What Causes High Radiator Temperature but Fan Not Spinning?

[McMelanie]

Reasons for high radiator temperature but fan not spinning: 1. The thermostat is functioning properly, the upper and lower water pipe temperatures are consistent, but the fan does not spin—possibly due to a faulty coolant temperature sensor; 2. The fan itself is damaged; 3. Poor contact in the fan power supply wiring; 4. Low coolant level in the radiator; 5. A faulty thermostat. The radiator is part of the car's cooling system, typically consisting of an inlet tank, outlet tank, header, and radiator core. Most car radiator fans operate via electronic temperature control, meaning the fan only starts spinning when the engine coolant reaches the required temperature. If the temperature is too low, the radiator fan will not spin. Therefore, when encountering a non-spinning fan issue, the first step should be to check whether the coolant temperature meets the required threshold.