What Happens If You Turn On the Car AC Without Starting the Engine?

1 Answers
DelRafael
07/30/25 7:10am
You can turn on the car AC without starting the engine. Here is the relevant information: For traditional fuel-powered vehicles: 1. Compressor working principle: The AC will only blow natural air from the blower, because the AC compressor is driven by the engine's power. When the car is turned off, the compressor naturally stops working. 2. Battery drain: The natural air blown by the blower is powered by the battery. Prolonged use of the blower may drain the battery over time. 3. Power cut after turning off the engine: Cars have a chain mechanism that automatically cuts off most auxiliary circuits after the engine is turned off, including the AC and blower.
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