What are the hazards of idling the engine with the air conditioning on?

[Cora]

The hazards of idling the engine with the air conditioning on are as follows: 1. Leads to excessive carbon monoxide concentration: When the car's engine is running, if the gasoline in the cylinders does not burn completely, it can produce high concentrations of carbon monoxide. If the car is stationary with the air conditioning on and the windows are closed, the air inside the car cannot circulate. If carbon monoxide from the engine leaks into the car, it can gradually accumulate and increase in concentration, leading to poisoning or even death. 2. Causes long-term battery depletion: The blower is powered by the battery. When the car is idling, it does not necessarily charge the battery. Excessive power consumption by the blower can lead to long-term battery depletion. 3. Increases fuel consumption and engine carbon deposits: Running the air conditioning for long periods while the car is stationary, which is an idling state with the air conditioning on, will increase fuel consumption and also lead to more engine carbon deposits.