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What is the working principle of an automotive electric air conditioning system?

1 Answers
MacSamuel
07/30/25 7:04am
The working principle of an automotive electric air conditioning system is as follows: When the AC button is pressed for cooling, the electric compressor starts operating. The compressor continuously compresses the refrigerant and delivers it to the evaporator. Inside the evaporator, the refrigerant expands and absorbs heat, thereby cooling the evaporator. The cooled evaporator then cools the air blown by the blower, resulting in cold air being discharged from the air vents. For heating, the system relies on the high-temperature coolant from the engine. When the heater is turned on, the hot coolant flows through the heater core, and the air from the blower passes over the heater core, allowing warm air to be discharged from the air vents.
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Why Does the Engine Sound Louder When the Car Air Conditioner is On?

The reasons for the louder engine sound when the car air conditioner is on: dirty or stuck throttle valve, abnormal noise from the air conditioning pump, etc. Here are the detailed explanations: Dirty or stuck throttle valve: After the air conditioner is turned on, the compressor also starts working. The compressor is driven by the engine, so turning on the air conditioner increases the engine load. This means the engine needs to increase the throttle opening to allow more air intake. When the throttle valve has carbon deposits or is stuck, it can cause engine vibration and abnormal noise. This becomes more noticeable after the air conditioner is turned on. Abnormal noise from the air conditioning pump: There are two main reasons for abnormal noise from the air conditioning pump: the electromagnetic clutch and the bearings inside the air conditioning pump. The noise from the electromagnetic clutch is mainly caused by wear, which increases the gap. The noise from the air conditioning pump bearings is mainly due to insufficient lubrication. If these issues are not resolved in time, they can lead to the burning out of the air conditioning pump, making it unable to perform cooling tasks.
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Will changing the steering wheel affect the airbag?

Changing the steering wheel will not affect the airbag. However, when removing it, the steering wheel must be placed in the center position, and the clock spring must also be in the center position; otherwise, it may break, causing the airbag warning light to illuminate. The airbag control module is usually located in front of or beneath the gear lever. Below is some relevant information about the airbag system: 1. The airbag system is a passive safety protection system (see vehicle safety performance). When used in conjunction with seat belts, it provides effective collision protection for occupants. In the event of a car collision, the airbag can reduce head injuries by 25% and facial injuries by approximately 80%. 2. The airbag system mainly consists of airbag sensors, collision airbags, and an electronic control unit. The driver-side collision airbag is installed in the steering wheel, while the passenger-side collision airbag is typically mounted on the dashboard. Airbag sensors are installed on the left, right, and center of the cabin partition; the central airbag sensor and the airbag system are integrated with the electronic control unit. The airbag assembly primarily includes the airbag, gas generator, and igniter. The electronic control unit is used for data collection and processing, diagnosing the reliability of the airbag, ensuring that the ignition signal is promptly issued when preset values are reached, and timing the ignition to ensure the gas generator has sufficient driving current.
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What do the plus and minus signs on the D gear of an automatic transmission car mean?

The D gear with plus and minus signs on an automatic transmission car is for a semi-automatic transmission, which is a type of automatic transmission. It adds the function of manual shifting on top of the automatic transmission, but there is essentially no significant difference between the two. Here is an introduction to the relevant content: 1. First, pull the gear lever down to engage the "D" gear, then push the lever to the left until "M/S" lights up, which means you have entered manual mode. When you need to shift gears, push the lever forward to downshift and pull it backward to upshift. 2. Push the lever back to the right to return to automatic mode. You can switch between manual and automatic modes at any time without braking, and you don't need to release the accelerator. Also known as the drive gear, when the gear lever is placed in this position, the hydraulic system control device automatically connects the corresponding forward gear oil circuit based on the throttle opening signal and vehicle speed signal. 3. The D gear of an automatic transmission car does not have the engine braking function and will continuously shift to higher gears as the downhill speed increases, causing the car to go faster and faster. You must constantly use the foot brake to control the speed, which can easily cause the brakes to overheat and fail due to excessive use, which is very dangerous. Therefore, when driving an automatic transmission car on a long downhill, do not use the D gear to prevent accidents.
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What does the R gear mean in a car?

The R gear in a car stands for Reverse gear, which is the abbreviation of the English word 'Reverse'. The function of this gear is to enable the vehicle to move in the opposite direction, allowing it to reverse. In manual transmission vehicles, it also serves as a hill-hold function. When parking on a downhill slope, the drive shaft can be mechanically locked by engaging the reverse gear, but this should not be overly relied upon. The primary braking of the vehicle should be done using the braking system, as using the reverse gear for braking carries certain risks. Below are the methods for using the R gear: 1. For vehicles equipped with an automatic transmission, first press the brake pedal and then press the safety button on the gear lever or push down the gear selector to engage or disengage the R gear. The R gear can be engaged when the vehicle is in P (Park) or N (Neutral) gear, but switching between D (Drive) and R gears requires passing through N gear. In other words, to shift from D to R gear, you must first shift to N gear, which helps reduce the impact of reverse oil flow in the transmission during gear changes. 2. For vehicles with a manual transmission, first bring the vehicle to a complete stop, then press the clutch and brake pedals, shift into R gear, and finally perform a semi-clutch operation with slight acceleration.
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What to Do When Your Car Gets a Dent?

When your car gets a dent, it can be repaired through traditional metalworking. Metalworking repair involves restoring the deformed part of the car's metal shell. After the dent is repaired through metalworking to restore its original shape, specialized paint is sprayed to make the deformed metal surface of the car look as good as new. Here is some relevant information about car metalworking: 1. Car metalworking is a technical method of car repair. In this context, car metalworking is equivalent to car metalworking repair, which refers to all the work required to repair the car body after a collision, apart from the anti-corrosion and decorative painting work. This includes analyzing the damage to the car body, measuring the car body, shaping the car body metal, stretching and correcting, stress-relief welding, as well as assembling and adjusting car body accessories. 2. When repairing car dents, it is not only necessary to understand the technical parameters and dimensions of the car body but also to master the characteristics of the car body materials, the transmission of force characteristics, the deformation trends and stress points of the car body, and the production processes of the car body, such as welding techniques. Based on this knowledge, advanced measuring tools are also required. Through precise three-dimensional measurements of the car body, the direct and indirect damage and deformation of the car body can be assessed, as well as any hidden dangers caused by the deformation. A complete car body repair plan can then be formulated. By combining the correct repair techniques with accurate three-dimensional dimensional data of the key points of the car body, the key points of the car body can be restored to their original positions, bringing the damaged car body back to its factory condition.
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What is TCS?

TCS (Traction Control System) is a traction control system, also known as a track control system. Here is an introduction to the relevant knowledge about TCS: 1. Function: Its role is to control the direction and improve traction when the car slips, preventing loss of control. 2. Principle: It determines whether the drive wheel is slipping based on the rotation speed of the drive wheel and the transmission wheel. When the former is greater than the latter, it suppresses the rotation speed of the drive wheel as an anti-slip control system. When the drive wheel slips, it uses the braking system to increase the brake oil pressure of the slipping wheel, applying appropriate braking to limit wheel slip.
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