Can the air conditioning be turned on when the engine is off?

[AubreyRose]

The air conditioning can be turned on after the engine is off. However, there is no cooling function, and prolonged use can easily lead to battery depletion. Here is the relevant information: Impact on the engine: When starting, the compressor does not rotate, so it does not add unnecessary load to the starter. When the vehicle starts, almost all electrical appliances on the car are in a power-off state, with all current and voltage concentrated on the starter. The air conditioning panel also has no power, so the compressor naturally does not start. Evaporator box: There is a slight impact on the evaporator box. If the air conditioning is not turned off in advance, water will remain on the evaporator box. The evaporator box is enclosed in a sealed compartment, making it difficult for the water to evaporate naturally, requiring a long time. Due to the dark and humid environment, mold can grow over time, leading to odors and even affecting health.