The function of car fans
The core function of a car fan is to assist the engine and cooling system in dissipating heat, ensuring that the engine operates at an appropriate temperature and preventing performance degradation or damage due to overheating or overcooling
The main function of a car fan
Youdaoplaceholder0 Heat dissipation and cooling
The car fan accelerates the heat dissipation of the high-temperature coolant in the radiator (water tank) into the air by forcing air flow, preventing the engine from wearing out components, reducing efficiency or malfunctioning due to high temperatures.
When the coolant temperature reaches the critical value (such as 98℃), the fan starts automatically and adjusts the heat dissipation intensity through different speed gears.
For silicone oil fans, the silicone oil clutch will drive the fan to rotate at high temperatures, enhancing the cooling effect.
Youdaoplaceholder0 Maintain a constant temperature environment
Fans not only prevent overheating but also help the engine quickly heat up to its optimal operating temperature (usually around 90℃), reducing wear and pollutant emissions during cold starts.
Youdaoplaceholder0 Improve cooling system efficiency
When driving at low speed or idling, the fan compensates for the insufficient natural airflow to ensure the continuous and efficient operation of the radiator.
For turbocharged models, the intercooler fan (the second fan) is specifically designed to cool the intake air and enhance the combustion efficiency of the engine.
Fan types and characteristics
Youdaoplaceholder0 Mechanical fan
Driven by the engine crankshaft, the rotational speed varies with the engine, but it is noisy and has high energy consumption.
Youdaoplaceholder0 Electronic fan
Controlled by temperature sensors and ECU, it can start, stop or adjust the speed as needed, is energy-saving and has low noise, and is widely used in modern family cars.
Youdaoplaceholder0 Silicone oil fan
Stepless speed change is achieved through silicone oil clutches, and its stability and reliability are superior to those of electronic fans. It is commonly used in some high-performance or commercial vehicles.
Importance and collaborative work
The fan is a key component of the cooling system, working together with the radiator, thermostat and other components to maintain the stability of the engine temperature. If the fan malfunctions, it may cause the engine to overheat and get damaged, increase fuel consumption or exceed emission standards. For instance, in the dual-fan design, the radiator fan and the intercooler fan respectively dissipate heat for the coolant and intake air, jointly optimizing the engine performance.
The core cause of motor fan failure is damage to key components of the cooling system (such as relays, temperature control switches, temperature sensors, etc.) or abnormal coolant circulation, which increases the risk of engine overheating . The specific manifestations and solutions are as follows:
Common causes of faults and solutions
Youdaoplaceholder0 Electronic component failure
Youdaoplaceholder0 Relay damaged : Unable to conduct current properly to start the fan. Relay needs to be replaced
Youdaoplaceholder0 The temperature control switch/temperature sensor is malfunctioning : Unable to trigger the fan based on water temperature. Replace the corresponding part
Youdaoplaceholder0 Poor contact of the line : Check the connection status of the main control switch and the wires
Youdaoplaceholder0 Abnormal mechanical parts
Youdaoplaceholder0 Thermostat failure : causes coolant circulation to be blocked and the thermostat needs to be replaced
Youdaoplaceholder0 Fan motor damaged : Manifested as charred coil, stuck shaft rotation, needs to be replaced as a whole
Youdaoplaceholder0 Insufficient/deteriorated coolant : Regularly check the coolant level and replace it with standard antifreeze
Youdaoplaceholder0 Abnormal operating conditions of the system
Abnormal pressure or lack of refrigerant in the air conditioning system affects the fan linkage mechanism
Typical fault manifestations
Youdaoplaceholder0 Unusual smell and appearance
Burnt motor coil or burnt plastic smell
The rotational resistance of the shaft is large, accompanied by abnormal temperature rise
Youdaoplaceholder0 Abnormal operation mode
The fan doesn't rotate or stops completely
It can only operate at high speed but not at low speed (indicating a fault with the temperature control switch or thermostat)
Continuous operation without stopping (possibly due to the failure of the water temperature sensor)
Maintenance suggestions
Youdaoplaceholder0 Check the sealing and piping of the cooling system every 2 years or 40,000 kilometers
Youdaoplaceholder0 Long-term parking of vehicles Pay attention to system corrosion caused by the deposition of refrigerating oil
Youdaoplaceholder0 Modified vehicles ensure the compatibility of the turbocharged cooling system with the fan
Youdaoplaceholder0 Key notice: When the dashboard water temperature warning light is on, stop immediately for inspection, continuous driving may cause serious mechanical damage such as engine cylinder pulling .
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