Does leaving the car running with the AC on damage the vehicle?

[JosephineDella]

Yes, it can cause damage. It easily leads to carbon buildup in the cylinders and throttle body, and also increases fuel consumption. Here is relevant information: Hazards: When the engine idles, due to incomplete fuel combustion, the exhaust often contains a large amount of carbon monoxide. The carbon monoxide emitted with the exhaust may accumulate around the vehicle and enter the interior through the AC system. Additionally, with the AC on and windows closed, the air does not circulate. Over time, the concentration of carbon monoxide inside the car will increase, posing a risk to human health. Precautions: Idling the car with the AC on results in higher fuel consumption. On the other hand, it wastes gasoline and can also cause significant damage to the engine and battery. During seasons when the AC is used frequently, it is advisable to clean and disinfect the AC ducts more often to improve cooling efficiency. Develop a good habit of turning off the AC before shutting down the engine.