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What Happens If You Forget to Turn Off the Air Conditioner After the Car Is Turned Off?

3 Answers
McCollin
07/30/25 12:46am
Turning off the air conditioner before parking and shutting down the engine can help avoid negative impacts on the battery and the air conditioner's lifespan. It is best to turn off the air conditioner when preparing to park, allowing the remaining heat to dry the moisture in the evaporator box and eliminate the temperature difference with the outside environment. This relatively reduces air conditioner odors and maintains the relative dryness of the air conditioning system. The effects of not turning off the air conditioner when the car is turned off are: It can lead to odors when the air conditioner is turned on, which can only be resolved by disassembling and cleaning the evaporator box and air conditioning ducts. During the next startup, the air conditioner will run simultaneously with the compressor, increasing the load on the motor. When the air conditioner is running in summer, the system is in a cooling state, forming surface moisture that is blown into the air conditioning ducts by the air conditioner, resulting in high humidity inside the ducts. This promotes the growth of mold, leading to air conditioner odors. Precautions for using car air conditioners: Not using the air conditioner all winter: In some regions with mild winters, some car owners do not use the air conditioner at all. However, prolonged disuse can cause rubber seals to age, and the lubricating oil on internal components may dry out. Regularly starting the air conditioner ensures that all parts receive lubrication and remain in good condition. Adjusting air vent directions randomly: Some car owners do not pay attention to adjusting the direction of the air vents, which affects the optimal performance of the air conditioner. Based on the principle that cold air sinks and warm air rises, the correct approach is to direct the vents upward when cooling and downward when heating. Cleaning the air conditioner only when performance deteriorates: The air filter should be replaced periodically because dust accumulation can stick to the filter, breed bacteria, and produce musty odors. It is best to replace the filter at least once a year. Keeping the air conditioner on for extended periods: Some car owners often leave the air conditioner running continuously after starting the car. Prolonged use can increase the pressure on the condenser and damage the cooling system. Therefore, the air conditioner should not be used for excessively long periods each time. Immediately switching to recirculation mode upon entering the car: When first entering the car, windows should be opened for ventilation, and the external circulation mode should be activated. Only after all the interior air has been expelled should the recirculation mode be used. Keeping recirculation mode on for long periods: Since recirculation mode circulates air within the closed cabin, the oxygen level inside the car will continuously decrease. If gasoline in the cylinders is not fully burned, carbon monoxide from the engine may leak into the cabin, worsening air quality and potentially harming occupants.
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LaAnthony
08/15/25 6:00am
I've been repairing cars for over a decade, and I often see cases where owners forget to turn off the air conditioning, causing the car to fail to start the next day. After the engine is turned off, the air conditioning system still relies on the battery for power. The fan and the compressor's fan motor continue to operate, consuming a significant amount of electrical energy, which quickly drains the battery. The most immediate impact is that the engine won't turn over. Over time, this practice greatly shortens the battery's lifespan because deep discharges accelerate electrode corrosion, requiring a new battery every three to five years. Additionally, if the vehicle is parked indoors or in a high-temperature environment, the continuous operation of the fan can cause the electrical circuits to overheat, increasing the risk of a short circuit. I recommend developing a good habit: always turn off the air conditioning before shutting down the engine, and take a moment to check that the headlights and other accessories are also turned off to avoid unnecessary repair troubles.
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SanCollin
10/20/25 3:12am
I often drive out, and once I forgot to turn off the air conditioning, which resulted in the car not starting in the morning. I had to call a tow truck and wasted money. After the engine is turned off, the air conditioning fan keeps running, draining the battery in just a few hours. If the battery is old and performs poorly, this short time might already make it difficult to start the car. The key issue is that in summer or winter, the interior temperature control relies on the air conditioning. Forgetting to turn it off not only causes inconvenience but may also lead to other in-car devices like the navigation system or entertainment system consuming power as well. Now, I force myself to develop a habit: before parking, I take a quick glance at the air conditioning button to ensure it's turned off, avoiding a repeat of the same mistake. This simple action can save a lot of trouble.
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Can China 5 Vehicles Be Licensed After the Implementation of China 6 Standards?

After the implementation of China 6 standards, China 5 vehicles can no longer be licensed, but newly licensed China 5 vehicles can still continue to be used. Below is an introduction to China 5 and China 6: Introduction to China 6 Standards: Compared to China 5, China 6 standards impose stricter requirements on carbon monoxide, nitrogen oxides, and hydrocarbons in emissions. Additionally, China 6 standards include new regulations on PN particulate matter. Introduction to China 5 Standards: During the China 5 phase, emission standards for diesel and gasoline vehicles differed. However, China 6 adopts a fuel-neutral principle, meaning the emission limits are the same regardless of the fuel type. Differences Between China 6 and China 5: After the formal implementation of China 6 standards, the main impact will be on the production, import, sale, and registration of new vehicles. Existing China 5 vehicles will no longer be allowed to be registered or licensed. However, previously registered and licensed China 5 vehicles can still be used, will not affect normal annual inspections, and can be traded as used vehicles. The China 6 standard will be one of the strictest standards globally. After July 1, 2019, China 5 vehicles in most regions of the country will no longer be eligible for licensing, and many regions have already or will implement the China 6 standard ahead of schedule.
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What are the precautions for purchasing a new car?

When purchasing a new car, pay attention to the vehicle's manufacturing time, check the glass markings, and inspect the inner wall of the exhaust pipe. Check the vehicle's manufacturing time: On the nameplate of the co-driver's door, there is the vehicle's manufacturing date. For domestic cars, it should not exceed three months, and for imported cars, it should not exceed six months. Otherwise, it might be a stock car. Check the glass markings: Check if the glass markings are consistent with the original factory. The production date should not be later than the factory's date. The numbers represent the year, and the dots represent the month. If the dot is in front, subtract it from 7; if it's at the back, subtract it from 13. If the markings on all four glasses are different, it might be an accident car. Check the inner wall of the exhaust pipe: The mileage should preferably not exceed 50 kilometers. Inspect the inner wall of the exhaust pipe for any black traces. If it's noticeably black, it might be a test-drive car. Check the car paint under both direct and indirect light for scratches. Small dents should be repainted smoothly.
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Is a Power of Attorney Required for Out-of-Province Vehicle Annual Inspection?

Out-of-province vehicle annual inspection requires a power of attorney. Introduction to Vehicle Annual Inspection in Another Location: Vehicle annual inspection in another location refers to conducting the vehicle's annual inspection in a place other than where it was purchased. For example, if the owner purchases the vehicle and registers it in City A but primarily uses it in City B, this creates a situation of using the vehicle in a different location. Since vehicles require periodic inspections every few years, driving the vehicle back to City A for inspection can be very inconvenient. This leads to the need for an out-of-city vehicle inspection, meaning a vehicle registered in City A undergoes inspection in City B. Documents Required for Out-of-City Vehicle Inspection: First and foremost, the most important document is the Power of Attorney for Out-of-City Vehicle Inspection. When conducting an out-of-city vehicle inspection, you must first obtain this Power of Attorney, then bring it along with other relevant documents to the local vehicle management office where the inspection is to be performed. To apply for the Power of Attorney, you need to submit the owner's ID card, vehicle insurance documents, vehicle registration certificate, original and copy of the vehicle and vessel tax, and an application for out-of-city inspection to the vehicle management office in the registration location. During the inspection, you must bring the vehicle registration certificate, insurance documents, and the Power of Attorney to the designated vehicle management office. It is important to note that the vehicle undergoing inspection must not have any unresolved traffic violations.
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How many kilometers can the XPeng G3 electric vehicle run?

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Can Running a Red Light with Temporary License Plates Be Captured?

It can be captured. According to Article 90 of the Road Traffic Safety Law, motor vehicles that violate traffic signal lights will be given a warning or fined 200 yuan, along with 6 penalty points. Temporary license plates are paper-based motor vehicle license numbers that allow temporary road use. Traffic violation penalties are not related to temporary or formal license plates but are primarily imposed for illegal driving behavior. At least three photos are required to confirm running a red light: the vehicle has not left the stop line when the red light is on; the vehicle passes through the intersection when the red light is on; the vehicle has crossed the line and continues to move forward when the red light is on. Article 26 of the Road Traffic Safety Law: Traffic signal lights consist of red, green, and yellow lights. A red light indicates prohibition of passage, a green light indicates permission to pass, and a yellow light indicates a warning. Article 44: Motor vehicles passing through intersections shall proceed according to traffic signal lights, traffic signs, traffic markings, or the command of traffic police. Ways to avoid running a red light: When there are arrow signal lights, follow the arrow light; otherwise, follow the round light; When the red light is on, the front of the vehicle must not cross the stop line; When the yellow light is on, the front of the vehicle must not cross the stop line; When the green light just flashes, if the distance is close and the speed is fast, you should pass because braking may not stop the vehicle in time to avoid crossing the stop line; if the distance is far, the speed is slow, or the intersection is congested, you should stop; When driving in the city, develop the habit of looking for traffic lights whenever you see a crosswalk or stop line and approach an intersection.
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What Causes the Engine Fault Yellow Light to Stay On?

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