How many kilometers do commercial vehicles need to be scrapped?

What Causes Difficult Cold Starts in Cars?

Difficult cold starts in cars can be attributed to the following reasons: 1. Faulty fuel pressure regulator: The fuel pressure in the fuel system directly affects the air-fuel mixture concentration. If the vehicle is hard to start, the fuel pressure should be checked first, and the fault location can be determined by inspecting the fuel pressure regulator. 2. Coolant temperature too low: When the coolant temperature is too low, the engine control unit (ECU) will increase the fuel injection volume based on the signal from the temperature sensor, commonly referred to as enriched starting. Due to the temperature, starting can also be difficult at this time. Therefore, it is necessary to replace the antifreeze timely according to climate changes. 3. Excessive carbon deposits: When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold start injector will be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making it difficult to start. Only when the carbon deposits are saturated with absorbed gasoline does the engine start more easily. 4. Faulty fuel injector: Injector faults are mostly evident in cold conditions. Especially in winter, the lower the engine temperature during a cold start, the greater the required increase in gasoline injection. This is mainly because, during low-temperature starts, gasoline vaporization near the intake valve and cylinder wall is poor, and some gasoline cannot fully evaporate and burn, leading to an overly lean air-fuel mixture in the cylinder. This results in difficult cold starts, unstable idling, and stalling. Once the engine warms up, these symptoms disappear.

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Is the AC Switch for Heating or Cooling?

AC button is the cooling switch of the car air conditioning. After pressing the AC button, the car air conditioning will cool, so AC is for cold air. Related introduction about car air conditioning cooling is as follows: 1. After pressing the AC button, the compressor clutch will engage, and the engine will drive the compressor to operate. This allows the compressor to continuously compress the refrigerant and deliver it to the evaporator. 2. The AC button is the switch for the cold air conditioning. When pressed, the compressor works while the temperature control knob is adjusted to the cooling zone, and the blower is turned on (1, 2, 3, 4 gears). At this time, cold air will blow out. For heating, there is no need to press the AC button. 3. The AUTO mode is a unique function of the car's automatic air conditioning. It automatically selects whether to use cold or hot air based on the set interior temperature. However, the AC button does not need to be activated when cooling is not required, aiming to prevent the compressor from working unnecessarily to save fuel.

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What to Do About Coolant Leak?

Coolant leakage requires checking whether the coolant radiator is malfunctioning, whether the car's heater core is damaged, and whether the coolant hose connections are aged, and timely repair and replacement should be carried out. Here is an introduction to coolant: 1. The engine coolant is an important substance for cooling the car. 2. Coolant has antifreeze properties, preventing the radiator from cracking due to the coolant freezing. 3. The car needs to have its coolant replaced once a year. Coolant protects the engine cooling system from corrosion, effectively prevents the formation of dirt, prevents the car radiator from overheating, and provides long-term comprehensive protection for the radiator.

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Where are the front side airbags located?

Front side airbags are located on the outer side of the front seats, near the windows. Here is an introduction about car airbags: 1. Car side airbags are safety airbags installed on the outer side of the car seats. Their function is to deploy when the vehicle is subjected to a side impact, protecting the passenger's side and reducing the injuries caused by the impact. 2. Side airbags are further divided into front side airbags and rear side airbags. Both front and rear side airbags are arranged on the side of the car seats near the windows. Generally, there are seven sensors in the car. When the sensors detect a side impact, they will automatically deploy to protect the safety of the driver or the front passenger. 3. The airbag is a passive safety device, and its protective effect has been widely recognized. The first patent related to airbags dates back to 1958. After entering the new century, airbags have become common in cars. Studies show that in frontal collisions, the mortality rate of drivers in cars equipped with airbags is reduced by 30% in large cars, 11% in medium-sized cars, and 20% in small cars.

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What are the causes of coolant leakage?

The causes of coolant leakage include: leakage from the radiator water pump leading to antifreeze leakage; and damaged hose clamps causing antifreeze leakage. The specific cause needs to be promptly inspected and repaired at a maintenance facility. Here is an introduction about coolant: 1. The full name of coolant should be antifreeze coolant, indicating that it is a coolant with antifreeze functionality. 2. Antifreeze can prevent the coolant from freezing during cold winter parking, which could lead to radiator expansion cracks and engine cylinder block freezing damage. 3. However, antifreeze is not only used in winter; it should be used all year round. 4. When replacing new antifreeze, it is essential to bleed the system.

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Does the Transmission Have a Filter?

The transmission does have a filter. Also known as a transmission screen, it is installed inside the transmission to serve a filtering function, removing contaminants and impurities from the transmission fluid, thereby protecting the transmission. Here are some details about the transmission filter: 1. The filter is typically replaced along with the transmission fluid, usually every two years or after driving approximately 40,000-60,000 kilometers. 2. However, there is no fixed replacement interval—it depends on usage. Most filters are made of filter paper, which can accumulate many impurities over time and require timely replacement. Some vehicle models use a metal mesh filter with a fine wire mesh layer. This type of filter can be removed, cleaned, and reused during transmission fluid changes, eliminating the need for replacement. 3. Over prolonged use, friction between metal components in the transmission generates fine debris, and the transmission fluid also accumulates contaminants. These impurities are intercepted and filtered by the transmission screen to prevent transmission malfunctions. However, over time, these impurities build up in the filter, leading to clogging and reduced filtration efficiency. This can also accelerate transmission wear and significantly shorten its lifespan. Therefore, it is important to regularly inspect the filter's condition and replace it when necessary.

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How many kilometers do commercial vehicles need to be scrapped?

What Causes Difficult Cold Starts in Cars?

Is the AC Switch for Heating or Cooling?

What to Do About Coolant Leak?

Where are the front side airbags located?

What are the causes of coolant leakage?

Does the Transmission Have a Filter?

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