When Does the Car Fan Turn On?

[DeNaomi]

The radiator fan in a car operates based on the coolant temperature, typically activating when the temperature reaches around 80-90 degrees Celsius. The reasons why a car radiator fan may not turn on are as follows: 1. Whether the coolant temperature meets the requirement: With the continuous advancement of automobiles, many car radiator fans now operate electronically based on temperature control. During driving, the radiator fan will only turn on when the coolant reaches the required temperature. If the coolant temperature in the radiator does not meet the requirement, the fan will not operate, indicating that the fan is not faulty but that the coolant temperature needs to be checked. 2. Relay failure: If inspection shows that the coolant temperature has reached the threshold for the fan to operate, but the engine's radiator fan still does not work, it may be due to a faulty relay. A malfunctioning relay cannot transmit signals, preventing the radiator fan from operating. 3. Thermostat switch issue: If all the above components are confirmed to be functioning properly, the thermostat switch should be inspected. A faulty thermostat switch can also disrupt the normal operation of the radiator fan.