Should refrigerant be added from the high-pressure or low-pressure side in a car?

What Does the Break-in Period of a New Car Mean?

The break-in period of a car refers to the initial driving phase of a new car or after a major overhaul, typically covering 1000 to 1500 kilometers. This is the essential mileage required to ensure that mechanical components fully contact, rub, adapt, and settle. Below are some key considerations during the break-in period: 1. Warm up the car before starting: Wait 5 to 10 seconds after shifting to second gear before starting the vehicle. 2. Avoid high-speed driving: New cars have speed limits during the break-in period, with domestic cars limited to 40 to 70 kilometers per hour and imported cars to 100 kilometers per hour. 3. Avoid overloading: Carrying too much weight in a new car during the break-in period can damage mechanical components. 4. Do not remove the speed limiter prematurely: The speed limiter is a throttle device installed between the carburetor and the intake pipe. Owners should not remove it too early but wait until after driving 1000 kilometers. 5. Do not change the oil too early: The initial oil used in a car is specifically designed for the break-in period, featuring low viscosity, good heat dissipation, and excellent oxidation resistance. 6. Avoid emergency braking: Emergency braking not only shocks the braking system during the break-in period but also increases the impact load on the chassis and engine.

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What Causes the Engine Malfunction Light to Stay On?

There are mainly 7 reasons for the engine malfunction light to illuminate: Sensor failure: The sensors mentioned here include coolant temperature, crankshaft position, air flow, intake air temperature, oxygen sensors, etc. When these sensors are damaged, have poor contact, or signal interruption, the car's ECU cannot accurately obtain engine data, which will trigger the engine malfunction light. Fuel quality issues: If fuel and engine oil are not added as required by the manufacturer, it may cause engine wear and trigger the malfunction light. Poor mixture combustion: Poor mixture combustion can lead to engine carbon deposits or knocking. When detected by the oxygen sensor and reported to the ECU, the malfunction light will illuminate as a warning. Spark plug failure, ignition coil failure, fuel pump failure, and fuel line blockage can all cause poor mixture combustion in the engine. Turbocharging issues: Intake turbocharging pipes and turbochargers can also cause the engine malfunction light to illuminate. The most common issue is turbocharger damage, accompanied by symptoms such as oil leaks, high oil consumption, reduced power, metal noises, and blue or black smoke from the exhaust pipe. Intake issues: If there is a problem with the car's intake, it may cause engine pipe blockage, and in severe cases, trigger the engine malfunction light. A dirty air filter that is not cleaned regularly can lead to intake problems. Exhaust issues: Exhaust faults can also cause the engine malfunction light to illuminate. Rear oxygen sensor, catalytic converter, exhaust camshaft, and bearing failures are all causes of exhaust problems, with the catalytic converter being the most common. Using leaded gasoline, lead or silicon-containing lubricant additives, physical damage to the catalytic converter, or engine fuel system failures can easily cause catalytic converter issues. Anti-theft system failure: If the car's electronic anti-theft system malfunctions or the anti-theft controller does not match the engine electronic controller, the anti-theft system can prevent the engine from operating normally and trigger the malfunction light. If the engine malfunction light is on, follow these steps: First, check if the engine is running normally and if there are any issues like shaking or smoke. If so, avoid restarting the engine. Note: Do not restart the engine if the red warning light is on. If the engine can start, turn it off for 5-10 minutes. Without pressing the brake, press the start button once or turn the key halfway to the "on" position without pressing the clutch. The car will perform a self-check after powering on. Wait 5-10 seconds and observe if the malfunction light on the dashboard turns off. If the light remains on, visit a service center as soon as possible. The service center can use a portable diagnostic tool to read the fault code, identify the issue, and perform targeted repairs.

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What is the maximum interval between Subject 3 and Subject 4?

After passing Subject 3, the examination time for Subject 4 is divided into three scenarios: taking the test directly in the afternoon of the same day; exempt from appointment within 9 days, you can take the Subject 4 test at the designated location with your ID card within 9 days after passing Subject 3; third, appointment after 10 days, whether the appointment is successful depends on the current number of examinees, the priority of students, and temporary arrangements of the test center. Subject 4, also known as the Subject 4 theoretical test or driver's theoretical test, is part of the motor vehicle driver's license assessment. It includes requirements for safe and civilized driving operations, knowledge of safe driving under adverse weather and complex road conditions, emergency handling methods for situations such as tire blowouts, and knowledge of post-traffic accident handling. Subject 4 Examination Notes: Examination Time: The examination lasts 30 minutes, and making 12 mistakes (6 questions) during the answering process will terminate the current examination. Number of Questions: Depending on the type of driver's license being tested, 50 questions are proportionally selected from the corresponding Subject 4 question bank. For car-type licenses, questions are selected from 800, and for large vehicle-type licenses, from 1023, with each question worth 2 points. Question Types: The examination includes single-choice questions (including true/false questions) and multiple-choice questions. The first 45 questions are single-choice, and the last 5 are multiple-choice. The examination also includes animation questions, picture questions, scenario recognition questions, and text description questions. Retake Notes: If Subject 4 is not passed, only Subject 4 needs to be retaken. The driving school will schedule the retake, which is not limited by the number of retakes. Unsuccessful candidates can retake indefinitely, and no retake fee is required for Subject 4. Subject 4 Examination Tips: Strengthen error-prone areas and identify the reasons for mistakes. For marked questions, do not just look at the correct answers and memorize them. Consult regulations, textbooks, or reference books to find out the reasons for errors and understand them. Categorize and summarize test questions, refer to the question bank analysis for classification, and find similar questions: There are many similar questions in the question bank that can easily be confused. These should be taken out for summary and analysis. For example, traffic signs for walking, hiking, pedestrian attention, crosswalks, and crosswalk attention have very similar patterns and can be easily confused. During study, they should be categorized to avoid mistakes. Find memorization techniques: Many questions in the question bank involve numbers, which can be summarized for easier memorization. The driving test consists of 3 subjects: Subject 1, Subject 2, and Subject 3. Subject 3 examination is divided into two parts. Subject 4 is the colloquial term for the Subject 3 safe and civilized driving knowledge test and is not a separate subject. Subject 1 refers to the road traffic safety laws, regulations, and related knowledge test; Subject 2 refers to the field driving skills test; Subject 3 examination refers to the road driving skills and safe and civilized driving knowledge test. The safe and civilized driving knowledge test is conducted after Subject 3.

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How many points will be deducted for a driver violating traffic signals once while driving a motor vehicle?

Driving a motor vehicle in violation of traffic signals will result in a deduction of 6 points. Below is the detailed explanation: Laws and regulations: According to the "Road Traffic Safety Law of the People's Republic of China", the "Implementation Regulations of the Road Traffic Safety Law of the People's Republic of China", and the "Regulations on the Application and Use of Motor Vehicle Driving Licenses" (Ministry of Public Security Order No. 123), driving a motor vehicle in violation of traffic signals will result in a deduction of 6 points and a fine ranging from 150 to 200 yuan. Types of traffic signals violated: This includes motor vehicle traffic signals, non-motor vehicle traffic signals, pedestrian crossing signals, lane signals, directional indicator signals, flashing warning signals, and signals at railway crossings.

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What is the mandatory scrapping period for vehicles?

Non-commercial vehicles and commercial vehicles have different scrapping periods, as detailed below: Scrapping regulations for non-commercial vehicles: For household 5-seat cars and 7-seat SUVs, as well as small and micro non-commercial vehicles, there is no usage period limit. When the normal mileage reaches 600,000 kilometers, the state will guide the scrapping process. In addition to the above vehicles, small and micro non-commercial passenger cars, large non-commercial cars, and wheeled special machinery vehicles also have no usage period limit. Scrapping regulations for common commercial vehicles: Small and micro taxi passenger cars have a scrapping period of 8 years, medium-sized taxi passenger cars have a scrapping period of 10 years, and large taxi passenger cars have a scrapping period of 12 years. Public transport passenger cars have a scrapping period of 13 years, other small and micro commercial passenger cars have a scrapping period of 10 years, and large and medium-sized commercial passenger cars have a scrapping period of 15 years. Micro commercial trucks have a scrapping period of 8 years, while light and large commercial trucks have a scrapping period of 10 years. The vehicle scrapping process is as follows: The vehicle owner applying for scrapping and renewal must fill out and submit the "Application Form for Vehicle Modification, Transfer, Alteration, Suspension, or Scrapping" in duplicate and affix the owner's seal. The registration office will accept the application and issue a "Vehicle Scrapping Notice" for vehicles that have reached the scrapping period. For vehicles that have not reached the scrapping period, the vehicle inspection office will determine if they meet the scrapping standards and issue a "Vehicle Scrapping Notice" if applicable. The vehicle owner can then choose a qualified recycling company to dismantle the vehicle based on the "Notice." The recycling company will dismantle the vehicle and take photos after verifying the "Notice." The engine must be separated from the vehicle, the engine block must be broken, and the frame (chassis) must be cut. The vehicle owner must submit the "Modification Form," "XX Province Vehicle Renewal Technical Appraisal Form," "Scrapped Vehicle Recycling Certificate," and photos of the dismantled vehicle to the vehicle inspection office for verification and signature. The license plates and certificates will be reclaimed, and the application will be submitted for approval to complete the scrapping registration. Special notes: According to Article 30 of the "Motor Vehicle Registration Regulations," if a vehicle is damaged and cannot be driven back to its registered location, the owner may hand over the vehicle for scrapping to a local recycling company. If a commercial vehicle is converted to non-commercial use, it must still be scrapped according to the original commercial vehicle scrapping period. According to Article 43 of the "Motor Vehicle Registration Regulations," after completing a vehicle transfer or deregistration, the original owner may apply to use the original license plate number when registering a newly purchased vehicle. The application must meet the following conditions: (1) submitted within six months after the transfer or deregistration; (2) the owner must have owned the original vehicle for more than three years.

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Does Air Conditioner Water Dripping on a Car Cause Damage?

Air conditioner water dripping on a car does not cause damage. The water from air conditioner drips is mainly condensed water vapor from the air, also known as condensate. Its chemical properties, such as pH level, are the same as the ambient air and are not corrosive, so it will not harm the car's body or interior. The temperature of the outdoor unit's heat exchanger in an air conditioner is generally below 0 degrees Celsius, causing water vapor in the air to condense on the heat exchanger. Over time, this can lead to the formation of ice on the heat exchanger, prompting the air conditioner to automatically activate its defrost function, which melts the ice into dripping water. If a car is parked directly beneath an air conditioner's outdoor unit, it may be exposed to dripping water. While this water does not cause damage to the car, prolonged exposure can leave stains once the water dries. In such cases, the stains can be cleaned by wiping with a wet towel and toothpaste. Normally, air conditioners not only produce water leakage from the outdoor unit during heating but also generate condensate from the indoor unit's evaporator during cooling. This condensate flows out through a drainage pipe and, similar to the condensate from the outdoor unit, does not harm the car's glass or paint.

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Should refrigerant be added from the high-pressure or low-pressure side in a car?

What Does the Break-in Period of a New Car Mean?

What Causes the Engine Malfunction Light to Stay On?

What is the maximum interval between Subject 3 and Subject 4?

How many points will be deducted for a driver violating traffic signals once while driving a motor vehicle?

What is the mandatory scrapping period for vehicles?

Does Air Conditioner Water Dripping on a Car Cause Damage?

Do Ordinary People Need Political Review to Buy Hongqi Cars?

Does Recirculating Air Save More Fuel Than Fresh Air Mode?

How long after car window tinting can ETC be installed?

What is the Shenzhen Small Passenger Car Incremental Quota?