The situation when a refrigerator makes sounds reminiscent of the howling of a blizzard is familiar to many owners of household appliances. This low-frequency hum or piercing whistle not only irritates the ear, but also signals that processes are occurring inside the unit that go beyond the norm. Unlike the usual rumbling of a running motor, a “blizzard” in the refrigerator is a sign of an anomaly in the refrigerant circulation system or the mechanical part of the compressor.
Ignoring such sound signals is dangerous, since they often precede more serious breakdowns, including engine failure or depressurization of the circuit. Understanding the nature of sound is the first step to saving your equipment. In this article, we will analyze in detail why the equipment begins to “sing,” which components require immediate attention, and whether it is possible to fix the problem yourself without resorting to expensive service.
The nature of acoustic anomalies in refrigeration systems
To understand why the refrigerator is humming with such intensity, it is necessary to consider the physics of the process. Normal operation of the unit is accompanied by background noise that occurs when freon is compressed and the pistons move. However, a sound reminiscent of the howling of the wind is usually associated with the passage of a gas-air mixture under high pressure through narrow holes or with the vibration of metal tubes.
Often the source of the howling becomes compressor, especially if it is of a linear type or has an exhausted resource. As the internal parts of the engine wear out, the clearances increase and the flow of coolant begins to create turbulent turbulence, which we hear as a whine. It is also worth considering that modern inverter models can produce specific sounds when switching to high speeds.
It is important to distinguish the nature of the sound: if it is monotonous and increases with cooling, the problem is most likely in the circulation system. If the sound is intermittent and accompanied by knocking, this may indicate mechanical damage. Diagnostics It should begin with determining the type of sound and the conditions for its occurrence.
⚠️ Attention: If the howling is accompanied by a burning smell or visible smoke, immediately disconnect the device from electrical networks. Continuing operation in this mode may lead to a fire in the wiring or motor windings.
It is worth remembering that the acoustic properties of the housing also play a role. An empty refrigerator can resonate more strongly than a fully loaded refrigerator, amplifying any extraneous noise. Therefore, before you panic, check whether the load on the shelves has changed and whether the unit is standing on an uneven surface.
Compressor diagnostics: the heart of the system is noisy
The compressor is the main source of noise in any refrigerator. If your the refrigerator howls, first of all you should listen to the rear lower part of the case, where the motor is located. The hum can be caused by several factors related to the operation of this unit.
One of the common reasons is a malfunction compressor suspension. The engine is mounted on springs or rubber shock absorbers that dampen vibration. Over time, the metal of the springs can get tired, and the rubber can dry out and crack. As a result, the motor housing begins to touch the metal tubes or cabinet walls, transmitting vibration and creating a howling effect.
Also, the problem may lie in the electric motoritself. Wear of the rotor bearings leads to the fact that the shaft begins to rotate with runout. This beating creates a characteristic low-frequency hum, which intensifies as speed increases. In older models, the cause may be loosening of the compressor housing mounting bolts.
To check, you must carefully (observe safety precautions!) touch the housing of the running compressor. If vibration is transmitted to the tubes or body of the refrigerator, the problem is in the fastening. If the motor “pot” itself trembles, the unit probably needs to be replaced or overhauled.
Problems with fans and the No Frost system
In refrigerators with a system No Frost fans often become the source of the howling. Their task is to circulate cold air through the chambers. If the fan blades touch ice or a foreign object, a piercing whistle or howl occurs, very similar to the howling of a blizzard.
Ice freezing on the blades is a common problem when the door seals are damaged or the defrost system is malfunctioning. As ice builds up, it changes the aerodynamics of the impeller, and the air flow begins to “sing.” In addition, the fan bearing itself may dry out and begin to make squeaking-howling sounds when rotating.
Some models have two fans installed: one for the freezer, the other for the refrigerator. To determine which one is making noise, you can try opening the refrigerator door. In many designs, opening the door stops the refrigerator fan. If the howling stops, the problem is in the upper fan.
- 🌬️ Check the fan blades for ice crust or frost.
- 🔧 Make sure the fan housing mounting screws are tightly tightened.
- 🧊 Inspect the evaporator for excessive fouling snow.
- 🔄 Try to manually turn the impeller (with the power off) - the movement should be free.
If the fan is worn out, replacing it is usually not difficult and is cheaper than repairing the compressor. However, it is important to establish the cause of the appearance of ice, otherwise the problem will recur in a short time.
Clogged capillary tube and problems with the refrigerant
One of the most insidious reasons why the refrigerator makes sounds similar to liquid overflowing or whistling wind is clogged capillary tube. This is a thin copper tube in which freon is throttled. If there is moisture or oxidation products in the system, they can clog the lumen.
When clogged, the compressor tries to push the refrigerant through the bottleneck, creating excess pressure in front of the plug and a vacuum after it. This causes a characteristic gurgling, hissing, or even whistling sound that can wax and wane cyclically. People often describe this as “the refrigerator is crying” or “howling.”
Another reason is a freon leak or the presence of air in the system. If the amount of refrigerant has decreased, the compressor begins to work overload, trying to reach the set temperature. The air in the system also creates acoustic effects, since its compressibility differs from the compressibility of freon.
⚠️ Attention: Diagnosis and elimination of blockages in the capillary tube require special tools and skills in working with refrigeration equipment. An independent attempt to clean it can lead to depressurization of the circuit.
Symptoms of such problems can also be insufficient cooling of the chambers during continuous operation of the motor. If you notice that the refrigerator is running non-stop and making strange sounds, the likelihood of problems with the circulation of the refrigerant is very high.
Bushings and fasteners: when little things create noise
Sometimes the cause of the howling lies in trivial little things that are easy to overlook. The refrigerator has many plastic and rubber parts that wear out over time. Particular attention should be paid to the bushings to the gaskets.
The bushings connecting the tubes to the housing or compressor may dry out and lose elasticity. As a result, the metal begins to rub against the metal or plastic, creating a high-frequency whistle when vibrating. Also, the source of sound may be where the tubes pass through the cabinet wall.
Check all visible connections. If you find some tube shaking and touching another part, this could be the cause of the noise. Sometimes it is enough to simply place a piece of rubber or foam rubber to eliminate contact and stop the howling.
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