Why Doesn't the Car Fan Turn On When the Engine Starts?

[MilesLee]

There are several reasons why the car fan does not turn on when the engine starts: 1. The coolant temperature has not reached the required level: Most modern car radiator fans operate based on electronic temperature control. Therefore, the fan will only start working normally when the coolant temperature reaches the specified level. If the temperature is too low, the radiator fan will not turn on. Hence, if the radiator fan fails to operate, the first thing to check is whether the coolant temperature meets the required standard. 2. Relay malfunction: If the coolant temperature is appropriate but the radiator fan still does not work, the issue might lie with the fan relay. A faulty relay can prevent the radiator fan from functioning. 3. Thermostat switch problem: Occasionally, the thermostat switch may malfunction, which can also affect the operation of the radiator fan. Therefore, it is important to inspect this component as well.