Must the car air conditioning be used only after the vehicle is started?
2 Answers
Car air conditioning must be used only after the vehicle is started. Operation of car air conditioning: The cooling compressor of the car air conditioning system relies on the engine's operation to function, and the energy for warm air (hot water) is generated only when the engine is heated. If the air conditioning is turned on while the car is only powered but not started, it will not produce any cooling or heating effects. Instead, it will rapidly drain the car's battery, ultimately damaging it. Function of car air conditioning: Car air conditioning is used to adjust and control the temperature, humidity, air cleanliness, and airflow within the car cabin to optimal conditions, providing a comfortable environment for passengers and reducing travel fatigue. It also creates favorable working conditions for the driver, playing a crucial role in ensuring safe driving as a ventilation device.
As an ordinary person who drives frequently, I've noticed that the car air conditioning typically only works properly after the engine is started, especially the cooling function, because it requires the engine to drive the compressor. When the engine isn't running, you can only turn on the fan for airflow, but it won't cool the air. I remember one time during summer when I was waiting in the parked car, thinking the fan alone would suffice, but it got unbearably stuffy—I eventually had to start the engine to turn on the AC for relief. It's advisable not to use the air conditioning for too long with just the ignition on to avoid draining the battery. Moreover, using the AC after starting the engine is more efficient and helps prevent carbon buildup in the engine. As for the heating function, it's similar in cold weather—you need the engine to warm up first. In short, for safety and performance, it's better to develop the habit of turning on the AC only after starting the car.
