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What Causes a Car Fan to Keep Running Non-stop?

3 Answers

JaxsonFitz

08/26/25 3:48am

Car fan keeps running non-stop due to excessively high coolant temperature. Specific reasons: When the coolant temperature remains too high after parking, the vehicle's computer automatically calculates the fan speed and duration. The higher the temperature, the longer the fan runs to protect the engine. You can try unplugging the fan wiring harness for separate power interruption. Fan function: The car fan serves a cooling purpose. When the coolant temperature is too high after parking, the vehicle's computer automatically calculates the fan speed and duration. The higher the temperature, the longer the fan operates to protect the engine.

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MacLola

09/08/25 4:37am

I've encountered this issue several times, mainly due to the cooling system acting up. The most common cause is a faulty coolant temperature sensor - when the ECU doesn't receive proper cooling signals, it keeps the fan running at full speed. Another possibility is a thermostat stuck in the closed position, preventing coolant circulation and causing the engine to overheat. A dirty condenser or excessive AC pressure can also trigger continuous fan operation as the compressor is overloaded. The most troublesome case is when the cooling fan relay gets stuck, keeping the fan running even after turning off the engine. Last year, my relative's car had a damaged fan resistor, forcing the cooling system to operate at maximum speed - it sounded like a helicopter when driving on the highway.

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JordanMarie

10/22/25 4:41am

If the fan keeps running non-stop, first check if the upper and lower radiator hoses have uniform temperatures. If one is cold and the other hot, it's definitely a thermostat issue. Many modern cars use electric fans with complex control logic. Once, my car's fan suddenly went into overdrive during traffic congestion—turned out the radiator and AC condenser were clogged with poplar fluff, cutting cooling efficiency by 30%. The mechanic explained today's vehicles come with PWM speed control modules; if these fail, the fan either stops or runs wild. They rely on scan tools to read live data streams—the most reliable method to detect if coolant temperature sensor readings are drifting.

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How to turn on the air conditioning in Wuling Hongguang S?

The method to turn on the air conditioning in Wuling Hongguang S is: 1. Turn the car key to start the engine; 2. Let the engine idle; 3. Turn the fan speed switch to the right to increase the airflow; 4. Turn the temperature knob to the left to the blue zone; 5. Press the AC button to turn on the compressor, and cold air will blow out from the vents. The AC on the panel is the compressor switch, which is the air conditioning cooling switch. The functions of automatic air conditioning include automatic adjustment of interior temperature and humidity, automatic control of air recirculation and supply modes, as well as operation mode and ventilation volume control. Wuling Hongguang S is a crossover independently developed product between commercial vehicles and passenger vehicles launched by SAIC-GM-Wuling based on the Wuling Hongguang model, featuring a more car-like interior design and upgraded power with a 1.5L DVVT engine.

Where should a car fire extinguisher be placed?

Car fire extinguishers should be placed under the seat, and can also be placed in: 1. the glove compartment inside the car; 2. beside the seat; 3. the trunk. The storage environment temperature for car fire extinguishers should be within the range of -10 degrees to 45 degrees Celsius, and the place where the fire extinguisher is placed should be kept dry and ventilated to prevent the fire extinguisher from getting damp and corroding. It is recommended to replace car fire extinguishers once a year, as the powder inside a dry powder fire extinguisher may explode if it expires. Car fire extinguishers are specifically designed for car fires and include two main types: non-pressure storage hanging ultra-fine dry powder automatic fire extinguishing devices for vehicles and miniature pressure storage hanging ultra-fine dry powder automatic fire extinguishing devices for vehicles.

What procedures are required for licensing an imported car?

Import car licensing requires the following procedures: 1. Prepare necessary documents for licensing, including the original and copy of the Certificate of Imported Goods, the original and copy of the Inspection Certificate for Imported Motor Vehicles, the original unified invoice for motor vehicle sales, a copy of personal ID, and the duplicate of compulsory traffic insurance; 2. Go to the local Entry-Exit Inspection and Quarantine Bureau to exchange for the Quarantine Certificate for Imported Motor Vehicles and fill out the application form; 3. Provide the Certificate of Imported Goods, the Inspection Certificate for Imported Motor Vehicles, a copy of the car purchase invoice, a copy of the organization code certificate with the official seal of the unit, or for individuals, provide a copy of the ID card with a signature; 4. Go to the State Tax Bureau to pay the vehicle purchase tax, fill out the purchase tax declaration form, and provide the Certificate of Imported Goods, a copy of the locally exchanged Inspection Certificate for Imported Motor Vehicles, the tax payment copy of the car purchase invoice, and a copy of the organization code certificate; 5. Go to the Vehicle Management Office and provide the original Certificate of Imported Goods.

What does ECO mean in Chinese?

ECO in Chinese refers to the vehicle's economical driving mode function. ECO is an English abbreviation derived from the combination of Ecology (environmental protection), Conservation (energy saving), and Optimization (power). The Eco mode is further divided into active Eco driving mode and non-active Eco driving mode. When the Eco indicator light on the dashboard illuminates, it indicates that the vehicle's economical mode has been activated. The Eco mode is categorized into active and non-active types. The difference lies in the fact that the active type has its own dedicated button, allowing the driver to choose whether to activate it. When the driver presses the Eco mode switch, the dashboard indicator light immediately illuminates, and the vehicle automatically begins adjusting settings such as throttle opening, transmission shift logic, and air conditioning output power. The non-active Eco mode does not have a dedicated button. When the Eco indicator light on the dashboard illuminates, it serves merely as a reminder function. The Eco system automatically evaluates your driving behavior. If your current driving operation achieves the optimal fuel supply, the dashboard will simultaneously display the Eco indicator light. Most vehicles employ the active Eco driving mode, meaning they have a dedicated switch button. Therefore, during daily driving, we can activate the Eco mode. However, it is unnecessary to enable the Eco mode when the speed exceeds 120 km/h, during idle parking, in N/P gear, or manual mode, especially when climbing hills. Doing so would not only fail to demonstrate the fuel-saving characteristics of the Eco mode but also affect the vehicle's power performance. Additionally, the Eco mode typically becomes ineffective under the following circumstances: When the vehicle speed exceeds 120 kilometers per hour, the system prioritizes speed, causing the Eco mode to automatically deactivate. During idle parking or when in N/P gear or manual mode, the Eco mode may also become ineffective. When high torque output is required, such as when climbing a hill, the engine control unit prioritizes ensuring sufficient power to drive the vehicle, and the Eco mode will not operate under such conditions.

What to Do If Your Driver's License Is About to Expire and You Can't Renew It in Time?

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