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At what temperature does the car electric fan start to operate?

2 Answers

StMadelyn

07/30/25 1:21am

The electric fan generally starts to operate at around 90 degrees. The car electric fan is controlled by a thermostat and is designed to prevent the engine coolant temperature from becoming too high. It consists of components such as sensors, the electric fan, and a chip. When the coolant temperature exceeds approximately 90 degrees, the sensor activates, turning on the electric fan to lower the coolant temperature. Once the temperature drops to the lower limit, the thermostat cuts off the power, and the fan stops working. Below is relevant information about the car electric fan circuit: Fan Relay: If this circuit is open, it will result in the fan having no low-speed operation, and only one fan will operate at high speed. A short to ground will cause the fan to run continuously at low speed. A short to positive will damage the thermostat box and cause the fan to have no low-speed operation. Additionally, only one fan will operate at high speed. Power Supply: An open circuit here will cause the fan not to operate. This circuit must be checked using a test lamp, ensuring the lamp lights up brightly. If there is only 12V voltage but the test lamp does not light up brightly, the fan system will not function properly.

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VonHannah

08/15/25 6:59am

As an average car owner, I've noticed that the electric fan activation temperature isn't that fixed. Most vehicles start the fan when coolant reaches around 90°C, while in summer traffic jams it might not kick in until 100°C. My SUV usually has the fan humming when the temperature gauge needle rises to the middle position, whereas my friend's Japanese car is more sensitive. Besides cooling, the fan also activates earlier when the AC is on. If the coolant temperature exceeds 100°C during a long drive without hearing the fan, there's definitely an issue - you should pull over immediately to check fuses or sensors, otherwise the engine might overheat and stall.

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