Failure of the freezer compartment is always stressful, because food supplies are at risk. If you notice that temperature the chamber has ceased to drop to the required values, and a “coat” of ice has formed on the walls or, conversely, a complete thaw reigns, most likely the problem lies in the evaporator itself or its piping. Replacing a freezer in a refrigerator is a complex technical process that requires not only physical strength, but also specific knowledge about the structure of the refrigeration circuit.
Many users mistakenly believe that it is enough to simply buy a new box and insert it in place of the old one. However, in most modern models, the freezer compartment is evaporatorsealed in a metal sheet or aluminum profile, which is part of a sealed refrigerant circuit. You cannot simply remove and replace it without the participation of a specialist with equipment for working with freon. In this article, we will analyze the nuances of when independent replacement is possible, and when you can’t do without a specialist.
Before taking active steps, it is necessary to carry out a thorough diagnostics. Sometimes the problem is solved by replacing the thermostat or fan, and the freezer itself remains intact. But if you know for sure that a microcrack has formed in the aluminum box and a gas leak has occurred, or the body has suffered irreparable mechanical damage, then replacement becomes the only way out. It is important to understand that we are talking about serious repairs.
Diagnostics and preparation for replacing the unit
The first step is always an accurate determination of the malfunction. If the refrigerator has stopped freezing, but the compressor is running non-stop, this is a sure sign of a leak in the system or a clogged capillary tube. A visual inspection of the internal plastic or aluminum box may reveal swelling, which often indicates delamination of materials or the presence of ice between the walls. Tightness is a key parameter that needs to be checked.
To access the inside of the unit, you will need to completely defrost the refrigerator. This is not just removing the food, but waiting for 24 hours until the ice disappears completely. After defrosting, remove all shelves, drawers and decorative panels. You will need to reach the back wall of the freezer compartment or remove the entire inner liner if the design requires it. Often it is under the plastic casing that the evaporatoris hidden, which must be replaced.
You will need basic tools: a set of screwdrivers, pliers, a knife, and possibly also sealant and insulating materials. If you plan to change not just a plastic box, but the entire evaporation unit, then you cannot do without a blowtorch, a vacuum pump and a pressure gauge station. However, when it comes to replacing the outer box in models with a remote evaporator (where the tubes are glued on the outside), the task is simplified. In any case, electrical safety should be a priority - disconnect the device from the network.
⚠️ Attention: If during defrosting you find oil at the bottom of the chamber or feel a specific chemical smell, this is a direct sign of depressurization of the circuit. Further operation without repair will lead to the compressor burning out.
It is also important to determine the type of freezer you have. In systems No Frost replacement may require the removal of fans and defrost sensors that are attached to the evaporator housing. In static models (“crying” effect), the design is simpler, but requires care when working with fragile aluminum. Do not rush to tear off the fastenings until you understand which communications are suitable for the unit.
Necessary tools and materials
The quality of the work directly depends on the preparation. To replace the freezer evaporator or its plastic casing, you will need a specific kit. You should not try to do the work “on your knees” with only a knife, as this can lead to damage to neighboring units. The main tool for working with metal and pipes will be a torch, and for disassembling plastic - a neat toolkit.
The list of necessary equipment is as follows:
- 🔧 A set of screwdrivers (Phillips, flat, Torx) and wrenches for dismantling fasteners.
- 🔥 Blowtorch or gas torch for working with copper tubes (if the evaporator is changed).
- 🧪 Solder (silver-containing or tin-lead) and flux for soldering.
- 🌡️ A vacuum pump and a pressure manifold for charging the system.
- 🧴 Refrigerant cylinder (freon R134a or R600a depending on the model).
Also do not forget about consumables: insulation for tubes, silicone sealant (heat-resistant), polyurethane foam (for filling voids) and rags. If you are only replacing the plastic container, you may need plastic glue or a special compound to seal the seams. It is important that all materials used are compatible with food products, since they are located inside the chamber.
Pay special attention to personal protective equipment. Working with open flames and chemicals requires caution. Gloves and safety glasses will protect you from burns and small chips getting into your eyes. When soldering, ensure good ventilation of the room, as flux vapors and possible freon residues can be harmful to health.
⚠️ Attention: Freon R600a (isobutane), used in many modern refrigerators, is explosive. Soldering work in a circuit with this gas requires special care and preliminary purging of the system with nitrogen to avoid popping.
Dismantling the old freezer
The dismantling process begins with freeing up space. Remove all drawers, shelves and removable items. If your model allows, remove the freezer door so it does not obstruct your view or access. Next comes the step of disconnecting the electrical components. Carefully disconnect the wires going to defrost sensor, the thermostat and the fan (if there is one). It is recommended to photograph the connection diagram before disconnecting the contacts.
If the evaporator is being changed, the next step is to disconnect the copper tubes. Where the tubes enter the camera body (usually these are holes in the back wall), you need to carefully cut out the thermal insulation. Using wire cutters or a metal file, cut through the copper tubes at a distance of 10-15 cm from the entrance to the housing. Do not use open fire to anneal tubes near plastic to avoid damaging the refrigerator body. After this, you can remove the old unit.
In models where the evaporator is “frozen” into the housing foam, dismantling turns into a complex operation. Often you have to cut out part of the rear wall of the refrigerator from the street side to gain access to the fasteners. If you are changing only the inner plastic box (for example, it is cracked), then the task is simpler: unscrew the screws around the perimeter and carefully pry off the edges with a spatula. Try not to damage the layer thermal insulationthat is located behind the plastic panel.
After removing the old element, thoroughly clean the niche from any remaining foam, dirt and old sealant. The surface must be dry and degreased to install a new part. Check the condition of the door seal: if it is worn out, it is also better to replace it so that the new freezer works efficiently.
☑️ Removal checklist
Installing a new evaporator and assembly
Installation of a new node begins with preparing the seat. If you are installing a mounted evaporator (plate type), it must be pressed tightly against the back wall of the chamber or the bottom. To improve heat transfer between the aluminum evaporator plate and the chamber wall, it is recommended to use thermally conductive paste or simply ensure the tightest possible contact. Secure the evaporator using standard fasteners or aluminum tape, if the design allows.
The next critical stage is soldering the tubes. New evaporator tubes must be connected to the refrigerator lines. Strip the ends of the copper tubes, put on the coupling (if used) and heat the connection with a torch. Apply solder - it should flow evenly around the connection on all sides. After cooling, check the quality of the seam visually: there should be no holes or cracks. Tightness connections are the key to success.
After soldering, it is necessary to restore the thermal insulation. The voids around the tubes and behind the new evaporator must be filled with polyurethane foam with a low coefficient of expansion or special thermal insulation materials. Do not leave air pockets, otherwise the efficiency of the refrigerator will decrease and condensation will accumulate on the walls. Allow the foam to dry completely before proceeding further.
The final stage of mechanical assembly is installing the plastic box (if it was removed), connecting the electrical and installing the doors. Make sure that the wires are not pinched or touch hot areas when soldering. All connectors must be latched until a characteristic click is heard. Now the system is ready for leak testing and refilling.
| Type of fault | Difficulty of replacement | Required equipment | Risk of error |
|---|---|---|---|
| Cracked plastic drawer | Low | Screwdriver, glue | Minimal |
| Leakage in the foamed evaporator | High | Burner, pump, freon | High |
| Fan breakdown No Frost | Medium | Screwdriver set, multimeter | Medium |
| Replacing the defrost sensor | Low | Screwdriver, soldering iron | Low |
What is a “heat exchanger” and where is it located?
The heat exchanger (condenser) in modern refrigerators is often located in the side walls of the case. When replacing the freezer, it is important not to damage the tubes running inside the polyurethane foam layer of the sides, otherwise you will have to change the entire refrigerator.
Evacuating and charging with refrigerant
The most crucial moment is removing air and moisture from the system. After soldering, air containing moisture remains in the tubes. When the refrigerator is running, this moisture will freeze in the capillary tube, forming an ice plug, and the system will stop working. Therefore, the use vacuum pump is mandatory. Connect the pump to the service fitting (which you should have cut into the system in advance) and turn it on.
The vacuum process should last at least 30-40 minutes. The pressure gauge should show a deep vacuum (about -1 bar or 750 mm Hg). If the arrow creeps back, it means that there is a leak in the system, and you need to look for the leak. Only after confident evacuation can you begin refueling. Close the valve on the manifold, turn off the pump and quickly connect the freon cylinder.
Refrigerant must be charged strictly according to the weight indicated on the refrigerator nameplate (usually on the back wall or inside the chamber). Use electronic scales to control the amount of gas being charged. It is strictly forbidden to refill “by eye” or by static pressure for modern systems with a capillary tube and freon R600a - this will lead to incorrect operation or breakdown of the compressor. Dosage must be accurate to the gram.
⚠️ Attention: Technical characteristics and required The amount of refrigerant may vary depending on the specific modification of the refrigerator, even within the same series. Always check the factory sticker on your device.
After refueling, solder the service nipple, turn on the refrigerator and check its operation. The compressor should turn on, and after 15-20 minutes the tubes leaving the freezer should begin to cool. Check the tightness of all new connections with a soap solution - the appearance of bubbles will indicate defective soldering.
Common mistakes and checking the result
Even experienced professionals sometimes make mistakes, not to mention beginners. One of the most common problems is insufficient adherence of the evaporator to the chamber walls. If there is a gap between the aluminum and the housing, heat transfer will be disrupted, the compressor will wear out, and the temperature will not reach normal. Use aluminum tape to secure and improve contact.
The second mistake is using the wrong solder or overheating the tubes when soldering. Overheated copper becomes brittle and can burst under the vibration of the compressor. It is also dangerous if a large amount of flux gets inside the tubes, which can lead to blockage capillary system. All work must be carried out carefully, using nitrogen purge during soldering, if possible.
After assembly and first start-up, let the refrigerator operate for several hours without loading food. Check that the cooling is uniform throughout the entire freezer area. There should not be areas where it is warm while ice is already frozen in another corner. If all parameters are normal, you can install shelves and load products. Regularly monitor the operation of the unit in the first week.
Remember that replacing a freezer is a complex intervention in the system. If you are not confident in your abilities at the soldering or filling stage, it is better to stop at the dismantling stage and invite a professional for the final stage. This will save you money on repeated repairs and save your nerves.
Is it possible to replace a freezer without charging with freon?
No, it is not possible. The freezer chamber (evaporator) is part of a sealed refrigerant circuit. When replacing it, the circuit breaks, the freon evaporates, and the system fills with air. Without vacuuming and new refilling, the refrigerator will not work.
How much does it cost to replace the evaporator in the service?
The cost consists of the price of the spare part and the work of the technician. On average, replacing the evaporator in a freezer can cost from 3,000 to 8,000 rubles and more, depending on the model of the refrigerator and the difficulty of accessing the unit (whether it is foamed or not).
Why does the refrigerator not turn off for a long time after replacing the freezer?
This may be due to several reasons: insufficient amount of freon, presence of air in the system (poor vacuum), thermostat malfunction or loose door seal. It is also possible that the new evaporator has lower heat transfer efficiency.
How to understand that the evaporator is broken?
Main signs: the refrigerator works constantly, but does not freeze; swelling or traces of rust are visible on the back wall inside the chamber; when defrosting, the hissing of escaping gas can be heard from the outlet of the tubes; Oil is visible on the cut of the tubes.
Is it necessary to change the filter drier when replacing the freezer?
Yes, definitely. The filter drier is a disposable element. Each time the circuit depressurizes, it becomes saturated with moisture from the air. If you leave the old filter, moisture will quickly damage the new compressor or clog the capillary tube.