Is It Okay to Keep the Engine Running with the Air Conditioning On?

1 Answers
Matthew
07/30/25 8:51am
It is not recommended to keep the engine running with the air conditioning on for extended periods. The main concern with idling the engine while using the air conditioning is the engine temperature, especially in older vehicles equipped with mechanical fans. Mechanical fans are driven by the engine crankshaft, and at idle, the crankshaft rotates at a slower speed, causing the cooling fan to spin more slowly. Prolonged idling can lead to insufficient engine cooling, resulting in overheating. Below are the hazards of continuously running the air conditioning: 1. Health risks: Continuing to use the air conditioning after the vehicle has stopped can cause the engine to idle, leading to incomplete fuel combustion and the release of exhaust gases containing high levels of carbon monoxide. Since the interior space of the car is small, if the vehicle remains stationary with the air conditioning on and the windows closed, the air inside cannot circulate, leading to poor air quality. Additionally, if carbon monoxide from the exhaust leaks into the cabin, the concentration of toxic gases like carbon monoxide will rise, posing health risks to passengers. 2. Engine damage: Continuing to use the air conditioning after the vehicle has stopped can cause the engine to start with the air conditioning compressor engaged during the next ignition, increasing the load. Over time, this can cause damage to the engine.
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