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What is the principle of the three wires in an automotive electric fan?

2 Answers

ElisaLynn

07/25/25 9:30am

The principle of the three wires in an automotive electric fan is controlled by a thermostat. When the water temperature rises to the upper limit, the thermostat connects the power supply, and the fan operates. When the water temperature drops to the lower limit, the thermostat turns off the power supply, and the fan stops working. Below is a detailed introduction to why an automotive electric fan may not rotate: 1. Poor motor lubrication: This can cause the motor to be unable to drive the fan blades after installation. 2. Motor overheating: Overheating can reduce the motor's load-bearing capacity and effective power, making it unable to drive the load. 3. Prolonged motor usage: Extended use of the motor can lead to wear and tear. If the electric fan is used for a long time, the motor may deteriorate, and the shaft sleeve may wear out, increasing the risk of burnout. Prolonged use can also increase the motor's internal resistance, reducing its load-bearing capacity and preventing it from driving the fan blades.

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Teixeira

08/11/25 7:19pm

The three-wire principle is actually quite ingenious. The power wire is directly connected to the positive terminal of the battery to maintain constant power supply, the ground wire connects to the vehicle body to complete the circuit, and the control wire is the key—managed by the engine control unit (ECU). When the coolant temperature rises, the ECU sends a signal through this wire to adjust the fan speed, enabling high and low-speed switching to save energy. For example, changes in the control wire voltage trigger the fan to operate at low or high speed, protecting the engine from overheating and extending component lifespan. The overall design reflects advancements in intelligent automotive temperature control, making cooling more efficient and energy-saving. This requires precise sensors and circuitry to ensure reliability.

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How Long Can a Flood-Damaged Car Be Driven?

A flood-damaged car that has been repaired can generally be driven for three to four years, with some lasting four years and others up to five years. Therefore, the actual duration depends on the vehicle's condition. Additional Information: Reasons why flood-damaged cars cannot be fully repaired: Flood-damaged vehicles cannot be 100% restored to their original state and pose significant safety hazards. For example, the electronic systems are prone to short circuits, and if critical systems like ABS anti-lock braking, ESP stability control, or the engine ECU fail to function, the consequences could be disastrous. Other hazards of flood-damaged cars: Additionally, flood-damaged vehicles have other safety risks. Hot components such as the engine and exhaust pipe cool down rapidly when submerged, leading to deformation and increased unbalanced stress, which affects the lifespan of these parts. Moreover, dirty water can corrode the damaged structure of the car body, and some hidden areas cannot be treated with anti-rust paint. Over time, this corrosion weakens the car's structure, which is one of the major reasons why flood-damaged cars should be avoided.

Can a Flooded Car Still Be Driven?

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What is the National Emission Standard for IV?

National IV refers to the National 4 emission standard. It can fully control compliance through real-time monitoring of vehicle emissions, ensuring better enforcement of the Euro III emission standards. Here is some extended information: 1. National IV Emission Standard: The National IV emission standard is the fourth phase of China's motor vehicle pollutant emission standards. The main pollutants emitted by vehicles include HC (hydrocarbons), NOx (nitrogen oxides), CO (carbon monoxide), and PM (particulate matter). By applying technologies such as improved catalytic converter active layers, secondary air injection, and exhaust gas recirculation systems with cooling devices, the standard aims to control and reduce vehicle emissions to below specified levels. 2. National 4 Standard: The National 3 and National 4 standards are based on the Euro 3 and Euro 4 vehicle emission standards. Compared to National 2, National 3 further reduces pollutant emission limits. The tailpipe pollutant emission limits under China's National 3 standard are 30% lower than those under National 2, while National 4 will reduce them by an additional 60%. To ensure stable compliance with emission limits during vehicle use and the durability of emission control performance, requirements for On-Board Diagnostics (OBD) and in-use compliance have been added.

Why Doesn't the Fuel Gauge Show Full After Filling the Tank?

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What does 'a wolf in sheep's clothing' mean?

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What is CIRI in the automotive industry?

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