What kind of air does the car's air conditioner automatically blow when the engine is turned off and the power is cut off?
2 Answers
When the car's engine is turned off and the power is cut off, the air conditioner automatically blows natural air because the air conditioner compressor is driven by the engine's power. When the car is turned off, the compressor naturally stops working. The natural air blown by the blower is powered by the battery, and prolonged use of the blower may drain the battery, leading to long-term power loss. Below is an extended introduction to the hazards of prolonged use of the car's air conditioner: Especially when using the internal circulation mode for a long time, the lack of air circulation in the car can make the enclosed air inside the car stuffy. Some air conditioner pipes may also have mold and dirt, which can easily cause fatigue, dry skin, and other discomforts. In severe cases, it may even lead to numbness in the hands and feet, headaches, sore throat, neuralgia, and gastrointestinal discomfort.
From a technical perspective, the car's air conditioning system should not automatically blow any air after the engine is turned off and power is cut, as power interruption means a complete shutdown of electrical supply. The air conditioning system, including the fan, requires electricity to operate. In my daily experience with vehicles, power cut is a signal for all electrical equipment to shut down, and the blower naturally stops. If any airflow is detected, it is abnormal and may be caused by residual charge in capacitors leading to brief operation or wiring faults, which can easily drain the battery or cause other issues. It is necessary to check the air conditioning-related fuses in the fuse box, the blower motor, and the control module to ensure the system enters normal sleep mode. Regular maintenance should include cleaning the air conditioning filter and wiring to avoid malfunctions.
