Does idling the car with the AC on damage the engine?
2 Answers
Running the AC while idling for short periods does not harm the car, but it consumes gasoline and leads to carbon buildup, which can damage the engine over time. Additionally, idling with the AC on is dangerous as it may cause suffocation. Idling consumes gasoline, similar to being stuck in traffic. The catalytic converter does not operate fully, polluting the air. Prolonged idling results in incomplete combustion, producing more carbon deposits, especially at lower temperatures. Thus, long-term idling does not effectively protect the engine but rather compromises its health. When the car's engine is running, incomplete combustion of gasoline in the cylinders produces high concentrations of carbon monoxide. While driving, air convection through the AC system keeps carbon monoxide levels low inside the car. However, when the car is stationary with the AC on and windows closed, air cannot circulate. If carbon monoxide from the exhaust leaks into the cabin, it accumulates, increasing the risk of poisoning or even suffocation. Therefore, avoid running the AC in poorly ventilated areas to prevent carbon monoxide buildup and oxygen deprivation. It is advisable not to idle the engine with the AC on for extended periods. Not only does it wear the engine, but prolonged AC use in recirculation mode gradually deteriorates air quality inside the car, increasing harmful gases (carbon monoxide, nitrogen oxides, etc.), which can endanger health and even life.
Does idling the car with the AC on damage the engine? Short periods are fine, like waiting a few minutes at traffic lights or picking someone up. The AC compressor adds some load, but engines are designed to handle this. However, prolonged idling is problematic. The engine runs at low RPM, leading to increased fuel consumption, poor heat dissipation, internal carbon buildup affecting performance, and accelerated wear on hot components. I once saw a neighbor who frequently idled with the AC on, resulting in clogged spark plugs and costly repairs. It's recommended to turn off the AC when parked, use window ventilation or a fan instead, to protect the car and save fuel.
