What are the reasons for the car air conditioner not cooling after prolonged use?

Can You Make a U-Turn Over a Single Yellow Line in the Middle of the Road?

If it is a single yellow dashed line, you can make a U-turn when it does not affect the normal flow of traffic. However, if it is a single yellow solid line, making a U-turn is not allowed and is considered a traffic violation. According to the "Road Traffic Safety Law," violators will be fined 200 yuan and receive 3 demerit points. Generally, on long stretches of road, there are usually white solid lines, dashed lines, or yellow solid or dashed lines in the middle section or before intersections. As long as the line is solid, U-turns are prohibited. Scenarios where U-turns are allowed: Intersections with U-turn signs: If there is a clear U-turn sign at the intersection, you can make a U-turn. If there is a U-turn traffic light, you must follow its instructions. If there is no traffic light, you should assess the situation and make the U-turn without obstructing other vehicles or pedestrians. Intersections without explicit "No U-turn" or "No Left Turn" signs: If there is no explicit prohibition, U-turns are allowed. "No explicit prohibition" means the intersection lacks signs like "No U-turn," "No Left Turn," or a solid center line. In such cases, you can safely make a U-turn. Yellow grid lines also allow U-turns: Yellow grid lines are no-parking zones, typically marked at intersections prone to congestion due to temporary stops, important facility entrances, or other designated areas. Stopping on these lines (including waiting at traffic lights) is a violation. Although parking is prohibited in yellow grid zones, U-turns are allowed as long as there is no central barrier. A yellow grid line without a barrier is equivalent to "U-turn permitted." When "No Left Turn" and "U-turn Permitted" signs coexist: U-turns are allowed, but left turns are prohibited. Note that "No U-turn" is not the same as "No Left Turn." Things to note when making a U-turn at an intersection: Observe road markings: If the line is solid, U-turns are prohibited under any circumstances. Continue driving to find a suitable spot. If there is a "No Left Turn" sign, even if "No U-turn" is not mentioned, U-turns are still prohibited at that intersection because the actions of left turns and U-turns are closely related—a U-turn requires a left turn first. U-turns must be made from the innermost left-turn lane. If you are in the second left-turn lane, you cannot make a U-turn at that intersection. Always yield to through traffic when making a U-turn. If you interfere with the normal flow of through traffic, you will bear full responsibility for any accidents. Near the intersection stop line, lanes usually have guiding arrows for drivers to choose their direction. The leftmost lane may not always have a left-turn arrow. On some roads, if there is a straight arrow, U-turns are prohibited even if there are no explicit "No U-turn" signs. Making a U-turn on a crosswalk is also a traffic violation.

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How to Determine the Position of Car Tires?

Look straight ahead from the center point of the steering wheel towards the left. If you feel that the left corner of your car is pressing against the inner edge of the left line, it means the car is within the lane and at a safe boundary. If you feel it's pressing against the outer edge of the left line, then your car should be pressing against the inner edge of the left line, and you need to be cautious at this point. Alternatively, you can choose a fixed object on the window, such as the wiper, and practice on an empty road to see which part of the wiper corresponds to the position of the right tire. After a few tries, you'll get the hang of it. Place a pole near the front bumper of the right tire. From your position, observe which part of the wiper can pass. When the driver maintains a proper sitting posture and looks straight ahead, if the left lane extension line is about 10 cm away from the left side of the windshield, then the left tire is approximately 60 cm away from the left lane line. Generally, to keep the car safely centered in the lane, we only need to judge one side, since both sides of a lane are marked. It's more recommended to focus on the left side, as the driver's seat is on the left.

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What is the Difference Between 93 Octane and 92 Octane Gasoline?

The differences between 93 octane and 92 octane gasoline include octane rating and anti-knock performance. Specific details are as follows: Difference in Octane Rating: 93 octane gasoline has an octane rating of 93, while 92 octane gasoline has an octane rating of 92. The octane rating of 93 octane gasoline is higher than that of 92 octane. Difference in Anti-Knock Performance: Anti-knock performance is determined by the content of "isooctane." The higher the content, the better the anti-knock performance. 93 octane gasoline contains 93% isooctane, while 92 octane gasoline contains 92% isooctane. Therefore, 93 octane gasoline has better anti-knock performance than 92 octane. Difference in Pollution Levels: Compared to 93 octane, 92 octane has reduced anti-knock properties, but it contains lower levels of other substances such as sulfur, benzene, aromatic hydrocarbons, and manganese, making it more environmentally friendly. Difference in Practical Use: 93 octane gasoline complies with the China IV emission standard, while the China V standard replaced it with 92 octane gasoline. In practical use, there is little difference between the two, and both are suitable for mid-range vehicles.

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What Causes the Abnormal Noise When Shifting to Reverse Gear in an Automatic Transmission?

The abnormal noise when shifting to reverse gear in an automatic transmission could be caused by several factors, including the electronic linkage between the brake system and the automatic transmission, idling gear shifting, the absence of a synchronizer in the reverse gear, or shifting gears without coming to a complete stop. 1. Electronic linkage between the brake system and the automatic transmission: If the clutch is not fully depressed during gear shifting, it can lead to gear damage. Additionally, resting your foot on the clutch when not in use can cause excessive wear on the release bearing. 2. Idling gear shifting: In automatic transmission vehicles, the engine speed is very high during the first few seconds after starting. Shifting from neutral to reverse before the engine speed stabilizes can cause strong impact vibrations, damaging the gear shift switch inside the transmission. The correct practice is to wait for the RPM displayed on the dashboard to stabilize before using the reverse gear. 3. Reverse gear lacks a synchronizer: A synchronizer is an internal device in the transmission that ensures smooth gear engagement during shifting. Some vehicles do not have synchronizers, making gear shifting more difficult. Moreover, to distinguish it from forward gears, most vehicle transmissions do not have a synchronizer for the reverse gear. This is why shifting to reverse is harder than other gears and sometimes results in abnormal noises. 4. Shifting gears without stopping completely: When parking, it is standard practice to come to a complete stop before shifting the gear lever from D to P. If the vehicle is not fully stopped before shifting to P, the internal P gear lock hook will strike the gear, producing a clunking sound. This operation can wear or even break the lock hook, potentially leading to severe transmission damage.

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Where to Deal with Car Scratches?

When dealing with car scratches, the method and location for treatment should be chosen based on the severity of the scratch. Below is a detailed introduction and solutions: 1. Light scratches: For light scratches, all you need is a tube of toothpaste. Toothpaste is highly effective for shallow scratches that haven't damaged the car's primer. It can especially remove traces left by other vehicles' paint during minor collisions or sticky residues from adhesive products, cleaning most of them thoroughly. 2. Moderate to deep scratches: Moderate and deep scratches cannot be repaired by polishing. For small dents not exceeding 5mm, they can be leveled with filler putty before repainting. 3. Deep scratches: Such damage is usually difficult to repair perfectly on your own and requires professional treatment at a 4S shop or quick repair shop. In such cases, metalworking is needed followed by repainting.

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Is It Illegal to Install a Rear Spoiler on a Car?

Installing a rear spoiler is considered illegal and falls under unauthorized vehicle modifications. Below is an introduction regarding illegal modifications: Penalties for Illegal Modifications: Driving a vehicle with illegal modifications on public roads will result in the vehicle being impounded by traffic authorities, the illegal modifications confiscated, and the owner required to restore the vehicle to its original condition. Additionally, fines will be imposed according to the law. Regulations on Illegal Modifications: For vehicles with illegal modifications, traffic authorities will not issue a safety inspection certificate. If the modifications constitute a violation of public security management laws, the public security authorities may impose fines or detention in accordance with the "Public Security Administration Punishment Law." When modifying your vehicle, it is essential to apply for a modification registration with the traffic management department of the public security authorities to ensure the vehicle can pass annual inspections and routine safety checks after modifications.

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What are the reasons for the car air conditioner not cooling after prolonged use?

Can You Make a U-Turn Over a Single Yellow Line in the Middle of the Road?

How to Determine the Position of Car Tires?

What is the Difference Between 93 Octane and 92 Octane Gasoline?

What Causes the Abnormal Noise When Shifting to Reverse Gear in an Automatic Transmission?

Where to Deal with Car Scratches?

Is It Illegal to Install a Rear Spoiler on a Car?

How to Escape When a Car Falls into Water?

How is the purchase tax on imported vehicles collected?

At What RPM Should You Shift Gears in a Manual Transmission?

What are the four mandatory insurances for vehicles?