Is It Normal for the Engine to Shake at Idle When the AC Is On?
2 Answers
It is normal for the engine to shake at idle when the AC is on. At idle, the engine runs at a slower speed with lower torque, which may cause a feeling of weakness when powering the AC. The engine drives the compressor of the car's air conditioning system to produce cooling. The car air conditioning system, abbreviated as car AC, is used to adjust and control the temperature, humidity, air cleanliness, and airflow inside the car cabin to an optimal state. The functions of the AC are: 1. To adjust and control the temperature, humidity, air cleanliness, and airflow inside the car cabin to an optimal state; 2. To provide a comfortable riding environment for passengers, reduce travel fatigue, create good working conditions for the driver, and serve as a crucial ventilation device for ensuring safe driving.
It's actually quite common to experience slight shaking when idling with the air conditioning on. My car is five or six years old, and in summer when the AC is running, I can feel minor vibrations at idle. This happens because the compressor activation adds extra load to the engine, and the system automatically adjusts the RPM to balance power output. If the shaking is very slight, it's part of normal design and nothing to worry about. However, if the vibration becomes more pronounced or is accompanied by unusual noises, like noticeable steering wheel shaking, then there might be an issue. From my experience, older cars are more prone to this situation, usually caused by worn engine mounts or severe carbon buildup in the throttle body. I recommend getting regular check-ups at the shop, especially cleaning the throttle body during seasonal changes. Long-term neglect could affect engine lifespan or increase fuel consumption, but minor shaking doesn't require immediate repair and is generally safe for most urban driving conditions. In summary, assess the severity of the shaking before taking action - don't let small issues escalate.
