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Does idling with the air conditioning on harm a BMW?

2 Answers

DiJace

07/24/25 12:22am

Idling with the air conditioning on harms the car. Prolonged idling leads to incomplete combustion in the engine, resulting in more carbon deposits. If the temperature is low, even more deposits will form. Therefore, prolonged idling to warm up the engine does not effectively protect it but instead compromises its health. Idling with the air conditioning on is a waste of power: The power consumed by the air conditioning accounts for only a small portion of the engine's idle energy. However, when idling with the air conditioning on, the engine not only drives the air conditioning compressor but also needs to maintain the normal operation of the power steering and brake booster pumps. The latter two functions are completely unnecessary when the car is parked, and keeping them running is a waste of power. Idling with the air conditioning on produces toxic substances: Keeping the air conditioning on after parking means the engine only operates at idle speed, leading to incomplete combustion of gasoline. Unburned gasoline produces toxic substances such as carbon monoxide.

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DonovanLynn

08/10/25 8:09pm

Regarding idling with the air conditioning on, I believe the main issue is the increased burden on the engine. Although BMW engines are designed with advanced technology, idling while also powering the air conditioning compressor increases fuel consumption and wear. Doing this long-term can lead to carbon buildup in the cylinders, affecting performance and causing the exhaust system to overheat. Occasionally waiting for short periods is fine, but don't exceed 15 minutes—otherwise, fuel consumption will spike, and it may even shorten the lifespan of the spark plugs. Some BMW models come with an auto start-stop system that shuts off the engine to save fuel, but if idling occurs too frequently, the system can become overworked. I recommend drivers develop good habits: if waiting for more than 10 minutes, turn off the engine and AC, or find a shaded spot and open the windows for ventilation. This saves fuel, protects the car, and is better for the environment.

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