment can cause tubes to vibrate against the walls of the case or against each other, creating rattling and gurgling sounds.
☑️ Diagnostics of refrigerator installation
The gap between the back wall of the refrigerator and the wall of the room also plays an important role. If the equipment is standing closely, heat exchange is disrupted, the compressor works with increased load, producing louder sounds. In addition, vibration can be transmitted to the wall, creating resonance.
| Installation parameter | Normal | Possible problem |
|---|---|---|
| Gap at the wall | Minimum 5-10 cm | Overheating, compressor noise |
| Level position | Strictly horizontal | Vibration, oil noise |
| Supports | All 4 legs on the floor | Rattling of the body |
| Distance to furniture | At least 5 cm on the sides | Echo, increased noise |
To eliminate the problem, you need to set the adjusting feet correctly. The front legs are often made slightly higher than the back legs so that the door closes itself under the influence of gravity. However, the distortion should not be excessive.
When gurgling is a sign of malfunction
Despite the fact that most sounds are normal, there are situations when gurgling indicates serious problems. If the sound is accompanied by a lack of cold, a constant hum of the compressor, or the appearance of ice in unexpected places, this is a cause for alarm.
One of the possible reasons is a freon leak. If there is insufficient refrigerant in the system, turbulence and noise may occur that differs from the normal operating hum. Cavitation may also be observed in the compressor if the oil is mixed with gas in incorrect proportions.
- 🔊 The sound has become much louder and sharper than before.
- 🌡️ The temperature in the chambers no longer corresponds to the set values.
- 💦 The appearance of puddles of water around the refrigerator or inside the chambers.
- ⏱️ The compressor runs non-stop or turns on too often.
Another problem is a clogged capillary tube. In this case, freon cannot circulate normally, creating excess pressure and characteristic sounds in front of the blockage. This requires the intervention of a technician with specialized equipment.
⚠️ Attention: Self-repair of the cooling system is prohibited and life-threatening. Freon is under high pressure, and its leak can lead to ignition (in the case of some types of refrigerants).
Comparison of noise levels of different types of refrigerators
The level of acoustic comfort depends on the type of compressor and the overall design of the refrigerator. Inverter models, as a rule, operate quieter, since they do not have sudden starts and stops of the engine, but smoothly regulate power.
Linear compressors, often found in technology LG or Samsung, can produce specific clicks when turning on and off, which are sometimes confused with malfunction. Conventional compressors are noisier due to the mechanical nature of their operation.
The volume of the chamber also matters: in larger refrigerators, the refrigerant circulates through longer tubes, which can increase the duration of the pouring sounds. Multi-chamber models are more difficult to set up and may have more points of noise occurrence.
When choosing new equipment, pay attention to the declared noise level in decibels. Models with levels up to 39 dB are considered very quiet, while values above 44 dB can be noticeable in a small kitchen-living room.
Noise reduction methods and prevention
If your refrigerator works properly, but the sounds cause discomfort, you can take a number of measures to reduce the noise level. First of all, check whether the pipes on the back wall of the cabinet are touching other objects or walls.
Sometimes it helps to install the refrigerator on a soft, vibration-absorbing surface if the floor is hard and level. It is also worth checking the tightness of all internal shelves and drawers - any loose element can resonate.
Regular defrosting and cleaning the drainage hole will help avoid the accumulation of excess moisture and ice, which often become sources of gurgling sounds. Make sure that products do not block the ventilation holes inside the chambers.
Sequence of actions in case of noise:1. Move the refrigerator away from the wall.
2. Check the level with your feet.
3. Remove foreign objects from behind.
4. Listen to the nature of the sound.
If after all the checks the sound remains suspicious, it is better to call a specialist for diagnosis. A professional will be able to use a pressure gauge and leak detector to determine the condition of the refrigerant system.
Frequently asked questions (FAQ)
Is it normal for the refrigerator to gurgle immediately after turning on?
Yes, this is absolutely normal. At the moment the compressor starts, active circulation of the refrigerant begins, which is accompanied by the sounds of liquid pouring. This indicates the health of the cooling system.
Why did the old refrigerator begin to gurgle louder?
Over time, the oil in the compressor may wear out or play may appear in the mechanism, which increases the noise. The rubber shock absorbers could also have dried out, and the vibration is transmitted to the body more strongly.
Can an empty refrigerator gurgle?
Yes, it can. The absence of products even enhances the effect, since empty shelves and walls absorb sound waves worse, and the echo inside the chamber becomes louder.
Is it dangerous if gurgling is accompanied by a whistle?
A whistle may indicate a freon leak through a microcrack or a loose connection. In this case, you need to disconnect the device from the network and contact a service center.
Does the temperature in the room affect the sound of operation?
Yes, in a hot room the compressor works harder and longer to maintain the set temperature. This leads to more frequent circulation of the refrigerant and, accordingly, more frequent sounds.