Why are the car lights on during the day?

2 Answers
ColinMarie
07/29/25 3:33am
The AC button in a car's air conditioning system refers to the switch for the vehicle's air conditioning compressor. The cold air produced by the car's air conditioning comes from the operation of the vehicle's air conditioning system, which requires the compressor to work. This means that only when the A/C button is pressed will the air conditioning compressor operate, and the air blown out by the blower will be cold. Unlike home air conditioning systems that generate heat, the heat in a car's air conditioning system comes from the engine's coolant. The coolant absorbs heat from the engine and is then blown into the car by the blower. Therefore, heating does not require the air conditioning compressor to be turned on. Note 1: The car's air conditioning system is generally inactive during winter. Before starting it, check whether the vehicle's air conditioning compressor starts normally and verify the cooling effect during operation. If it does not start or the cooling effect is unsatisfactory, take the vehicle to a service station for inspection. Note 2: The vehicle's air conditioning compressor is prone to sucking in dust and bacteria during operation. Therefore, it is necessary to regularly clean and disinfect the compressor to ensure the health of the vehicle's occupants.
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LaBarrett
08/12/25 7:22am
I remember driving for so many years, the headlights often staying on during the day is mainly because modern cars are equipped with automatic headlight systems. They use sensors to detect ambient light, and if it's cloudy, raining, or dark in a tunnel, the lights turn on automatically, which enhances driving safety, especially reducing accident risks on highways. Daytime running lights are also a mainstream design, preset in many cars from the factory, aimed at making it easier for other drivers to notice you and avoid rear-end collisions. Another common reason is driver carelessness in forgetting to turn off the lights, such as not switching to manual mode when parked, causing the lights to stay on. If this happens frequently, it might drain the battery, so it's advisable to check the switch or refer to the car manual for settings after parking. Overall, this is part of technological progress, and I quite appreciate it, as safety always comes first.
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