With the onset of hot days, the serviceability of the air conditioning system becomes critical for the comfort of the driver and passengers, but few people think about the state of the air condition. draineruntil he has seen the clear signs of his refusal. This component, often called a receiver, has a dual function: it traps solid particles and removes moisture from the refrigerant, preventing ice stoppers and corrosion inside the circuit. Ignoring its condition can lead to expensive repairs of the compressor or the entire Freon line.
Verification drainer It doesn’t always require sophisticated equipment, but it does require careful observation of the climate system’s dynamic behavior. If you notice that the air conditioner stopped cooling, began to make noise or works in jerks, it is likely that the problem lies in clogging or saturation with moisture of this unit. In this article, we will discuss professional diagnostic methods that will help you accurately determine the condition of the component without unnecessary costs.
Visual diagnostics and external signs of malfunction
The initial assessment of the condition of the air conditioning system begins with a visual inspection and analysis of the equipment when the engine is running. Often drain-filter It gives itself out before you decide to take temperature or pressure measurements. Listen carefully to the compressor: if it turns on and off too often, it may indicate that the system is rapidly gaining high pressure due to impaired Freon circulation.
Pay special attention to the viewing window (if it is provided by the design of your car), which is usually located on a high-pressure tube. Through it, you can see the state of the refrigerant: the presence of bubbles, foam or muddy oil indicates serious problems. water-rich ceases to cope with absorption, which leads to boiling of freon and the appearance of a characteristic emulsion.
⚠️ Warning: If you see dark, almost black oil or metal shavings through the viewing window, stop using the air conditioner immediately. This is a sign of compressor destruction, and the wear products could completely clog the filter dehumidifier.
It is also worth checking the tubes that are suitable for the receiver. If after a long work one of the tubes in front of the filter is hot, and immediately after it is cold or even covered with frost, this is a sure sign. blockage. Such a sharp change in temperature indicates that the gas passes through a narrowed section, experiencing throttling, which is unacceptable for a serviceable system.
Method of diagnosis with the help of an IR thermometer
The most accurate and affordable way to check the throughput of the filter is to use a contact or infrared thermometer. This method allows you to identify internal blockages without disassembling the system. First, you need to start the engine and turn on the air conditioner at maximum performance, giving the system 10-15 minutes to stabilize the processes.
Direct the thermometer beam to the inlet and outlet tubes drainer. In a serviceable system, the temperature difference between these points should be minimal, as the filter should not create significant flow resistance. If you record a temperature difference of more than 10-15 degrees Celsius, this directly indicates that drainage It prevents the normal flow of Freon.
For maximum accuracy of measurements, pre-wipe the metal tubes from dirt and dust, and also make sure that they do not get direct sunlight, which can distort the readings of the IR thermometer.
It is important to consider that the filter body itself should normally be warm, but not hot. If the case drainer Touching ice or covered with frost in the middle, this indicates local freezing of moisture inside the mesh or silica gel filler. This phenomenon often occurs after a long idle car or when excess moisture enters the circuit.
- 🌡️ Normal operation: the temperature of the entrance and exit differs by no more than 5 ° C.
- ❄️ Sign of blockage: the output tube is much colder than the input or covered with frost.
- 🔥 Overheating: The receiver body is very hot, which indicates high pressure in front of the filter.
- 💧 Condensate: the appearance of moisture on the filter body with the air conditioner running is an alarming signal.
Contour pressure system check
For deeper diagnostics, professionals use a gauge station connected to high and low pressure service ports. This method provides comprehensive information about the state of refrigerant. When connecting pressure gauges and starting the air conditioner, pay attention to the readings of the arrows: in a serviceable system, the pressure of injection and suction should increase and stabilize within certain limits, depending on the ambient temperature.
If The dehumidifier is partially or completely clogged, you will see abnormally high pressure on the high-pressure side (High Side) and, as a result, low or normal pressure on the low-pressure side (Low Side). The compressor will work with overload, trying to push the freon through the resistance, which can lead to its failure. In some cases, pressure at the outlet of the compressor can reach critical values, causing an emergency operation of the safety valve.
Compare your readings with reference values for a specific type of refrigerant (R134a or R1234yf). A sharp jump in pressure immediately after the compressor is turned on, followed by a rapid drop, may indicate that drainage It only lets flow under certain conditions, such as vibration, but quickly clogs again.
☑️ Diagnostics of pressure in the system
Table of symptoms and probable causes
Systematization of signs helps to make the correct diagnosis faster, without losing sight of important details of the behavior of the climate installation. Below is a table linking the observed symptoms to likely problems inside. Dehumidifier receiver.
| Symptoms. | The probable cause is in the filter | Consequences of neglect |
|---|---|---|
| Air conditioner blows warm air | Complete blockage of the Freon Canal | Overheating and compressor jamming |
| Frequent on/off | Partial blockage, pressure surges | Wear of the electromagnetic coupling |
| Noise or whistle in the receiver area | Freon's passage through a narrow hole | Destruction of internal filter elements |
| Frost on the filter body | Freezing moisture inside the sorbent | Corrosion of aluminum system parts |
Analyzing the data of the table, we can conclude that even one of the listed symptoms requires immediate intervention. Violation of filtration Abrasive particles begin to circulate through the system, acting like sandpaper on the precision surfaces of the compressor and expansion valve.
Moisture effect and service life of the component
The main enemy of the air conditioning system is moisture, and it is the filter-dryer He takes the first hit. Inside it is silica gel, which chemically binds water. However, the resource of this substance is not infinite: over time, it is saturated and ceases to work, starting to release the accumulated moisture back into the circuit.
Term of service receiver Usually it is 2-3 years or 60,000 km of mileage, but with frequent system repairs or a debt of a simple car without sealing, it can fail much earlier. If the system was depressurized, the replacement of the filter-dehumidifier is a mandatory procedure, since the old component will no longer be able to provide the necessary dryness of freon.
⚠️ Warning: Trying to “dry” an old filter-dryer with heating or vacuuming without replacing it is pointless. Silica gel has a limited capacity, and after saturation, its structure changes irreversibly.
The presence of moisture in the system leads to the formation of acid when interacting with the oil of the compressor. This acid erodes the insulation of the compressor motor windings and metal surfaces, causing corrosion. Therefore, timely replacement of the dehumidifier is not just keeping the cold, but protecting expensive nodes from destruction.
Why can’t we keep the system open for long?
When in contact with atmospheric air, moisture is absorbed into oil and silica gel very quickly. Even 15 minutes of open systems can reduce the life of a new dehumidifier by 30%.
Replacement and prevention: key points
If the diagnosis confirms a malfunction, the only correct solution is dryer-filter. When installing a new component, it is extremely important to comply with the technology: the plugs from the new filter are removed at the last moment before installation, and the installation itself must pass as quickly as possible to minimize contact with air.
After replacement, the system must be vacuumed for at least 30-40 minutes. This is necessary to remove air and evaporate residual moisture from highways, which is new. drainage They will be delivered in the first hours of work. Poor vacuuming will negate all efforts to replace the filter.
- 🛠️ Use only original filters or quality analogues of proven brands.
- ⏱️ Keep the replacement time interval even if the air conditioning is working normally.
- 🧪 Add the required amount of compressor oil when replacing the nodes.
- 🔍 Always change the sealing rings to new ones when disassembling the joints.
Regular prevention and attention to detail avoid situations where air-conditioning He refuses at the most inopportune moment. Remember that the cost of the filter is not comparable with the price of a new compressor or condenser, so save on this element is strictly not recommended.
A dehumidifier is a consumable, not a perpetual knot. Its scheduled replacement every 2-3 years is 10 times cheaper than repairing a compressor that has suffered from moisture and dirt.
Can I drive with a faulty filter dehumidifier?
Short-term operation is possible, but undesirable. If the filter is simply saturated with moisture, the air conditioner will work worse. However, if the filter is clogged with wear products, the risk of damaging the compressor or expansion valve is very high. It is better to turn off the air conditioner and contact the service.
How often should the filter dryer be changed?
The recommended interval of replacement is every 2-3 years or 60,000 km of mileage. Also, mandatory replacement is required for any depressurization of the air conditioning system, for example, when breaking the radiator or repairing pipes.
Why does the air conditioner not cool after changing the filter?
There may be several reasons: insufficient amount of freon, failure of the compressor, clogged condenser or errors in the vacuuming system. It is also possible that the new filter was defective or installed in violation of the technology.
Should I wash the system when replacing the dehumidifier?
Washing is necessary only if the compressor destruction products (metal shavings, black oil) are found in the system. If the compressor is intact, and only planned consumables change, washing is not required, high-quality vacuuming is enough.