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• 396.

  What is the refrigeration system in a car?

  The refrigeration system in a car is part of the vehicle's air conditioning (AC) system, and its primary function is to cool and dehumidify the air in the passenger compartment.
  Key components of automotive refrigeration systems include:
  ① Compressor: The compressor is a key component for pressurizing and circulating refrigerant in the system. It is usually driven by the engine's accessory belt. The compression of the refrigerant causes it to become hot and highly pressurized.
  ② Condenser: The hot, high-pressure refrigerant flows to the condenser, which is usually located in front of the vehicle's radiator. Here, the refrigerant releases heat into the surrounding air, causing it to condense into a high-pressure liquid.
  ③ Expansion valve or orifice tube: After leaving the condenser, the high-pressure liquid refrigerant passes through the expansion valve or orifice tube. This component reduces the pressure of the refrigerant, causing it to expand rapidly. As a result, the refrigerant turns into a low-pressure, low-temperature mist.
  ④ Evaporator: The low-pressure, low-temperature refrigerant then enters the evaporator, usually located within the car dashboard. Air from the passenger compartment blows over the evaporator coil, causing the refrigerant to absorb heat from the air. This process causes cool air to be blown inside.
  ⑤ Blower: The blower circulates air over the evaporator coil and into the passenger compartment, providing cooling air.
  ⑥ Refrigerant: Refrigerant is a substance that circulates in a system, absorbing and releasing heat as it changes from gas to liquid and back again.
  
  Refrigeration systems operate in a closed loop, with refrigerant constantly circulating through these components. Proper maintenance, including checking refrigerant levels and fixing any leaks or malfunctions, is crucial to keeping your car's air conditioning system running efficiently.
  
• 397.

  How does a car act when it needs transmission fluid?

  When your car requires transmission fluid or the transmission fluid level is low, a variety of symptoms may occur.
  It is important to address low transmission fluid issues promptly to avoid potential damage to the transmission. Here are some common signs your car may need transmission fluid:
  ① Gear slipping: Low transmission fluid level will make it difficult for the transmission to maintain the necessary hydraulic pressure. This can cause the transmission to slip in and out of gears, resulting in a noticeable lack of power and acceleration.
  ② Delayed or rough shifting: Insufficient oil can cause delayed or rough shifting between gears. You may experience hesitation or judder when the transmission shifts gears, which is a sign that the fluid is not providing smooth engagement.
  
  ③ Abnormal noise: Low transmission oil level will cause increased friction and heat in the transmission. This can cause premature wear of components and produce unusual noises, such as whining, clunking, or grinding sounds.
  ④ Overheating: Insufficient transmission oil can cause the transmission to overheat. Transmission overheating can cause serious damage and should be addressed immediately. Some vehicles have a temperature warning light that may come on if the transmission is too hot.
  
  ⑤ Transmission warning light: Modern vehicles usually have a transmission warning light on the dashboard. If this light comes on, it may indicate a low fluid level or other transmission issue. Refer to your vehicle's owner's manual for guidance on interpreting the warning lights.
  ⑥ Fluid leakage: If you notice red or brown fluid under your car, this may be a sign of a transmission fluid leak. Leaks may cause low fluid levels and should be addressed immediately. Transmission fluid is usually red or brown in color and has a distinct odor.
  
  If you suspect your car needs transmission fluid, be sure to check the fluid level with a dipstick (if your vehicle has one) and consult your vehicle's owner's manual for the correct type of transmission fluid to use.
  

  
  
• 398.

  What happens if you put ATF in a CVT transmission?

  Automatic transmission fluid (ATF) is not recommended for use in continuously variable transmissions (CVT). CVTs use a specialized type of transmission fluid designed to meet the unique requirements of the CVT system.  CVTs work differently than traditional automatic transmissions in that they require specific fluids to ensure proper operation and longevity.
  If you incorrectly use ATF in a CVT, several issues may arise:
  ① Incompatibility: CVT requires a specific type of transmission fluid and additives designed to work with the pulley and belt systems used in CVT transmissions. ATF may not have the right additives for the CVT, which may result in poor performance and potential damage.
  
  ② Fluid Failure: CVT fluid is formulated to withstand the unique stresses and heat generated by the constant changes in CVT gear ratios. Using ATF may cause premature failure of the fluid, reducing its effectiveness and possibly causing damage to the transmission.
  
  ③ Slippage and shudder: Incompatible transmission fluid may cause slippage or shudder during acceleration, resulting in a significant decrease in performance and drivability.
  ④ Overheating: CVT oil is designed to operate within a specific temperature range. Using the wrong fluid can cause overheating, which can further lead to premature wear and potential transmission failure.
  
  If you accidentally add ATF to your CVT, it's critical to address the situation promptly. The best course of action is to drain the incorrect fluid and replace it with the recommended CVT fluid as soon as possible. Additionally, have the CVT inspected by a qualified mechanic to assess whether any damage has occurred and to ensure the transmission is functioning properly.
  
• 399.

  How often should you clean your transmission?

  The frequency of transmission cleaning or maintenance depends on a variety of factors, including transmission type, driving conditions and manufacturer's recommendations. In general, the following guidelines can be considered:
  ① Automatic transmission fluid (ATF) replacement:
  Normal driving conditions: Many manufacturers recommend replacing the ATF every 30,000 to 60,000 miles (48,000 to 96,000 kilometers) under normal driving conditions. However, it is necessary to check the vehicle's specific maintenance schedule in the owner's manual, as recommendations may vary.
  Harsh driving conditions: If you frequently drive in harsh conditions such as heavy traffic, tow trucks, or extreme temperatures, you may need to replace your ATF more frequently. Some manufacturers recommend replacing the ATF every 15,000 to 30,000 miles (24,000 to 48,000 kilometers) under severe conditions.
  
  ② Manual transmission maintenance:
  Frequency: Manual transmissions generally require less frequent maintenance than automatic transmissions. However, the manufacturer's recommendations must be followed for checking and changing transmission fluids.
  Driving Conditions: Harsh driving conditions may also require more frequent maintenance on your manual transmission.
  
  ③ Transmission filter replacement:
  Some automatic transmissions come with filters that should be replaced regularly. Check the manufacturer's recommendations for specific intervals, often associated with ATF replacement.
  
  ④ Gearbox flushing:
  Some manufacturers recommend a transmission flush, which involves replacing most of the ATF and cleaning the transmission system more thoroughly. The frequency of transmission refreshes can vary, but is typically less frequent than regular ATF replacements.
  
• 400.

  Can I put ATF in my gas tank?

  It is not recommended to pour automatic transmission fluid (ATF) directly into the tank. ATF is designed specifically for use with automatic transmissions and has features suitable for functioning in this environment.Adding ATF to the fuel tank may adversely affect the vehicle's engine and fuel system. Here’s why:
  ① Combustion problem: ATF is not suitable for combustion in engines. Introducing ATF into the fuel system can result in incomplete combustion, increased exhaust emissions, and potential damage to engine components.
  ② Fuel system damage: ATF may be incompatible with seals, gaskets and other components in the fuel system. It can damage these parts and cause leaks or other problems.
  ③ Engine performance: ATF does not have the same characteristics as gasoline or diesel. Using it as a fuel additive can negatively impact engine performance, fuel efficiency, and overall drivability.
  
  If you wish to improve fuel system cleanliness or resolve issues related to fuel deposits, it is recommended to use a fuel system cleaner or additive specifically designed for gasoline or diesel engines. These products are designed to clean fuel injectors, remove deposits and enhance fuel system performance without causing damage to the engine.