A capillary tube is a narrow channel in the refrigerator that regulates the flow of refrigerant (freon) and maintains the required pressure in the system. Over time, it can become clogged with small particles of oil, moisture, or refrigerant decomposition products. This leads to disruption of freon circulation, compressor overheating and poor cooling. If the refrigerator freezes worse, and the compressor works without stopping, the problem may lie in a clogged capillary.
Rinsing the capillary tube is not an easy task. It requires accuracy, special tools and an understanding of the principles of operation of refrigeration equipment. In this article we will analyze how to flush a capillary tubewhich tools are safe for the system and which are strictly prohibited. You will also find step-by-step instructions for cleaning yourself and tips on how to avoid repeated blockages.
Signs of a clogged capillary tube
Before you start flushing, make sure that the problem is really in the capillary. Here are the key symptoms:
- 🔥 The compressor works without stopping, but the refrigerator does not cool or freezes weakly.
- ❄️ The condenser (grid at the back) remains coldalthough it should heat up.
- 💧 Frost or ice appears on the tubes in atypical places (for example, on the capillary at the entrance to the evaporator).
- 🔊 Unusual sounds: gurgling, hissing or clicking in the system (may indicate plugs in the tube).
If you observe at least 2-3 signs from the list, the probability of capillary clogging is high. However, similar symptoms can be caused by other malfunctions: freon leak, thermostat failure or compressor failure. To exclude them, check:
- 🔧 Condition start relay compressor (there should be no melting or burning smell).
- 📉 System pressure (if there is a pressure gauge) - if there is a blockage, it will be higher than normal at the outlet of the compressor.
⚠️ Attention: If the refrigerator is under warranty, do not disassemble it yourself! Opening the seals will void the warranty. Contact the service center.
What can you use to wash the capillary tube: approved products
Only those products that do not react with oil and metalare suitable for washing the capillary are those that do not leave sediment and completely evaporate. Here are proven options:
| Medicine | Advantages | Disadvantages | How to use |
|---|---|---|---|
| P-6 (freon) | Original refrigerant, compatible with the system, does not require additional flushing. | Dear, you need a cylinder and a pressure gauge. Requires experience working with freon. | Press under pressure of 6-8 atm through the manifold. |
| Isopropyl alcohol (99%) | Dissolves oil deposits well, evaporates without a residue. | Does not remove mechanical particles (chips, scale). | Pass through the tube with a syringe or compressor. |
| Acetone (technical) | Effective against tar deposits, cheap and accessible. | Aggressive to some plastics and rubber seals. | Use in a mixture with oil (1:10), rinse quickly. |
| Special flushes (for example, Frigcold Flush) | Developed for refrigeration equipment, safe for the system. | High price, difficult to find in retail sale. | Follow the instructions on the packaging (usually pressed under pressure). |
Do not use water, gasoline, kerosene or household detergents under any circumstances (for example, Fairy or Mole)! They leave moisture, which will later freeze and form ice plugs, or corrode the metal of the tubes.
Step-by-step instructions: how to rinse a capillary tube
Before starting work, prepare the tools:
- 🔧 Set of wrenches (for disconnecting the tubes).
- 🩹 Rubber gloves and safety glasses (freon and solvents are toxic!).
- 💉 Large volume syringe (50-100 ml) or compressor with a pressure gauge.
- 🧴 Selected cleaning agent (see table above).
- 🔥 Blowtorch or hair dryer (to warm up the tube).
Next follow the algorithm:
- Disconnect refrigerator from the network and defrost it (at least 12 hours).
- Drain the freon from the system (if you are not confident in your abilities, entrust this to a specialist!). To do this:
- Take a bite filler tube side cutters of the compressor.
- Connect a hose to it and release the gas in a well-ventilated area (for example, on a balcony).
- For liquid solvents (alcohol, acetone): draw into a syringe and push through the tube 3-5 times.
- For freon: connect the cylinder through a pressure gauge and blow under pressure 6-8 atm.
- Warm the tube with a hairdryer or blowtorch (up to 60-80°C) - this will help remove residues moisture.
- Blow with compressed air (for example, from a car compressor) to remove particles.
- Install a new filter-drier (the old one is ineffective after washing!).
- Fill the system with freon (only if you have experience! Filling errors lead to compressor failure).
☑️ Preparation for washing the capillary
⚠️ Attention: If after flushing the refrigerator does not work, the blockage may not be cleared or the tube is damaged. In this case, the capillary will need to be replaced or diagnostics of the compressor.
Frequent errors when flushing and how to fix them avoid
Even experienced craftsmen sometimes make mistakes that lead to repeated breakdowns. Here's what you shouldn't do:
- 🚫 Use water or soap solutions —they cause corrosion and ice jams.
- 🚫 Warm the tube with an open flame (for example, with a gas burner) - this is can melt copper.
- 🚫 Rinse the tube without replacing the filter-drier —the old filter will not retain new particles.
- 🚫 Fill the system with unsuitable freon (for example, R-22 instead R-134a).
- 🚫 Leaving air in the system after flushing - this worsens heat transfer.
The most common mistake is insufficient drying of the tubeIf moisture remains in the system, it will freeze in the capillary and block the flow of freon. To avoid this:
- Blow out the tube warm air (from a hair dryer) for at least 10 minutes.
- Use silica gel packages - place them next to the open end of the tube for 1-2 hours.
When flushing does not help: alternative solutions
If the capillary tube is clogged mechanically (for example, with pieces of metal or scale), flushing may not help. In such cases, consider:
- 🔄 Replacement of the capillary tube - a radical but reliable method. Requires soldering and refilling of freon.
- 🛠️ Installation of a bypass bypass is a temporary solution when the tube is cleaned without removing (suitable for partial blockages).
- 🔧 Replacement of the compressor —if the blockage has led to its wear (for example, due to dry operation).
The cost of replacing the capillary in the service is from 3,000 to 8,000 rubles (depending on the model of the refrigerator). If the refrigerator is older than 10 years, it is sometimes cheaper to buy a new one than to repair the old one.
How do you understand that the tube needs to be changed and not washed?
If after 2-3 flushes the blockage returns, or mechanical damage is found in the tube (cracks, dents), it is replaced. You will also have to change the capillary if it was deformed when trying to clean it (for example, when using wire).
Prevention of blockages: how to extend the life of the capillary tube
To avoid repeated blockages, follow these rules:
- 🕒 Defrosting the refrigerator every 6 months (even if the model c No Frost).
- 🛡️ Protection against voltage surges —use a stabilizer so that the compressor does not work for wear.
- 🔋 Oil level control in the compressor (when filling freon, add oil of the same brand).
- 🌡️ Do not overload the refrigerator —excess food impairs air circulation and leads to overheating.
Pay special attention quality of freon and oilimpurities that accelerate the formation of deposits. Buy refrigerant only from trusted suppliers (for example, freon and oil quality. If your refrigerator runs on freon (isobutane), never use acetone or alcohol based on it for flushing! This refrigerant explosive when in contact with solvents. DuPont, Honeywell).
⚠️ Attention: If your refrigerator runs on freon R-600a (isobutane), never use acetone or alcohol based on it for cleaning! This refrigerant is explosive when in contact with solvents.
FAQ: Frequently asked questions about flushing the capillary tube
Is it possible to flush the capillary tube without draining the freon?
Theoretically yes, but this is risky. Freon is under pressure, and when the tube is disconnected, it can escape with force, causing burns. Moreover, without draining the freon, it is impossible to thoroughly flush the system - the solvent will mix with the refrigerant and will not remove the blockage.
How long does flushing take?
On average, 2-4 hours, if done. everything is neat. Most of the time is spent on defrosting (12+ hours), draining the freon (30-60 minutes) and drying the tube (20-40 minutes). The washing itself takes 10-15 minutes.
How to rinse the capillary in the refrigerator Atlant or Indesit?
The same means are suitable for these models: freon R-134a (for modern refrigerators) or R-600a (for old ones), isopropyl alcohol or special flushes. The main thing is to check the compatibility of freon with. oil in the compressor (indicated on the nameplate).
Can WD-40 be used for flushing?
No! WD-40 leaves an oil film that later hardens and forms a new blockage. In addition, it is not compatible with freon and can damage the seals.
How often do you need to flush the capillary tube?
Normally, flushing is only required when there is a blockage. If the refrigerator operates stably and the temperature is stable. is kept at the required level, there is no need to interfere with the system. Preventive flushing can cause more harm than good.