How many models does the Fast 12-speed transmission have?

What happens when there is air in the car radiator?

The presence of air in the car radiator essentially means there is an airlock in the coolant, which can hinder the smooth circulation of the coolant. Below are some precautions regarding the use of a car radiator: 1. Always use dedicated radiator fluid or qualified antifreeze: When selecting radiator fluid or antifreeze, opt for high-quality, diluted radiator fluid or antifreeze. In case of an emergency shortage, you can supplement with tap water to prevent unnecessary losses due to lack of coolant. Additionally, dedicated radiator fluid and antifreeze offer freeze and boil protection, which water cannot match. 2. Do not overfill the car radiator: If adding water, avoid filling it too much or completely, as this can lead to significant overflow due to thermal expansion, leaving behind water stains and scale deposits on the surface. Moreover, adding water can cause scale buildup in the cooling system, clogging pipes, impairing heat dissipation, and damaging the engine. 3. The fluid level in the car radiator should be maintained between the min and max marks: If it falls below the min mark, it is necessary to add the same brand and specification of coolant, or replace the entire coolant. The choice of coolant primarily depends on the local minimum temperature, and the factory-fill is typically all-season type.

8

4

Share

What kind of clutch does the Civic have?

The Civic's clutch is a CVT continuously variable transmission. CVT Transmission: CVT refers to a type of automotive transmission, also known as a continuously variable transmission. The difference between a CVT and a stepped transmission is that its gear ratio is not a series of discrete points but a continuous range of values, resulting in excellent fuel economy, power performance, and smooth driving experience, while also reducing emissions and costs. Advantages of CVT Transmission: Since it lacks the gears found in conventional automatic transmissions, the CVT eliminates the gear-shifting process of automatic transmissions, thereby removing the associated gear-shift jolt. As a result, the power output of a CVT transmission is linear, providing an exceptionally smooth driving experience in practice. Theoretically, a CVT's transmission system can have an infinite number of gear ratios, allowing for more flexible gear settings. It also makes it easier to achieve a balance between gear ratio, speed ratio, performance, fuel consumption, and exhaust emissions compared to traditional transmission systems.

20

2

Share

How is Tire Pressure Monitoring Achieved?

Tire pressure monitoring can be achieved through three methods: Direct Tire Pressure Monitoring: Direct tire pressure monitoring devices use pressure sensors installed in each tire to directly measure the tire's air pressure. A wireless transmitter sends the pressure information from inside the tire to a central receiver module, which then displays the pressure data for each tire. The system automatically alerts when the tire pressure is too low or if there is a leak. Indirect Tire Pressure Monitoring: When the pressure in a tire decreases, the vehicle's weight causes the rolling radius of that wheel to become smaller, resulting in a faster rotation speed compared to the other wheels. By comparing the differences in rotation speeds between the tires, the system monitors tire pressure. Indirect tire pressure warning systems essentially rely on calculating the rolling radius of the tires to monitor pressure. Tire Pressure Monitoring System (TPMS): This system combines the advantages of the two aforementioned systems. It is equipped with direct sensors in two diagonally opposite tires and includes a 4-wheel indirect system. Compared to using only a direct system, this hybrid system can reduce costs and overcome the limitation of indirect systems, which cannot detect when multiple tires simultaneously have low pressure. However, it still cannot provide real-time data on the actual pressure in all four tires as a direct system does.

13

1

Share

What Causes the ABS Pump Noise During Passat Lingyu Startup?

Passat Lingyu startup ABS pump noise may be caused by insufficient or damaged power steering pump fluid, ABS pump self-checking, or internal control short circuit in the ABS pump. Insufficient or damaged power steering pump fluid: When the power steering pump lacks fluid or is damaged, it can cause abnormal noise in the ABS pump during vehicle startup. It is recommended to check whether the power steering fluid is insufficient. If it is insufficient, replenish it; if not, it indicates that the power steering pump is damaged and needs to be repaired or replaced at a 4S shop. ABS pump self-checking: Every time the vehicle starts after the power is turned on, the ABS pump will operate to build system pressure and perform a self-check. The operating sound of the ABS pump at this time is a normal phenomenon. Internal control short circuit in the ABS pump: If the ABS pump keeps making noise, it may be due to an internal control short circuit. In this case, it is necessary to go to a 4S shop or a professional repair shop for maintenance.

9

1

Share

How Often Should Valve Stems Be Replaced?

Because valve stems are made of rubber material, they are inevitably prone to cracking, deformation, and loss of elasticity. During daily driving, rubber valve stems undergo various deformations as they swing back and forth due to centrifugal force, which undoubtedly accelerates their aging. The typical lifespan of such rubber valve stems is about three to five years, similar to that of tires. Therefore, when replacing tires, remember to replace the valve stems as well. Below is the replacement cycle for valve stems: 1. New valve stems must be installed when replacing tires. This is because valve stems are rubber products and are subject to aging cycles. Even if the valve stems appear fine at the time of tire replacement, they may age prematurely during the new tire's usage cycle, posing safety risks. 2. Tire valve stems are one-way valves (check valves) used for inflating or deflating gases or liquids in tires and for maintaining and detecting internal pressure. 3. For tube-type tires, they are installed on the inner tube, while for tubeless tires, they are mounted on the rim. 4. Based on structure, they can be divided into two types: rubber-metal valve stems and metal valve stems with rubber gaskets. The former is used for inner tubes of passenger car tires, while the latter is mainly used for inner tubes of truck tires. The internal structure of tubeless tire valve stems is the same as that of ordinary valve stems.

8

2

Share

How many liters of gear oil should be added to the manual transmission of the Volkswagen New Jetta?

Volkswagen New Jetta manual transmission requires approximately three liters of gear oil. Introduction to automotive gear oil: It is a high-viscosity lubricating oil specifically designed to protect power transmission components, typically accompanied by a strong sulfur odor. Vehicle gear oil is classified based on performance and viscosity. Currently, the American Petroleum Institute (API) performance classification and U.S. military gear oil specifications are widely adopted worldwide. Most manual transmission lubricants and differentials use quasi-hypoid gear oils. These contain extreme pressure (EP) additives and anti-wear additives to handle the action of hypoid bevel gears. Working conditions of gear oil: During operation, gear oil experiences continuous changes in gear contact surfaces, with temperatures rising moderately, typically ranging from 10-80°C. Additionally, gear oil is subjected to extremely high pressure. During gear transmission, the unit pressure at the meshing part of the teeth can reach (196-245)×10 kPa, while hypoid gears can withstand unit pressures of (294-392)×10 kPa. Moreover, gear oil operates under conditions of significant speed variations and frequent rotations, making it prone to being squeezed out from the gaps between teeth, resulting in semi-fluid friction.

1

0

Share

How many models does the Fast 12-speed transmission have?

What happens when there is air in the car radiator?

What kind of clutch does the Civic have?

How is Tire Pressure Monitoring Achieved?

What Causes the ABS Pump Noise During Passat Lingyu Startup?

How Often Should Valve Stems Be Replaced?

How many liters of gear oil should be added to the manual transmission of the Volkswagen New Jetta?

Is the Corolla Considered a Low-End Car?

How many kilometers can a Haval First Love run with 55 liters of fuel?

What time is the afternoon session of Subject 3?

Can I leave right after finishing the Subject 4 test?