Why does the air conditioning automatically turn on when starting a BMW 525?

[JoelAnn]

The air conditioning in a BMW 525 automatically turns on upon startup primarily due to the parked car ventilation function, which is a comfort feature of BMW. After the vehicle has been stationary for an extended period, the air circulation system activates automatically when the driver enters the car, providing a sense of comfort. Here is some information about car air conditioning: 1. Definition of car air conditioning: The car air conditioning system is a device that cools, heats, ventilates, and purifies the air inside the cabin, providing a comfortable environment for passengers, reducing driver fatigue, and improving driving safety. 2. Application of car air conditioning: Most cars widely adopt an integrated heating and cooling air conditioning system. Its layout involves assembling components such as the evaporator, heater core, centrifugal blower, and control mechanism together, known as the air conditioning unit assembly.

[StHarper]

As a seasoned BMW 525 driver with years of experience, I've noticed that the air conditioning automatically turns on upon starting the car. This is actually the default setting of the vehicle's built-in intelligent air conditioning system. The BMW 525 is equipped with an automatic air conditioning feature that remembers the last settings after each shutdown. For example, if you last drove with the air conditioning on in AUTO mode, the system will automatically restart the air conditioning when you start the car again. This design is intended to quickly adjust the cabin temperature, especially during hot summers or cold winters, by pre-cooling or heating the interior. The underlying principle involves sensors detecting external temperatures to automatically activate the air conditioning, ensuring comfort as soon as you enter the car. If you're not accustomed to this feature, you can disable the auto-memory function in the settings or manually turn off the air conditioning before shutting down the engine. While this design is quite thoughtful, it may consume a bit more fuel, so it's important to regularly maintain the air conditioning filter to ensure efficient operation and prevent clogging.

[VonMaximus]

I've been using the BMW 525 for almost two years, and every time I start the ignition, the air conditioning turns on automatically. The reason lies in the vehicle's intelligent control system which retains user preferences. The 525 model's air conditioning is designed to automatically resume operation if it was turned on before the engine was shut off. Engineers likely implemented this feature to enhance user experience, such as pre-cooling the cabin or dehumidifying to prevent odors. In practical use, although it consumes slightly more electricity during startup, the overall feeling is comfortable and convenient. If you're concerned about the impact on the vehicle's battery, you can check the air conditioning settings to try disabling the automatic mode and switch to manual control, or verify if the external sensors are sensitive and accurate. Additionally, according to BMW's maintenance manual, it's crucial not to overlook regular cleaning of the air conditioning system to prevent dust buildup and maintain efficiency.

[VanGenesis]

I drove my brother's BMW 525, and the air conditioning always automatically turns on at startup, which feels pretty cool. As far as I know, this is a common feature in high-end models. The air conditioning settings default to restoring the last state, meaning the system will activate the air conditioning based on the configuration before shutdown, such as maintaining the AUTO mode for intelligent adjustment. Behind this, there might be an added temperature sensor that detects heat and automatically cools to ensure comfort upon entering the car. It's indeed convenient to use, but it's important to balance energy usage. For daily driving, simply adjusting the settings can turn off the automatic function without affecting the driving pleasure.