What to Do When the Car Air Conditioning System Is Not Cooling?

What is the normal driving speed for a sedan?

The normal driving speed for a sedan depends on different situations. In urban areas, it should be between 30-60 kilometers per hour, while on highways, it generally ranges from 80-120 kilometers per hour. In ordinary urban areas, the speed is approximately 60-80 kilometers per hour. Driving in urban areas: Due to heavy traffic and pedestrians, the driving speed should not be too fast. It is generally recommended to maintain a steady speed of around 40 km/h. In special circumstances, the speed can be adjusted according to the actual situation. Driving on highways: Since the road is relatively clear and highways are designed for fast traffic, the driving speed should not be too slow. Therefore, the driving speed should be maintained between 80-120 kilometers per hour. Ordinary urban areas refer to national roads adjacent to urban areas where pedestrian traffic is not heavy. In such areas, the driving speed can be kept between 60-80 kilometers per hour.

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What is the difference between Group IV and Group III oils?

Group IV and Group III oils differ in base oil composition, resistance to degradation, and oil film performance. Difference in base oil composition: Group IV base oils are synthetically produced and outperform Group III full synthetic base oils in overall capabilities. Difference in resistance to degradation: Group IV oils typically enter the degradation phase only after 10,000 kilometers, and the degradation is not very noticeable. In contrast, Group III full synthetic oils begin to degrade at 4,000-5,000 kilometers. Difference in oil film performance: Group IV full synthetic oils have extremely stable oil film performance, maintaining good shear resistance with long molecular chain structures that are difficult to break. Group III full synthetic oils, however, show relatively inferior stability in oil film performance.

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Is the Vehicle Title Obtained at the DMV for a New Car?

Yes, the vehicle title for a new car is obtained at the DMV. Introduction to the New Car Green Book: The Green Book is the registration certificate, which is issued to the owner on the spot by DMV staff at the inspection site when the new car is registered. The so-called Green Book refers to the "Motor Vehicle Registration Certificate," which records the vehicle's registration date and manufacturing date and is kept by the vehicle owner. Conditions for Obtaining the Green Book: You can only get the Green Book if you purchase the car in full. If you finance the car, the Green Book must be mortgaged to the lending bank or company. Once the loan is fully repaid, you need to take the Green Book to the DMV to release the mortgage.

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Is it necessary to replace a damaged rear wheel liner?

It is necessary to replace a damaged rear wheel liner. Effects of a damaged wheel liner: If the wheel liner is damaged, it can cause noticeable noise while driving and may reduce the vehicle's sound insulation performance. Additionally, after the wheel liner is damaged, dirt such as mud, sand, branches, and leaves can easily accumulate on the chassis during driving. Over time, this can have a significant impact on the chassis. If the wheel liner is severely damaged, it may also increase the vehicle's air resistance, leading to higher fuel consumption. Function of the car wheel liner: The wheel liner (fender liner) helps prevent water and mud from entering, and it also prevents gravel and mud kicked up by the wheels from splashing onto the bottom of the vehicle, reducing damage and corrosion to the chassis.

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Is Coating or Crystal Coating Better for New Cars?

Crystal coating is better for new cars. The main differences between the two are: 1. Difference one: Crystal coating forms a solid crystalline layer on the paint surface to protect it, whereas coating and glaze sealing do not form crystals on the paint surface, and their hardness is also lower than that of crystal coating. 2. Difference two: In terms of durability, coating protection lasts about 1 year, while crystal coating can last up to 2 years, offering longer lifespan and more stable performance. 3. Difference three: Crystal coating is more stringent and involves a complex application process in a dust-free environment. The products used in coating, although they can form a layer on the paint surface, do not crystallize or harden. Over time, they react with oxygen in the air, eventually decomposing and being washed away by water.

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Why Do Cars Drip Water in Summer?

It is quite normal for a car's exhaust pipe to drip water, which indicates that the engine is working properly, with complete combustion and good atomization effect. Reasons: The dripping water from the car's exhaust pipe is due to the fact that after the gasoline is completely burned, it produces water and carbon dioxide. Water at high temperatures is in the form of water vapor, which is colorless and transparent. However, when the temperature drops below 100 degrees, the water vapor condenses into water. If the condensed water droplets are very small and suspended in the air, the water vapor appears as white gas. When the ambient temperature is low, the white smoke from the exhaust pipe is water vapor. If the condensed water droplets accumulate, they turn into water. Minimum conditions for exhaust pipe dripping: The mixture ratio of gasoline and air is correct. The engine's cylinder pressure is normal. The exhaust pipe temperature is low.

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What to Do When the Car Air Conditioning System Is Not Cooling?

What is the normal driving speed for a sedan?

What is the difference between Group IV and Group III oils?

Is the Vehicle Title Obtained at the DMV for a New Car?

Is it necessary to replace a damaged rear wheel liner?

Is Coating or Crystal Coating Better for New Cars?

Why Do Cars Drip Water in Summer?

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