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Must the car air conditioning be turned on only after the car is started?

2 Answers

MacLydia

09/05/25 8:02am

It is best to turn on the car air conditioning after the car is started. The air conditioning cannot be used when the car is not running. The operation of the car air conditioning's cooling compressor relies on the engine running to drive it and the energy from the heating system (hot water). Below is a detailed introduction about car air conditioning: 1. Overview: The car air conditioning device (air-conditioning-device), referred to as car air conditioning, is used to adjust and control the temperature, humidity, air cleanliness, and air flow inside the car cabin to the optimal state. 2. Function: It provides a comfortable riding environment for the driver, reducing travel fatigue; it creates good working conditions for the driver, ensuring driving safety. The car air conditioning system usually includes a cooling device, heating device, and ventilation device.

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DeKylie

09/17/25 8:13am

I've been driving a taxi for 15 years and know exactly how to work the AC. The AC cooling must start the engine because the compressor relies on the engine to run. However, the fan mode is different—you can turn on the blower as soon as the vehicle is powered on. In some newer models, after pressing the start button, the AC button may already be lit, but the air from the vents is just natural airflow until the engine starts and cold air kicks in. In summer, remember to open the doors to ventilate before getting in, wait about half a minute after the engine starts before turning on the cooling—this is better for the car. During long traffic jams, it's advisable to open the windows for ventilation first, then close them and turn on the AC—it cools faster and saves fuel.

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