How does the cooler work in the refrigerator: design, malfunctions and repairs

Have you ever wondered why modern refrigerators work almost silent, and the old models hum like tractors? Or why do some models constantly blow cold air inside, like an air conditioner? It's all about cooler a small but critical element of the cooling system. This fan is responsible for the uniform distribution of cold, prevents the formation of ice and maintains the optimal temperature in each zone.

In this article we will understand how exactly the cooler works in refrigerators of different types - from classic drip to modern systems No Frost. You will find out where it is located, how it is designed and what functions it performs. We will also tell you how to independently diagnose fan malfunctions, why it may make noise or stop working altogether, and what to do about it. If your refrigerator suddenly begins to hum loudly, freezes poorly, or ice freezes on the back wall, most likely the problem is in the cooler.

But before you grab a screwdriver, let's understand the theory. After all, by understanding the principle of operation, you can not only repair the refrigerator, but also operate it correctly to avoid breakdowns in the future.

What is a cooler in a refrigerator and why is it needed?

A cooler (or cooling fan) is an electric motor with blades that provides forced circulation of cold air inside the refrigerator and freezer compartments. Its main task is distribute the cold evenly, which is produced by the compressor, across all shelves and compartments. Without a cooler, the temperature in different parts of the refrigerator may differ by 5–10°C, which leads to food spoilage and increased energy consumption.

Depending on the model of the refrigerator, the cooler can perform different functions:

• 🌀 Blowing the evaporator — in systems No Frost The fan drives air through the radiator with freon, cooling it and removing moisture (so ice does not freeze).
• ❄️ Prevention of frost —in drip refrigerators, the cooler helps to evenly distribute the cold so that thick layers of ice do not form on the back wall.
• 🔄 Circulation between chambers —in two-chamber models, the fan moves air from the freezer to the refrigerator compartment (and vice versa), maintaining the set temperature.
• 📉 Fast cooling —when the mode is activated Super Cool or Fast Freeze the cooler operates at maximum speed, accelerating freezing.

Without a cooler, the refrigerator turns into a regular “cabinet with a compressor”, where cold accumulates only at the bottom (as warm air rises upward). That is why in modern models Samsung, LG, Indesit and Bosch one or even several fans are installed - for the freezer and refrigerator compartment separately.

Where the cooler is located and how it is designed

The location of the cooler depends on the type refrigerator. In most cases, it can be found in the following places:

The cooler itself consists of several key parts:

• 🔌 Electric motor —usually a collector type, operates from 12–24 V (powered through a step-down transformer or electronic unit).
• 🌀 Blades —plastic or metal, balanced for minimal noise (high-quality models use an asymmetrical design).
• 🛡️ Protective grille —prevents foreign objects from entering and damaging the blades.
• 🔄 Bearings —in cheap models, bushings are used (they wear out over time and begin to creak), in premium ones, ball bearings are used.
• 📡 Hall sensor —in modern coolers, it controls the rotation speed and transmits data to the control board.

In refrigerators No Frost the cooler works in tandem with evaporator (a radiator where freon evaporates and cools the air) and defrost heating element (a heating element that is periodically turned on to melt the ice). When the compressor stops, the heating element heats the evaporator, and the cooler continues to blow, accelerating the evaporation of moisture. Therefore, in such models, ice almost never accumulates inside.

Why are there no coolers in some refrigerators?

In budget drip models (for example, Atlant or Biryusa) often do without a fan - the cold is distributed by natural convection. However, this leads to uneven cooling: it can be -2°C below, and +8°C on the upper shelves. Such refrigerators require frequent defrosting and preserve food worse.

How the cooler works in No Frost systems and drip refrigerators

The principle of operation of the cooler is radically different depending on the type of defrosting. Let's look at both options in detail.

🔄 No Frost (Full No Frost, Total No Frost)

In refrigerators with a system No Frost the cooler operates continuously (or with short pauses) and performs three key functions:

1. Intake of warm air —the fan sucks air from the chambers through special channels.
2. Cooling through the evaporator —the air passes through the radiator, where freon picks up heat, and the temperature drops to -10...-20°C.
3. Cold distribution —cooled air through the deflectors is supplied back to the freezer and refrigerator compartment.

The cycle is repeated every 10–20 minutes. In this case, moisture from the air condenses on the evaporator in the form of frost. To prevent ice from accumulating, every 8–12 hours the defrost mode is switched on defrost mode:

1. The compressor stops.
2. The heating element is switched on, which heats the evaporator to +5...+10°C.
3. Cooler continues to work, accelerating the melting of ice and evaporation of moisture.
4. Condensation flows into the pan, where it evaporates naturally.

In refrigerators Total No Frost (for example, Samsung RB37A5200SA or LG GB-B459SLQZ) the freezer cooler blows air across both compartments, and each chamber has its own fan. Full No Frost Each camera has its own fan.

☔ Drip system

In drip refrigerators (for example, Indesit DF 4200 W or Bosch KGN39VL35R) cooler It is less common, but if it exists, it works differently:

• 🌀 The fan turns on only when the compressor is running (in cycles of 10–15 minutes).
• 💧 Cold air is supplied directly to the refrigeration chamber, bypassing the evaporator.
• ❄️ On the back Frost forms on the wall, which when the compressor is turned off melts and flows into the pan (hence the name “drip”).

The main difference from No Frost is that the cooler here is not involved in removing moisture. Its task is only even the temperature across the entire volume of the chamber. Therefore, in drip models, the fan is less powerful and works with less load.

Signs of a cooler malfunction: when it’s time to sound the alarm

The cooler is one of the most vulnerable parts of the refrigerator. Its breakdown is manifested by several symptoms at once, which are difficult not to notice:

• 🔊 Extraneous sounds —creaking, crackling, hum or vibration (most often caused by wear of bearings or ice getting on the blades).
• ❄️ Ice freezing — No Frost ice appears on the back wall of the freezer or evaporator (a sign that the cooler does not pass air).
• 🌡️ Uneven cooling - in the upper part of the chamber it is warmer than at the bottom (a difference of more than 5°C).
• 🚫 The compressor works without stopping — if the cooler is broken, the refrigerator tries to compensate for the lack of cold by constant operation of the motor.
• 💨 Lack of air flow —if you put your hand near the ventilation grilles, you can’t feel a blow.
• 🔥 Overheating of the compressor —due to poor air circulation, the motor overheats and can be switched off due to thermal protection.

The most dangerous situation is when the cooler has completely stopped. In this case, the refrigerator continues to freeze, but only at the bottom of the chamber, and the food on the upper shelves spoils. B No Frost this also leads to icing of the evaporator, which is why after 1-2 days the refrigerator may stop working altogether.

Check if air is blowing from the ventilation holes|Listen for any extraneous noise during operation|Assess the uniformity of cooling (put the thermometer on different shelves)|Check if ice is freezing on the back wall|Make sure that the compressor does not work without stopping-->

Why the cooler breaks down: top 5 reasons

In 80% of cases, the cooler fails for one of five reasons. Let's look at each in detail.

1. Bearing wear is the most common problem in refrigerators older than 5 years. Over time, the lubricant dries out, the bearings wear out, and the fan begins to creak or jam. In cheap models (for example Beko or Vestfrost) plastic bushings are used instead of bearings, which wear out even faster.
2. Icing of the blades - if the No Frost broke Defrost heating element or defrost sensor, ice builds up on the evaporator and blocks the rotation of the cooler. Sometimes it is enough just to defrost the refrigerator for the problem to disappear.
3. Ingress of foreign objects - pieces of food, packaging or even ice crystals can jam the blades. Most often, this happens if the refrigerator is overloaded or products are stored incorrectly (for example, open packages of cereals).
4. Problems with power supply - oxidation of contacts, broken wires or a malfunction of the control board can lead to no voltage being supplied to the cooler. In this case, the fan does not spin at all.
5. Mechanical damage - if you do not defrost or transport carefully, you can damage the blades or throw off the balancing, which is why the cooler begins to vibrate and make noise.

In some cases, the cooler breaks due to factory defect (manufacturer defect). For example, a batch of refrigerators LG GA-B489YDQZ 2021 had a defect in the bearings, due to which the fans failed after 1–2 years of operation. If your model is under warranty, be sure to check if there have been any recalls for this reason.

How to fix a cooler yourself: step-by-step instructions

If you are sure that the problem is in the cooler, you can try to repair it yourself. In most cases, this is no more difficult than fixing a computer fan. The main thing is to follow safety precautions and take your time.

⚠️ Preparing for repairs

⚠️ Attention: Before starting work, be sure to unplug the refrigerator and wait until it is completely defrosted (if ice is blocking access to the cooler). Do not use sharp objects to remove ice - you can damage the evaporator or freon tubes.

You will need:

• ⚒️ Screwdriver (Phillips and flathead).
• 🔧 Pliers or pliers.
• 🧴 Silicone grease (for example, WD-40 Specialist).
• 📏 Multimeter (to check voltage).
• 🧊 Hair dryer (to speed up defrosting).

🛠️ Disassembly and diagnostics

Action algorithm:

1. Remove the back panel in the freezer compartment (in No Frost) or the plastic cover on the back wall of the refrigerator compartment (in drip models), it is usually secured with latches or screws.
2. Find the cooler - it looks like a small motor with blades, covered with a grill.
3. Check whether the blades rotate freely. If they wedge, try to gently rotate them by hand. If you hear a creaking sound, the problem is in the bearings.
4. Inspect the wires and contacts. Oxidation or breakage. a common cause of a non-working cooler.
5. Connect the refrigerator to the network and check whether voltage is supplied to the cooler (it should be 12-24 V). To do this, use a multimeter in voltmeter mode.

If there is no voltage supplied to the cooler, the problem may be:

• 🔌 Control board (requires diagnostics by a specialist).
• 📡 Temperature sensor (if it transmits incorrect data, the board blocks the operation of the fan).
• 🔋 Defrost heating element (in No Frost — if it is burned out, the board may turn off the cooler due to icing).

🔧 Repair or replacement

Depending on the malfunction, proceed as follows:

If the cooler cannot be repaired, it needs to be replaced. To do this:

1. Take a photo of the markings on the old cooler (for example, DC 12V 0.2A).
2. Find a similar one in terms of parameters (voltage, current, sizes).
3. Disconnect the power connectors and fastenings, remove the old cooler.
4. Install a new one, connect the wires and check the operation.

The cost of a new cooler is from 800 to 3000 rubles, depending on the model. For refrigerators No Frost it is better to take original parts (for example, for Samsung - art. DA97-08007A, for LG — 6601JJ1004A).

Prevention: how to extend the life of a cooler

To make the cooler last longer, just follow a few simple rules:

• 🧊 Regular defrosting - even No Frost once a year, turn off the refrigerator for 10-12 hours to remove ice that could not melt Heating element.
• 🍎 Proper storage of food —do not place containers close to the back wall (especially in drip models) so as not to block air circulation.
• 🧹 Cleaning ventilation grilles —dust and grease clog the holes, because of which the cooler works with increased load. Wipe them with a damp cloth every 2-3 months.
• 🔌 Stable power supply —use a surge protector to protect electronics from power surges.
• 🚪 Sealant control —if the door does not close tightly, warm air enters the chamber, and the cooler is forced to work without stopping.

In refrigerators with No Frost pay special attention to the system defrosting:

• Check whether ice is freezing on the evaporator (a sign of a faulty heating element or sensor).
• If the refrigerator starts making noise after defrosting, the cooler may be touching the ice with its blades - you need to repeat the procedure.

In drip refrigerators, watch out for drainage hole - if it gets clogged, the water does not flow into the pan, but freezes on the back wall, blocking the operation of the cooler.

FAQ: Frequently asked questions about the refrigerator cooler

🔊 Why does the cooler in the No Frost refrigerator work all the time?

Normally, the cooler should turn off periodically (for 2–5 minutes every hour). If it works without stopping, the reasons may be the following:

• The door is not closed tightly (check the seal).
• Warm air gets into the chamber (for example, if the refrigerator is next to the stove).
• The temperature sensor is broken (the control board does not receive a signal that the set temperature has been reached).
• The ventilation ducts are clogged (the grilles need to be cleaned).

If the problem is not in the seal, electronics diagnostics are required.

❄️ Is it possible to operate the refrigerator without a cooler?

Technically yes, but with caveats:

• In No Frost without a cooler, the refrigerator will quickly become covered with ice and stop freezing.
• In drip models, the temperature will be uneven (colder at the bottom, warmer at the top).
• The compressor will work with increased load, which will reduce its resource.

If the cooler is broken, it is better to repair it within 1-2 days to avoid more serious damage.

🛒 Where to buy a cooler for a refrigerator and how much does it cost?

You can buy a cooler:

• In the manufacturer's service centers (original spare parts).
• In stores of spare parts for household appliances (for example, 220-volt, All-Zap).
• On marketplaces (Wildberries, Ozon, AliExpress - but be careful with fakes).

Cost:

• Budget models (for example, for Indesit or Beko) - 800–1500 rubles.
• Middle segment (for Samsung, LG) - 1500–2500 rubles.
• Premium (for Bosch, Liebherr) - 2500–4000 rubles.

Before purchasing, check the part number with the markings on the old one cooler.

🔧 Is it possible to lubricate the cooler of a refrigerator with WD-40?

No, WD-40 is not suitable for lubricating cooler bearings. This is a penetrating lubricant that dries out over time and leaves a sticky residue, aggravating the problem. Use instead:

• Silicone grease (for example, WD-40 Specialist Silicone).
• Grease for electric motors (for example, Liqui Moly Silberfett).
• Machine oil (as a last resort, but it is less resistant to low temperatures).

Lubricate the cooler shaft carefully, avoiding getting on the blades and motor windings.

🔇 How to reduce the noise of the cooler in the refrigerator?

If the cooler is noisy, try:

1. Defrost the refrigerator - perhaps the blades are touching ice.
2. Check the cooler fastening - if it is loose, tighten the screws.
3. Lubricate the bearings (if they creak).
4. Make sure that the refrigerator is level (vibration can increase the noise).
5. If all else fails, replace the cooler with a new one (in older models, noise may be caused by wear of parts).

In refrigerators No Frost noise up to 40 dB is considered normal.