What causes the Peugeot 308's fan to keep running after the engine is turned off?
1 Answers
The reasons why the Peugeot 308's fan keeps running after the engine is turned off include the following: 1. Insufficient coolant leading to high water temperature, causing the fan to run continuously. 2. The thermostat fails to open, preventing water circulation and resulting in high water temperature. 3. The water temperature sensor is damaged. 4. The fan relay is damaged. The functions of the cooling fan are as follows: 1. It is part of the car's cooling system: The radiator in the engine's water cooling system consists of three parts: the inlet chamber, outlet chamber, main plate, and radiator core. The coolant circulates inside the radiator core, while air passes outside the radiator core. The hot coolant cools down by dissipating heat to the air, and the cold air heats up by absorbing the heat from the coolant, making the radiator a heat exchanger. 2. The radiator also serves as a water storage and heat dissipation device: The car radiator cap is equipped with an air and steam valve and has a common vent hole connected to the atmosphere. When the water temperature rises, the coolant in the car radiator expands, and the steam pressure increases, opening the steam valve to release air. When the water temperature drops, the pressure decreases, and the air valve opens, allowing outside air to enter the radiator through the common vent hole, thus maintaining constant pressure inside the radiator. 3. The radiator protects the engine from damage caused by overheating: The principle of the radiator is to use cold air to lower the temperature of the coolant from the engine. The radiator has two main components: the radiator fins, made up of small flat tubes, and the overflow tank (located at the top, bottom, or sides of the radiator fins).
