What Causes Refrigerant Leakage at the Automotive Air Conditioning Expansion Valve?

1 Answers
DeMiranda
07/29/25 6:57pm
Here are the specific reasons for refrigerant leakage at the automotive air conditioning expansion valve: 1. Pipeline failure: During the installation of the air conditioning indoor-outdoor unit connecting pipes, if the bending angle of the pipeline is too small, it may cause pipe cracking leading to refrigerant leakage or complete loss of refrigerant. When laying the connecting pipes between the indoor and outdoor units, appropriately increase the bending radius of the pipeline to prevent excessive bending. Any leaking pipes should be promptly repaired by welding or replaced. 2. Leak points in the refrigeration system: When replacing components of the refrigeration system, improper secondary installation of parts may create refrigerant leak points in the pipelines and refrigeration system. Apply a moderately concentrated soapy water solution to the entire refrigeration system pipelines and welded joints for leak detection. The testing conditions require the refrigeration system to be charged with nitrogen or refrigerant. Pay close attention to oil-stained areas on the pipelines, systematically identify all leak points, and perform component repairs or replacements based on the actual situation.
Was this review help?
15
5
Share
More Forum Discussions

How to Take the Subject 4 Test Without an ID Card?

You cannot take the Subject 4 driving test without an ID card. The test requires verification of personal identity information for entry into systems like the driver's license database, so an ID card is mandatory. If you don't have an ID card, you can first apply for a temporary ID card and use it to take the test. The Subject 4 test consists of 50 questions, presented in formats such as case studies, images, and animations. The total score is 100, with a passing mark of 90. Subject 4, also known as the theoretical driving test or driver's theory test, is part of the motor vehicle driver's license assessment. After the implementation of the Ministry of Public Security's Order No. 123, the Subject 3 test was divided into two parts: the road test and an additional safety and civility knowledge test, commonly referred to as "Subject 4," which evaluates "driving ethics." Since this test is conducted after Subject 3, it is colloquially called Subject 4, although officially, there is no such designation. If you fail Subject 4, you do not need to retake the previously passed tests (Subjects 1, 2, and 3). You can schedule a retest on your own without paying additional fees. There are no restrictions on the number of retests, but the driving skills test permit is valid for three years. If the applicant does not complete all tests within this period, the results of any passed subjects will be voided.
4
5
Share

Why is Maybach a yellow license plate vehicle?

Maybach is a yellow license plate vehicle because: models with a body length exceeding 6 meters require yellow license plates. Yellow license plates apply to the following vehicle types: 1. Large automobiles; 2. Trailers; 3. Regular motorcycles and training motorcycles; 4. Vehicles used for agricultural purposes; 5. Ordinary M2 class light passenger vehicles. Maybach was once an ultra-luxury car brand and manufacturer active in Europe, founded by Wilhelm Maybach in Germany. Taking the Maybach S450 as an example, its body dimensions are 5466mm in length, 1899mm in width, and 1497mm in height, with a wheelbase of 3365mm.
11
2
Share

What Causes the Car Speedometer Needle to Stop Moving?

Here is an analysis of the reasons why the car speedometer needle stops moving: 1. Speed Sensor: Most cases are due to a damaged speed sensor. 2. Transmission: The wiring connection at the transmission is broken. 3. Grounding Issue: It is highly likely that there is a problem with the car's grounding. 4. Clip Loosening: The clip connecting the odometer and the transmission is loose. Note: There are two scenarios when the speedometer stops moving—one is when it remains at 0, usually caused by a short circuit; the other is when it stays at the maximum point, commonly referred to by car owners as "pegging the needle," which can be resolved by resetting it.
8
1
Share

What to Do If a China V Vehicle Consumes Too Little Urea?

If a China V vehicle consumes too little urea, it is necessary to check whether the urea nozzle is crystallized and blocked or if the control unit supplies power to the nozzle. It is recommended to conduct a systematic inspection at a maintenance center. Automotive urea, also known as diesel exhaust fluid, is used to reduce nitrogen oxides in vehicle exhaust and is crucial for lowering pollutant emissions from diesel vehicles. The motor vehicle pollutant emission standards are established to implement environmental protection laws, reduce and prevent pollution from vehicle exhaust, protect the ecological environment, and ensure human health. Compared to the China IV standard, the China V standard can reduce nitrogen oxides in vehicles by 25% to 43%, significantly improving environmental efficiency.
16
2
Share

How to Deal with Fog on the Front Windshield?

Methods to remove fog from the windshield are as follows: 1. Proper use of the air conditioning system: The operation method is to park the car, start the air conditioning, turn the temperature adjustment button to the hot air direction, then press the defrost button to dry the windshield fog with the hot air produced by the air conditioning. 2. Use special anti-fog products: Before each use, spray evenly on the window and wipe it clean, forming a transparent protective film on the glass to prevent fog formation. 3. Open the window to allow convection of hot and cold air: If the fog is not heavy, you can open a gap in the windows on both sides, allowing the air inside the car to circulate, and the temperature inside the car will gradually approach the outside temperature, causing the fog to dissipate.
8
2
Share

What does 4v mean for motorcycles?

Motorcycle 4v refers to the number of valves in the engine, where 4v means four valves—two intake valves and two exhaust valves. Introduction to the engine: An engine (Engine) is a machine that can convert other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc. Cylinder arrangement of the engine: Cylinder arrangement, as the name suggests, refers to the arrangement of cylinders in a multi-cylinder internal combustion engine. Simply put, it is the queue form of the cylinders on an engine.
8
3
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.