Can the car air conditioner be turned on when the engine is off?

[LeJuliana]

Yes, but turning on the air conditioner with the engine off will drain the battery. Here are the related details: 1. Risk one: A long-term undercharged battery can create driving hazards for consumers. It poses safety risks, affecting the brightness of headlights and the sound of the horn, which impacts safety. Secondly, it damages the car's powertrain. Multiple ignition attempts will greatly accelerate engine wear, potentially leading to poor engine starting, unstable idling, and sluggish acceleration. 2. Risk two: Thirdly, it harms onboard electronics. Unstable voltage can significantly affect electrical devices (GPS, audio systems, etc.), even causing equipment damage. Fourthly, it may result in the loss of computer data. A completely failed battery (power loss) can cause the loss of stored data in the car's computer, and re-unlocking is expensive, time-consuming, and labor-intensive. Lastly, it may lead to an inability to start the car, resulting in a breakdown on the road.