Symptoms of a Faulty Radiator Fan Resistor?

1 Answers
OLaura
07/29/25 6:58pm
The main symptom of a faulty car cooling fan resistor is that the cooling fan runs continuously without adjusting its speed based on the engine coolant temperature. Prolonged high-speed operation can affect the lifespan of the cooling fan, while prolonged low-speed operation may lead to excessively high coolant temperatures, failing to cool the engine promptly and potentially causing engine damage. Therefore, a faulty cooling fan resistor should be replaced immediately. Below is a detailed introduction to the car radiator fan: Automatic activation conditions: The radiator fan automatically turns on when the coolant temperature reaches 98°C. The car radiator fan activates automatically and cannot be manually controlled; it does not start at low temperatures, and operates at two speed levels for medium and high temperatures. Radiator fan speed levels: Typically, the medium speed activates at 95°C, and the high speed activates at 105°C. When the coolant temperature reaches 95°C, the fan starts and runs at 1600 RPM. When the temperature reaches 105°C, the fan speed increases to approximately 2400 RPM to enhance cooling efficiency.
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