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• 326.

  What lubricates the refrigeration compressor?

  In refrigeration systems, including automotive air conditioning systems, the compressor is lubricated by a specific type of oil called refrigeration oil or compressor oil. This oil has several key functions:
  ① Lubrication: The main function of refrigeration oil is to lubricate the moving parts of the compressor. Compressors contain various moving parts such as pistons, bearings and shafts that require lubrication to reduce friction and wear.
  ② Sealing: Refrigerant oil helps form a seal between the moving parts of the compressor, preventing refrigerant and gas from leaking out of the system.
  ③ Heat dissipation: Refrigeration oil also helps dissipate the heat generated during the compression process. This helps prevent the compressor from overheating and ensures optimal performance.
  The refrigerant oil used in automotive air conditioning systems is specially formulated to withstand the operating conditions within the system, including extreme temperatures, pressure changes and exposure to refrigerants. Different types of compressors and refrigerants may require different types or viscosities of refrigeration oil, so the correct oil specified by the manufacturer must be used when servicing or replacing a compressor.
  
• 327.

  What happens when refrigerant is overcharged?

  When an air conditioning system is overcharged with refrigerant, several potential problems may arise:
  ① High pressure: Excessive charging of refrigerant in the system will increase the pressure in the air conditioning system. Excessive pressure can strain and damage various components, including the compressor, hoses and seals. High pressure can also cause system leaks.
  ② Reduced cooling efficiency: An overcharged system will lead to reduced cooling efficiency. Excessive refrigerant can interfere with the normal operation of the system and affect its ability to absorb and dissipate heat efficiently. This results in insufficient cooling performance and discomfort for the occupants.
  ③ Compressor damage: Compressors are particularly susceptible to damage due to overcharging. Excessive pressure can cause the compressor to work harder than intended, leading to overheating and mechanical failure. Over time, this can lead to expensive repairs or compressor replacement.
  ④ Oil dilution: Refrigerant circulates with oil in the air conditioning system, helping to lubricate the compressor and other moving parts. When a system is filled with too much refrigerant, it dilutes the oil and reduces its lubrication properties. Insufficient lubrication causes increased friction and wear on compressor components, potentially leading to premature failure.
  ⑤ System failure: Overcharging the system may cause unstable system behavior and failure. This could include issues such as uneven cooling, frequent switching on and off, or overall system failure. These problems can affect comfort and safety while driving and may require professional diagnosis and repair.
  
  In summary, overcharging your air conditioning system with refrigerant can cause a host of problems, including increased pressure, reduced cooling efficiency, compressor damage, oil dilution, and system failure. It is important to ensure that the correct amount of refrigerant is charged into the system according to the manufacturer's specifications to prevent these problems and ensure optimal performance and longevity of the air conditioning system.
  
• 328.

  Should I replace condenser with compressor?

  Whether the condenser is replaced along with the compressor during air conditioning system repairs depends on several factors:
  ① Condition of the condenser: If the condenser is damaged, corroded or leaking, replacing it with the compressor is recommended. A damaged condenser can affect the performance and efficiency of your air conditioning system and may cause your new compressor to fail prematurely.
  ② System contamination: If an old compressor fails due to internal damage or contamination, debris or contaminants may circulate throughout the air conditioning system, including the condenser. In this case, it is recommended to replace the condenser to prevent contamination of the new compressor and ensure proper operation of the system.
  ③ System life and mileage: In older vehicles with higher mileage, it may be wise to replace the condenser and compressor as a precautionary measure. This helps ensure the overall reliability and longevity of your AC system, especially if other components show signs of wear or deterioration.
  ④ Cost considerations: Replacing the condenser and compressor will increase the overall cost of air conditioning system service. However, it is important to weigh the cost of replacement against the potential benefits in improved system performance, reliability and longevity.
  Ultimately, the decision to replace the condenser and compressor should be based on a thorough inspection of the air conditioning system, including consideration of its condition, age, and any potential contamination issues. Qualified automotive technicians can provide expert advice and guidance based on your vehicle's specific conditions.
  
• 329.

  What to replace when replacing AC compressor?

  When replacing the AC compressor in a vehicle's air conditioning system, it is often recommended to replace several other components at the same time to ensure optimal performance, reliability, and longevity of the system. Here are some components that are commonly replaced with the compressor:
  ① Receiver/dryer or accumulator: This component is responsible for removing moisture and debris from the refrigerant. Over time, it can become saturated with moisture and contaminants, reducing its effectiveness. It is recommended to replace the receiver/dryer or accumulator whenever the air conditioning system is opened to replace the compressor.
  ② Expansion valve or orifice tube: These components regulate the flow of refrigerant into the evaporator core. Over time, they can become clogged or damaged, causing the air conditioner to perform poorly. Replacing the expansion valve or orifice tube ensures refrigerant flow and proper system operation.
  ③ O-rings and seals: O-rings and seals are used to establish airtight connections between AC system components. Over time, they can deteriorate and develop leaks, especially when the system is opened to replace the compressor. These seals must be replaced to prevent refrigerant leaks and ensure proper system operation.
  ④ Refrigerant oil: Refrigerant oil lubricates the moving parts of the compressor and helps seal internal components. When replacing a compressor, it is important to drain the compressor and refill it with the correct type and amount of refrigeration oil to ensure proper lubrication and longevity of the compressor.
  ⑤ System flushing: Flushing the air conditioning system will help remove any debris, contaminants or old refrigeration oil remaining in the system after a compressor failure. This step is critical to prevent contamination of the new compressor and ensure proper system performance.
  ⑥ Pressure switch or sensor: A pressure switch or sensor monitors the pressure levels in the air conditioning system and helps prevent compressor damage due to over- or under-pressure conditions. If these switches or sensors are damaged or malfunctioning, it is recommended to inspect and replace them.
  ⑦ Refrigerant: Finally, after replacing the compressor, the air conditioning system needs to be replenished with the correct type and amount of refrigerant according to the manufacturer's specifications.
  
• 330.

  Why is it necessary to do vacuuming before recharging system?

  Vacuuming before recharging an air conditioning system in a vehicle is necessary for several reasons:
  ① Moisture Removal: Vacuuming helps remove any moisture present in the system. Moisture can be harmful as it can react with refrigerant to form acids, which can corrode components and cause damage to the system.
  ② Air Removal: Vacuuming removes air from the system. Air can cause inefficiencies in the system's operation, as it occupies space that should be filled with refrigerant. Air can also lead to poor cooling performance and can contribute to compressor damage.
  ③ Refrigerant Purity: Vacuuming ensures that the refrigerant in the system is of high purity. Any contaminants or non-condensable gases present in the system can affect its performance and efficiency.
  ④ System Efficiency: A properly vacuumed system allows for better refrigerant flow and heat exchange, leading to improved cooling performance and overall system efficiency.
  Overall, vacuuming before recharging the system is a crucial step in maintaining the performance and longevity of the vehicle's air conditioning system.