Does idling the engine with the air conditioning on consume more fuel?

[VanAndres]

Idling with the air conditioning on consumes more fuel. The principle of idling with the air conditioning on: The power output consumed by the air conditioning only accounts for a very small part of the engine's idling 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 vehicle is stationary, and keeping them running is a waste of power, which leads to significant fuel consumption. Health hazards: Running the air conditioning while the vehicle is stationary is very dangerous. When the engine is idling or running at low speeds, gasoline does not burn completely, producing carbon monoxide. If the air conditioning is in the external circulation mode, it will draw this carbon monoxide into the vehicle, potentially causing carbon monoxide poisoning for the occupants. This is especially risky during traffic jams, where the air conditioning intake may be directly facing the exhaust of the vehicle in front. Therefore, it is advisable to switch to the internal circulation mode during traffic congestion.