Is it normal for the fan not to turn on at 90℃ water temperature?

[JeffreyFitz]

It is abnormal for the fan not to turn on at 90℃ water temperature. When a motor vehicle's water temperature reaches 90 degrees, it indicates that the vehicle's radiator temperature has reached the normal operating level, and the fan should activate to lower the water temperature. Below is a detailed introduction to the car radiator (professionally known as the cooling system): Main components: The radiator is part of the vehicle's cooling system. In an engine's water cooling system, the radiator consists of three main parts: the inlet chamber, outlet chamber, main plate, and radiator core. Primary function: When the engine's water temperature is high, the water pump circulates water repeatedly to reduce the engine's temperature (the radiator is composed of hollow copper tubes. Hot water enters the radiator, is cooled by air, and then circulates back to the engine cylinder walls), thereby protecting the engine. In winter, if the water temperature is too low, the water circulation stops to prevent the engine from becoming too cold.