What are the effects of leaving the car air conditioner on overnight?

2 Answers
DelLucia
07/30/25 12:17am
Leaving the car air conditioner running overnight while the engine is on can cause damage to the vehicle. Below is relevant information about the car air conditioning system: 1. Introduction to Car Air Conditioning: The car air conditioning system consists of a compressor, condenser, throttle element, evaporator, fan, and necessary control components. It is designed to regulate the temperature and humidity inside the car, providing a comfortable environment for the driver. 2. Working Principle: When the compressor operates, it draws in low-temperature, low-pressure gaseous refrigerant from the evaporator. After compression, the temperature and pressure of the refrigerant increase, and it is sent to the condenser. Inside the condenser, the high-temperature, high-pressure gaseous refrigerant transfers heat to the outside air passing through the condenser, causing it to liquefy into a liquid. When the liquid refrigerant flows through the throttle device, its temperature and pressure decrease, and it enters the evaporator. Inside the evaporator, the low-temperature, low-pressure liquid refrigerant absorbs heat from the air passing through the evaporator, causing it to evaporate into a gas. The gas is then drawn back into the compressor for the next cycle.
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DelJake
08/16/25 4:36am
Once I left the air conditioning on overnight in my car, and the next day the car wouldn't start at all. It turns out that running the AC all night consumes a lot of fuel, as the engine keeps running, burning through gasoline and causing unnecessary wear and tear. The battery was also nearly drained from prolonged power supply, and I had to spend time recharging it later. Honestly, this habit is both wasteful and environmentally unfriendly. Now I only use the AC while driving and turn it off when parked.
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