What's the matter if the car fan doesn't rotate?
1 Answers
If the car fan doesn't rotate, the first thing to check is whether the coolant temperature has reached the required level. The fan will only rotate when the coolant temperature reaches the specified level; it won't rotate at lower temperatures. If the coolant temperature has reached the required level but the fan still doesn't work properly, it might be due to a faulty relay in the fan. In this case, you should visit a 4S shop or a repair shop to have it fixed by professionals. Another possible issue could be with the thermostat switch. If the thermostat switch malfunctions, it won't be able to control the fan's start and stop. How the car fan works: Based on the water temperature and engine load, signals are sent to the computer. The engine computer controls the high and low-speed relays of the fan, which is also influenced by the air conditioning pressure. The principle is as follows: the air conditioning computer receives signals from the air conditioning pressure switch, indoor and outdoor temperatures, etc., and then transmits the air conditioning signal to the engine computer via the bus. Upon receiving the signal to activate, the engine controls the compressor and simultaneously engages the fan relay. When the air conditioning pressure increases due to environmental or internal factors, the engine computer receives the signal from the air conditioning computer and engages the high-speed fan relay, causing the fan to operate at high speed. The role of the car cooling fan: Most of its functions are used for engine cooling and coolant cooling, ensuring that the engine does not malfunction due to high temperatures. In high-temperature working environments, the engine must be properly cooled to maintain it at a suitable operating temperature, meeting the requirements for good engine performance, durability, and exhaust emissions. The engine cooling system plays a key role here. The radiator serves both as a water storage and cooling function. The car radiator cap is equipped with an air vapor valve and has a common vent connected to the atmosphere. When the water temperature rises, the coolant in the car radiator expands, increasing the vapor pressure, and the vapor valve opens to release the vapor. When the water temperature drops, the pressure decreases, and the air valve opens, allowing outside air to enter the radiator through the common vent, thereby maintaining constant pressure inside the radiator. The radiator is the main part of the cooling system, designed to protect the engine from damage caused by overheating.
