Will the car battery drain if the air conditioning is left on when the engine is turned off?
2 Answers
Leaving the car air conditioning on when the engine is turned off will continue to drain the battery. The reasons are as follows: 1. Key in the OFF position: It won't consume too much power. 2. Key in the OFF position: Prolonged use will cause excessive drain on the battery. Information about car air conditioning is as follows: 1. Car air conditioning: Refers to the air conditioning device installed in the car, which can cool, heat, ventilate, and purify the air inside the cabin, providing a comfortable environment for passengers, reducing driver fatigue, and improving driving safety. 2. Components: Generally includes cooling devices, heating devices, and ventilation devices. This integrated system makes full use of the limited space inside the car, with a simple structure and easy operation.
As a veteran taxi driver with twenty years of experience, I've encountered dead batteries causing failure to start way too many times. Let me tell you straight—leaving the AC on after turning off the engine absolutely drains the battery! The compressor stops, but the fan keeps whirring away. One summer, while waiting for a passenger with the engine off but AC blasting at full speed, my car wouldn't start after just half an hour. Old batteries are especially unforgiving—new ones might last two hours, but once the voltage drops below the starting threshold, you're in trouble. A mechanic once told me the blower draws over ten amps at full speed, comparable to leaving headlights on. Now I make it a habit to always turn off the AC switch and fan before shutting down the engine—same goes for defogger mode in winter.
