Is It a Problem to Keep the Car Running with AC On for a Long Time?

[DiMadelyn]

Keeping the car running with the air conditioning on has a slight impact on the engine, as it can lead to carbon buildup, causing the exhaust pipe tailpipe to accumulate carbon deposits and increasing fuel consumption. Although idling with the AC on does not cause significant harm to the car, it is still recommended to minimize such situations. How Car Air Conditioning Cooling Works: The compressor clutch engages, and the engine drives the compressor to operate. The compressor continuously compresses the refrigerant and delivers it to the evaporator. How Car Air Conditioning Heating Works: During heating, the high-temperature coolant from the engine flows into the heater core. At this time, the air blown by the blower may pass through the heater core, allowing warm air to be blown out from the car's air conditioning vents.

[DelCaden]

I think leaving the car idling with the AC on for too long can indeed cause problems, as I've seen many cases over decades of driving. The engine is already running, and when the AC is turned on, the compressor kicks in, increasing the engine's workload. Prolonged operation like this can easily lead to engine overheating or wear and tear. Especially during hot summer days, if you don't turn off the AC while parked, fuel consumption will skyrocket, wasting gasoline unnecessarily. Additionally, the battery will also be under stress, and if an older car's battery isn't in good condition, it might suddenly die and leave you stranded. I usually recommend not exceeding half an hour before turning it off to let the car rest, otherwise, repairs can be troublesome and costly with parts replacement. Regular maintenance is crucial to ensure both the AC system and coolant are functioning properly, as safe driving should always come first.

[Nancy]

As a car owner, I must say it's really not advisable to run the air conditioning for extended periods in the car. Operating the AC while the engine is running increases mechanical strain - it's like running while carrying extra weight, which can lead to overheating or malfunctions over time. Fuel consumption also rises quickly, putting a strain on your wallet. More importantly, there are safety concerns: if parked indoors or in enclosed spaces, exhaust fumes can accumulate, and with potential exhaust pipe issues, dangerous carbon monoxide could leak into the cabin - I've seen news reports about such accidents. It's better to drive with windows open for ventilation, take breaks every hour to check your vehicle's condition, and regularly maintain your AC filters to prevent minor issues from turning into major repairs.

[DeNadia]

Leaving the car idling with the AC on for too long can cause significant issues. It mainly increases the engine load, and if the compressor keeps running, the engine temperature can rise easily, especially in older vehicles, which are more prone to problems. In terms of fuel consumption, running the AC increases fuel usage by over 10%. While it's manageable for short distances, it's not cost-effective for long trips or extended idling. The battery may also be affected since the AC fan is electrically powered; an aging battery might suddenly die. I recommend limiting AC use to under 20 minutes and avoiding idling with the AC on—it's safer and saves money. Develop the habit of regular oil changes and AC system checks for a more worry-free driving experience.