When the usual hum in the kitchen is replaced by an irritating roar or periodic blows, it becomes impossible to ignore. The old refrigerator is noisy for various reasons, ranging from the banal loss of elasticity of the rubber bands to wear and tear of the motor-compressor. If you notice that a household appliance is making sounds that were not there before, or its operation has become noticeably louder, this is a signal for immediate action.
Ignoring extraneous noise can lead to complete breakdown of the unit and spoilage of food. In this article we will analyze in detail the mechanics of the occurrence of sounds in refrigerators of various generations, from Soviet models to modern No Frost systems. You will learn how to independently carry out initial diagnostics, which parts require replacement, and in which cases noise is an acceptable norm for aging equipment.
It is important to understand that compressor is the heart of the refrigerator, and its operation is never absolutely silent. However, the nature of the sound can tell a lot about the state of internal systems. Humming, gurgling, crackling or whistling - each of these sounds indicates a specific malfunction. Correct interpretation of acoustic signals will help you save on calling a technician, or at least prepare for serious repairs.
Natural wear and loss of sound insulation
Over the years, the materials used in assembling the refrigerator lose their original properties. The plastic of the case may dry out, and the rubber seals may harden. It is these changes that often become the reason why it is an old refrigerator is noisy stronger than in the first years of operation. Vibration from a running motor is transmitted to the body, and if the damping elements are worn out, the metal body begins to resonate, increasing the hum significantly.
Particular attention should be paid to the places where the compressor is attached. Modern models use rubber washers or springs that dampen vibration. Over time, the rubber becomes dull, cracks, or even falls apart. As a result, the metal frame of the compressor begins to (directly contact) the metal frame of the refrigerator, creating a drum effect. Replacing such vibration dampers is an inexpensive procedure, but requires care.
⚠️ Attention: Before touching the compressor mounts, be sure to disconnect the refrigerator from the power supply! Working with electrical appliances under voltage is deadly.
Another reason for increased noise may be the displacement of the unit itself relative to the floor. If the legs of the refrigerator are not adjusted or one of them is broken, the body will warp. This leads to uneven distribution of the load and the appearance of squeaks when opening doors or cycling the engine. Checking the horizontal installation is the first step in diagnosis.
Do not forget about the capacitor grille on the rear wall. In older models, it is often secured with flimsy clips that weaken over time. When the metal heats up, it expands, when it cools, it contracts, and if the fastener is loose, you will hear a characteristic crackling or ringing sound. Fixing the grille with additional clamps or gaskets often solves the problem.
Compressor diagnostics: knocking, humming and vibration
The loudest element of any refrigerator is the compressor motor. If The old refrigerator is noisy it is because of it, the nature of the sound will be low and booming, sometimes turning into a metallic clang. The piston group inside the compressor operates in oil, and if the lubricant level drops or the oil thickens, the parts begin to run dry. This leads to accelerated wear and the appearance of knocking.
A situation often occurs when the compressor hums, but does not start, or starts with a loud click and hum, and then turns off. This may indicate problems with the start relay or motor windings. In older models, such as Biryusa or Atlantthe start relay is often designed as a black cylinder on the side of the compressor. Replacing it is a common procedure when repairing age-old equipment.
The vibration of the compressor is also transmitted to the connecting copper tubes. If the tubes are located close to each other or touch the body, they begin to rattle in time with the action of the piston. By carefully bending the tubes by hand (only with the refrigerator turned off and cooled down!), you can check whether the nature of the noise changes. To fix the tubes, use special plastic holders or soft insulation.
☑️ Primary diagnostics of the compressor
If you hear that the motor is constantly humming without turning off, and the refrigerator does not freeze well, this may indicate a loss of compression or a refrigerant leak. In this case, noise is a secondary sign of a more serious problem. Tightness diagnostics The system requires special equipment and skills, so in such cases it is better to turn to professionals.
No Frost system and fan problems
In refrigerators with system No Frost the source of noise is often a fan circulating cold air. If your old refrigerator makes noise like a plane or makes whistling sounds, you should check this unit first. Over time, the fan bearings dry out and ice builds up on the blades, leading to imbalance and vibration.
Ice can build up not only on the evaporator, but also on the fan blades if the defrost cycle is disrupted. Pieces of ice breaking off can get under the blades, causing cracking and grinding noises. In this case, it is necessary to completely defrost the refrigerator, leaving it turned off for 24 hours. If after defrosting the noise disappears, but returns after a while, the problem lies in the defrosting system (heating element, timer or sensor).
The fan may also make noise due to foreign objects or products getting into its rotation zone. In older models, the plastic baffles could become dislodged and begin to touch the blades. Replacing a fan is a simple process, but requires partial disassembly of the freezer or the back panel.
How to replace a fan in No Frost?
To replace it, you need to remove the back panel in the freezer, disconnect the power supply, unscrew the mounting screws and install a new fan. It is important to make sure that the fan model matches in size and voltage (usually 220V or 12V).
It is worth noting that in dual-compressor models, noise may come from the condenser fan located at the bottom of the refrigerator, near the compressor. It is designed to cool the radiator and when contaminated with dust it begins to work with overload, making loud sounds. Cleaning this unit with a vacuum cleaner often returns silence.
Refrigerant and gurgling sounds in the pipes
One of the most common questions is: why is the refrigerator gurgling? The sounds of flowing liquid, hissing and gurgling in most cases are an absolutely normal operating process. Refrigerant (freon) circulating through the system constantly changes its state of aggregation from liquid to gaseous and back. This process is accompanied by characteristic sounds, especially immediately after the compressor is turned off.
However, if the gurgling becomes too loud, turns into a whistle or is accompanied by a hissing sound similar to a gas leak, you should be wary. In old refrigerators, the soldering joints of the tubes could oxidize or microcracks could become through. If you smell oil or chemicals near the refrigerator, this may indicate a freon leak along with the oil.
Hydraulic hammer is another cause of noise in the pipes. It occurs if too much oil has entered the system or if the refrigerator was transported incorrectly (lying on its side for less than the recommended time before turning on). In this case, liquid oil enters the compression chamber of the compressor, causing loud knocks.
| Sound type | Probable cause | Normal or breakdown |
|---|---|---|
| Quiet gurgling | Freon circulation | Normal |
| Loud hissing | Refrigerant leak | Failure |
| Periodic clicking | Thermostat operation | Normal |
| Metallic ringing | Tubes touching the body | Needs elimination |
| Whistling during operation | Fan malfunction | Failure |
It is important to distinguish between operating sounds and distress signals. If gurgling is accompanied by a lack of cold or the formation of ice in unintended places, this is a reason to call a technician to check the pressure in the system and look for leaks.
Influence of location and foreign objects
Sometimes the reason The noise does not lie in the refrigerator itself, but in what is located next to or inside it. An old refrigerator is noisy he is stronger if it is standing close to a wall or furniture. The gap between the back wall and the wall should be at least 5-10 cm for free air circulation and vibration damping. The sticking of the back wall to the rough surface of wallpaper or plaster can create resonance.
Inside the refrigerator, the source of rattling can be a poorly secured shelf, a bottle that touches another, or an egg tray that is loose. In older models, plastic elements become brittle and produce unpleasant sounds when vibrating. Checking the contents and fixing the shelves is the easiest way to exclude external factors.
⚠️ Attention: Do not install the refrigerator next to a sink or radiator. Humidity and heat accelerate the corrosion of the cabinet and the destruction of insulating materials, which increases the noise.
It is also worth checking whether food is touching the back wall of the refrigerator. Ice may form at the contact points, which will crack and crunch when the compressor operates. The correct one loading the chambers involves a distance from the walls of a couple of centimeters.
When urgent repairs or replacement are needed
There are a number of symptoms that make operating a noisy refrigerator dangerous or economically unfeasible. If an old refrigerator is noisy the walls are shaking, and at the same time there is a smell of burning or scorched wiring coming from it, immediately unplug the device from the network. This may indicate an interturn short circuit in the compressor windings or overheating of the wiring.
Replacing a compressor in an old refrigerator is often comparable in cost to buying a new budget model. In addition, older refrigerator models (especially those manufactured before 2010) use refrigerants that are prohibited or restricted in use today, and their energy efficiency is extremely low. A noisy motor in this case is just the tip of the iceberg.
If you hear a loud metallic knock inside the compressor, this indicates destruction of the valve group or piston. Repairing such a unit at home is impossible; hermetically sealed and vacuuming the system is required. In 90% of cases with such symptoms, the unit must be disposed of.
Do not forget that even a working, but very old refrigerator consumes significantly more electricity. Noisy operation often correlates with low efficiency. By deciding to replace, you will not only get rid of noise, but also save on electricity bills.
FAQ: Frequently asked questions
Why did the old refrigerator start making noise after defrosting?
After defrosting, ice could remain in the system, which, when turned on, got into the fan or created a hydraulic lock. It is also possible that during cleaning the tubes were touched or the shelves were not inserted properly. Let the refrigerator run for several hours; if the noise does not subside, check the fastenings.
Is it possible to lubricate the compressor so that it makes less noise?
No, the compressor is a sealed unit and is not intended for maintenance at home. An attempt to drill or open it will result in instant freon leakage and failure. Only the fan bearings are lubricated (if the design allows), but not the motor itself.
Is it normal for the refrigerator to click when turned off?
Yes, this is absolutely normal. The thermostat or thermal protection relay makes a click, opening the compressor power circuit. Also, a characteristic sound can be produced by the expanding or contracting plastic of the case when the temperature changes.
Does the old refrigerator hum louder than the new one?
As a rule, yes. New models use inverter compressors and improved sound insulation materials, which makes their operation almost silent. Old linear compressors operate cyclically (on/off) and create more noise and vibration.
What to do if the refrigerator hums, but does not freeze?
This is a sign of a serious malfunction: a freon leak, a clogged capillary system, or a compressor failure. You cannot operate such a device; the food will spoil and the motor may burn out. You need to call a technician for diagnostics.