Is it okay to run the air conditioning with the engine on?
2 Answers
Turning off the engine and running the air conditioning relies entirely on the battery since the engine isn't working. Some cars may not be able to provide cooling, and even if they do, the cooling effect may be limited. Additionally, running the AC for extended periods in this state can damage the battery. Avoid running the air conditioning in poorly ventilated areas after parking to prevent carbon monoxide buildup, which can lead to oxygen deprivation and poisoning. Additional information: When the engine is running while the air conditioning is on, incomplete combustion of gasoline in the cylinders can produce high concentrations of carbon monoxide. While driving, the movement of air through the air conditioning system creates convection, keeping carbon monoxide levels inside the car low. However, if the car is stationary with the air conditioning running and the windows closed, the lack of air circulation can allow carbon monoxide from the engine to leak into the cabin and accumulate, potentially leading to poisoning or even death.
Of course you can turn on the air conditioning with the engine running. I've been driving for many years and often do this, especially during hot summers or long-distance drives. Car air conditioning is designed to work when the engine is running because it requires the engine's power to drive the compressor, which compresses the refrigerant and blows out cold air. If you don't start the engine, the air conditioning is completely useless. However, be careful not to idle with the air conditioning on for long periods while parked, as this can waste a lot of fuel, cause the engine temperature to rise faster, and increase the risk of wear and tear. For example, once I was waiting for someone in the suburbs with the engine idling and the air conditioning on, and after an hour, I noticed a significant increase in fuel consumption and even smelled a burning odor. I turned it off in time to avoid any issues. Additionally, you should never idle with the air conditioning on in enclosed spaces like underground garages, as the buildup of exhaust fumes can lead to dangerous carbon monoxide poisoning. I recommend using the air conditioning while driving, as it's the safest and most fuel-efficient option, and the cabin air refreshes faster. In short, as long as you use it reasonably, running the air conditioning with the engine on is fine—just don't abuse it to ensure driving safety and vehicle longevity.
