When Does the Car Radiator Fan Turn On?

1 Answers
AnthonyMarie
07/29/25 3:58pm
Car Radiator Fan When to Turn On_58 Auto The normal operating temperature of a car engine is between 95-105 degrees Celsius. If the coolant temperature exceeds 105 degrees, the computer will detect it and activate the radiator fan. Once the temperature drops back to 105 degrees, the radiator fan will stop working to ensure the engine operates within the normal temperature range. The reasons why a car radiator cooling fan does not turn on are as follows: 1. Whether the coolant temperature meets the requirement: With the continuous development of automobiles, many car cooling fans now operate based on electronic temperature control. During driving, the cooling fan will only activate when the coolant temperature reaches the required level. If the coolant temperature in the radiator does not meet the requirement, the cooling fan will not work. In this case, the cooling fan is not faulty, and the coolant temperature should be checked. 2. Relay failure: If the coolant temperature has reached the threshold for the fan to turn on but the engine cooling fan still does not work, it may be due to a faulty relay. A malfunctioning relay cannot transmit signals, preventing the cooling fan from operating. 3. Faulty temperature control switch: If the above components are confirmed to be functioning properly, the temperature control switch should be inspected. A faulty temperature control switch can also disrupt the normal operation of the cooling fan.
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