How to clean the capillary tube of a refrigerator: 5 working methods

A capillary tube is a narrow channel in the refrigerator that regulates the supply of refrigerant (freon) to the evaporator. Over time, it can become clogged due to moisture, oil, small particles, or metal oxidation. If you notice that the refrigerator does not freeze well, the compressor is running non-stop, and ice is forming on the back wall, most likely the problem is in the capillary. Cleaning this part does not require professional skills, but will require accuracy and compliance with safety precautions.

In this article we will analyze causes of blockages, describe in detail all stages of cleaning (from preparation to testing the system), and also tell you what mistakes beginners most often make. You will learn what tools you will need, how to avoid damaging the tube, and when you should still contact a professional. If your refrigerator Indesit, Samsung, Atlant or another brand, the instructions are suitable for most models with a capillary system.

Signs of a clogged capillary tube

Before you start cleaning, make sure that the problem is in the capillary. Here are the key symptoms:

• 🔴 The compressor works continuously (or with minimal pauses), but the refrigerator does not cool.
• ❄️ Forms on the back wall of the freezer thick layer of ice (even in models with No Frost).
• 🌡️ The temperature in the main chamber rises to +10...+15°C, the thermostat is set to maximum.
• 💧 Condensation accumulates on the floor under the refrigerator (due to overheating of the condenser).
• 🔊 The compressor began to work louder, metallic knocking or vibration appeared.

If at least 2-3 signs coincide, the probability of capillary blockage is 80-90%. However, similar symptoms can be caused by other malfunctions: freon leak, thermostat failure, or failure of the compressor motor. To exclude them, carry out a simple check:

⚠️ Attention: If the refrigerator does not turn on at all (there is no sound of the compressor running), the problem is not in the capillary. This may be a malfunction of the starting relay, electrical wiring or control unit.

For an accurate diagnosis, unplug the refrigerator, defrost it (if there is ice) and turn it on again. If after 1-2 hours the compressor has not turned off and the temperature has not dropped below +8°C —proceed to clean the capillary.

Causes of blockages: what blocks the capillary?

The capillary tube does not clog immediately - it is a gradual process. The main culprits:

1. Moisture and ice. If moisture gets into the system (for example, when freon is charged incorrectly), it freezes in the narrow channel of the tube, forming a plug. Most often this happens in refrigerators with isobutane (R600a) —it is hygroscopic.
2. Oil and dirt. When the compressor wears out, oil particles and metal shavings get into the tube. Over time, they accumulate in narrowings.
3. Oxidation of copper. In old refrigerators (over 10 years old), the inner walls of the tube oxidize, forming a plaque that narrows the lumen.
4. Foreign particles. If the quality is poor during repairs (for example, after soldering), sawdust or solder may get into the system.

In models with linear compressor (for example, LG Inverter Linear Compressor) blockages are less common, but are still possible due to the high sensitivity of the system to the purity of freon. If you have recently refilled the refrigerator, there is a high risk that the technician used low-quality refrigerant or did not evacuate the system before refilling.

If the blockage is caused moisture, you can eliminate it yourself. In cases with oil or metal particles it may be necessary to replace the filter drier or even the capillary tube. It is difficult to assess the type of blockage without special equipment, so start with the most gentle methods (blowing and warming up).

Preparation for cleaning: tools and safety measures

Before disassemble the refrigerator, prepare everything you need. You will need:

• 🔧 Set of screwdrivers (cross, flat) - for dismantling the back panel.
• 🔥 Gas torch or hair dryer - for warming up the tube.
• 🧲 Magnet - so as not to lose small fasteners (screws, washers).
• 🧴 Solvent (acetone or R141b) - for washing (only for experienced ones!).
• 🛠️ Pipe cutter and rolling - if necessary cutting the tube.
• 🧤 Rubber gloves and goggles —freon and solvents are toxic!

Also prepare the workplace:

1. Unplug the refrigerator and defrost it (at least 12 hours).
2. Move the appliance away from the wall to gain access to the back panel.
3. Cover the floor with cardboard or film - drops of solder may fall when soldering.
4. Ensure good ventilation (open the windows) - when heated, freon can emit harmful fumes.

⚠️ Attention: If your refrigerator runs on Freon R600a (isobutane), remember: it is explosive! Do not use open flames near pipes. It is better to warm them up with a construction hairdryer.

Before starting work, take a photo of the location of all the tubes and wires on the back panel - this will help to correctly assemble the refrigerator back. If you have never dealt with refrigeration equipment, practice on an unnecessary piece of copper tube (for example, from an old air conditioner).

Unplugged and defrosted|Rear panel removed|Photos of tube locations taken|Tools and PPE prepared|Ventilation of room checked-->

Method 1: Warming up capillary tube (for ice plugs)

This is the simplest and safest method that helps in 70% of cases. It is effective if the blockage is caused by moisture that has frozen in the tube. You do not need to depressurize the system or use chemicals.

Action algorithm:

1. Remove the back panel of the refrigerator to gain access to the capillary tube. It is thin (diameter ~1-2 mm) and usually goes from the filter-drier to the evaporator.
2. Find the section of the tube that goes in front of the evaporator (it is often covered with ice or frost).
3. Turn on the hair dryer at minimum power (100-150°C) and evenly warm up the tube for 5-10 minutes. Do not direct the air flow to plastic parts!
4. Check whether freon has flowed through the system: listen to the hissing or touch the tube - it should become cold.

If after warming up the compressor starts working in normal mode (turns on and off with pauses), and the temperature in the chamber began to drop - the blockage was eliminated. If not, repeat the procedure or move on to the next method.

Do not use open fire (lighter, alcohol lamp) for warming up - this may damage the tube or cause a freon leak. Also, do not heat the tube for more than 15 minutes at a time: let it cool to avoid deformation.

Method 2: Blowing with nitrogen (for persistent blockages)

If heating does not help, most likely the blockage is caused not by ice, but by mechanical particles. In this case, blowing nitrogen under pressurewill help. This method requires special equipment (a nitrogen cylinder and a reducer), but it can be rented or bought in stores for welding.

Step-by-step instructions:

1. Bite off the capillary tube at a distance with a pipe cutter 10-15 cm from the filter drier. Be careful - oil may splash out of it!
2. Connect the tube from the nitrogen cylinder through the reducer to the cut end. The pressure should be 6-8 atmospheres.
3. Direct a stream of nitrogen into the tube in short pulses (in 2-3 seconds). This will help knock out the plug without damaging the tube.
4. If the blockage has passed, you will hear a characteristic hissing sound at the outlet of the tube (from the evaporator side).
5. Solder the cut section of the tube using solder and a torch. Use flux for copper and tin-lead solder.

Be sure to Replace the filter drier after purging - it could become clogged with particles that were knocked out of the tube. If this is not done, the blockage will return after 1-2 months.

⚠️ Attention: When soldering, do not overheat the tube - this may lead to melting or leakage of freon. Optimal soldering temperature: 250-300°C.

If after purging the freon still does not circulate, the blockage may be deeper or the tube is deformed. In this case, you will need to replace the capillary or professional ultrasonic cleaning (this is done in service centers).

What to do if there is no nitrogen?

You can use compressed air from a compressor (for example, a car), but the pressure should not be higher than 4 atmospheres. Important: the air must be dry, otherwise moisture will enter the system and aggravate the problem. After purging, be sure to vacuum the system before charging freon.

Method 3: Solvent flushing (for oil plugs)

If the blockage is caused by an accumulation of oil or dirt, chemical flushing will help. This method is more aggressive and requires caution, as solvents can damage seals or plastic parts.

What you will need:

• 🧪 Solvent R141b (special for refrigeration systems) or acetone.
• 💉 Volume syringe 20-50 ml with a needle.
• 🔧 Soldering iron and solder (for sealing after rinsing).

How to rinse:

1. Cut the capillary tube of the filter-drier (as in the nitrogen method).
2. Fill the syringe with solvent and slowly inject it into the tube. Do not use force - if the solvent does not pass, the clog is too dense.
3. Leave the solvent inside for 10-15 minutesthen blow the tube with nitrogen or compressed air.
4. Repeat the procedure 2-3 times until dirt will not stop appearing at the outlet.
5. Solder the tube and replace the filter drier.

After washing be sure to vacuum the system for 15-20 minutesto remove any remaining solvent. If this is not done, it will mix with freon and worsen the operation of the compressor.

⚠️ Attention: Do not use gasoline, kerosene or other aggressive solvents for flushing! They can destroy the rubber seals and damage the compressor.

If the blockage remains after washing, it means that the tube is deformed or too many metal particles have accumulated in the system. In this case, you will need to replace the capillary or professional diagnostics.

Method 4: Replacing the capillary tube (as a last resort)

If none of the methods helped, most likely the tube is damaged or clogged irreversibly. In this case, it will have to be replaced. This is the most time-consuming method, but it is guaranteed to solve the problem.

What needs to be done:

1. Purchase a new capillary tube of the same diameter and length. For most refrigerators, copper with a diameter of 1.5-2 mm is suitable..
2. Bite off the old filter-drier and evaporator tube. Be careful not to damage other elements of the system.
3. Using flaring, flare the ends of the new tube and connect them to the system by soldering.
4. Replace the filter drier (it always changes when the system is depressurized).
5. Vacuum the system and refill Freon. For this you will need vacuum pump and manometric manifold.

It is better to entrust freon charging to a professional, since an exact amount of refrigerant is required (excess or undercharging will lead to breakdown compressor). If you decide to do this yourself, use scales for freon and follow the instructions for your refrigerator model.

After replacing the tube and refilling the freon, turn on the refrigerator and check its operation. The compressor should turn on with pauses, and the temperature in the chamber should drop to +4...+6°C within 1-2 hours.

What to do after cleaning: testing and prevention

After cleaning the capillary tube, you need to make sure that the system is working correctly. Here's what you need to do:

• 🔍 Check the temperature: Put the thermometer in the freezer and main chambers. After 2 hours, the temperature should be -18°C and +4°C respectively.
• ⏱️ Monitor the compressor operating cycle: It should turn on at 10-15 minutes and turn off at 20-30 minutes.
• 💧 Inspect the back wall: There should be no ice or condensation on it.
• 🔊 Listen to the compressor: It should work smoothly, without knocking or vibration.

If the refrigerator is working normally, carry out preventive maintenance to avoid repeated blockages:

1. Defrost the refrigerator at least once every 6 months (even if it has a No. Frost).
2. Do not store liquids in open containers in the chamber - moisture may enter the system.
3. Monitor the condition of the door seal. If it is worn out, replace it - this will prevent the formation of condensation.
4. When refilling freon, use only high-quality refrigerant and be sure to vacuum the system.

⚠️ Attention: If after cleaning the capillary the refrigerator still does not freeze, the problem may be in the compressor, thermostat or freon leak. In this case, you cannot do without professional diagnostics.

If you are not confident in your abilities, it is better to contact a service center. The average cost of cleaning a capillary from a specialist is 2000-4000 rubles, which is cheaper than repairing a compressor after unsuccessful self-cleaning.

Common mistakes when cleaning the capillary

Even experienced craftsmen sometimes make mistakes that lead to repeated breakdowns. Here's what cannot be done - this can lead to its melting or leakage of freon. Optimal warm-up temperature::

• 🔥 Overheat the tube - this can lead to its melting or leakage of freon. Optimal warm-up temperature: 100-150°C.
• 💨 Use too high a pressure when blowing. Maximum - 8 atmospheres, otherwise the tube will burst.
• 🧴 Rinse tube with gasoline or kerosene - they destroy the seals and leave an oily film.
• ❄️ Forgetting to vacuum the system before filling with freon. Remaining air or moisture will lead to re-clogging.
• 🔧 Soldering the tube without flux this will lead to oxidation and rapid re-clogging.

Another common mistake — ignoring to replace the filter drier. This item is inexpensive (from 200 rubles), but its replacement is required for any intervention in the system. If you leave the old filter, it will quickly become clogged with particles that have been knocked out of the tube, and the problem will return.

If you made one of these mistakes, don't panic. In most cases, the situation can be corrected. For example, if a tube bursts during purging, it can be soldered or the damaged area can be replaced. If moisture gets into the system, it is enough to vacuum it longer than usual (30-40 minutes).

FAQ: Answers to frequently asked questions

Is it possible to clean the capillary without disassembling the refrigerator?

No, this is impossible. Capillary the tube is located inside the system, and access to it is only after removing the back panel. The only thing that can be done without disassembling is to defrost the refrigerator for 24 hours, but this only helps with minor ice jams.

How much does it cost to clean the capillary in the service?

The cost depends on the region and the complexity of the work:

• Diagnostics - 500-1000 rubles.
• Cleaning (warming up, purging) - 1500-3000 rubles.
• Replacement of capillary + freon refilling - 3500-6000 rubles.

Some services offer comprehensive repairs (cleaning + oil change + compressor diagnostics) for 4000-5000 rubles.

How often do you need to clean capillary?

Normally, the capillary tube does not require cleaning during the entire service life of the refrigerator (10-15 years). Cleaning is needed only when signs of blockage appear. To avoid problems:

• Defrost the refrigerator every 6 months.
• Make sure it is sealed. doors.
• Do not store open liquids in the chamber.

If the refrigerator is older than 10 years, the risk of blockages increases due to natural wear.

Can a compressor from a car be used for purging?

Yes, but with with reservations:

• The pressure should not exceed 4 atmospheres.
• The air must be dry (use a moisture separator).
• Blow the tube with short pulses (by 2-3 seconds).

After purging, be sure to vacuum the system, as there may be moisture in the compressor.

What to do if after cleaning the refrigerator still does not freeze?

Possible reasons:

• Insufficient refilling freon (needs to be topped up).
• Damage to the compressor (check if it turns on).
• Clog elsewhere in the system (for example, in the condenser).
• Malfunction of the thermostat or electronic unit.

In this case, it is better call a technician for a full diagnosis.