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Should You Turn Off the Air Conditioning When Exiting the Car?

2 Answers

LaOlive

07/29/25 12:55am

You should turn off the air conditioning when exiting the car. Here are the reasons why you should turn off the air conditioning when exiting the car: Reason 1: After the engine is turned off, it cannot drive the compressor, so the air conditioning cannot provide cooling. Keeping the air conditioning on after turning off the engine will reduce the battery's lifespan. Reason 2: The air conditioning increases the load when starting the car. Reason 3: Moisture and mold in the air conditioning ducts can cause unpleasant odors in the car. Turning off the air conditioning 1-2 minutes before parking allows a large amount of outside air to dry the ducts, preventing musty odors caused by moisture and mold.

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StMadison

08/12/25 5:05am

As a veteran driver, here's a little tip for everyone: it's best to manually turn off the AC button before shutting off the engine. I've seen too many people stop the car, pull out the key, and walk away, resulting in the air conditioning compressor running along with the engine the next time the car is started, putting a lot of strain on the battery. Especially for older cars, doing this a few times can easily lead to a dead battery and the car stalling. Additionally, moisture can accumulate in the air conditioning pipes after the engine is turned off, which can lead to mold over time, causing a musty smell when the AC is turned on. I've developed the habit of turning off the AC when I'm about 200-300 meters away from my destination, letting the fan dry out the pipes. This way, the cabin stays cool for a while after shutting off the engine, protecting the battery and extending the life of the air conditioning system.

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