What is the reason for the electric fan running continuously?

[LeNadia]

The reason for the electric fan running continuously is a circuit malfunction. The working principle of the electric fan is that the car's electric fan is controlled by a thermostat. When the water temperature rises to the upper limit, the thermostat turns on the power and the fan starts working. When the water temperature drops to the lower limit, the thermostat turns off the power and the fan stops working. The method to replace the electric fan is: 1. Open the car's hood and remove the intake pipe located above the fan; 2. Use professional tools to unscrew the screws; 3. After all the screws are removed, take the fan off the car; 4. Install the new fan correctly on the new fan bracket and tighten the four fixing screws; 5. Start the engine to test whether the fan can operate normally. After checking and confirming everything is correct, install the intake pipe to the correct position.

[OLuke]

I've driven several cars and encountered situations where the fan kept running. The most common issue is when the coolant temperature hasn't dropped, possibly due to a faulty sensor or insufficient coolant. That one summer when I was driving, the engine got extremely hot, and the fan kept buzzing. Later, I found out the radiator was clogged with accumulated dust. Another time, a relay got stuck due to an electrical circuit problem, causing the fan to run non-stop until it drained the battery. Luckily, it didn't happen on the highway. I usually recommend regular checks of the cooling system, cleaning the radiator fins, and changing the coolant. Neglecting these small maintenance tasks might leave your car stranded someday, and towing fees aren't cheap. After repairs, it became much quieter, and driving felt more reassuring.

[Freddy]

I have kids at home, and I get extremely nervous every time the fan keeps running non-stop. It could be due to a faulty temperature sensor or a short circuit, with the control module being the most common issue. During my last car repair, the mechanic mentioned that the relay was stuck, causing the fan to run continuously. Not only is this noisy, but it also wastes electricity, and in severe cases, the engine can overheat—especially dangerous when using the AC in summer. I usually make it a habit to check if the fan is still running after parking, as addressing it promptly can save money and hassle. If you're planning a long drive in hot weather, a pre-trip inspection is crucial. Cost-wise, minor repairs can be done for a few hundred bucks, but major repairs can be troublesome. Safety first—don't let it escalate into a bigger problem.

[DelLilah]

I've been into car modification for a long time, and the fan keeps running usually due to a fault in the temperature control system. The electric fan is controlled by the engine computer, and sensor malfunctions or programming errors can cause it to misjudge high temperatures. A short circuit in the relay is also a common cause. Every time I work on the circuit, I'm careful to prevent the fan from running continuously and draining the battery, which could affect startup. Paying attention to this during daily driving can extend the lifespan of the parts.