Why does the car idle speed fluctuate when the air conditioner is on?

[OKarter]

It is generally normal for a car's idle speed to fluctuate when the air conditioner is on, but the frequency should also be considered—observe how often the fluctuation occurs. If the interval is one or two seconds, it indicates a fault in the air conditioning system. Replacing the oil seal when necessary can effectively improve this phenomenon. Additional relevant information is as follows: 1. The idle speed of the engine is called the engine idle speed, which can be adjusted by modifying the throttle opening. 2. Idling is an operating condition of the car, where the engine runs in neutral gear. 3. When the accelerator pedal is released while the engine is running, the engine enters idle mode. The idle speed should not fluctuate excessively, as it can cause wear on the engine. 4. A well-performing engine typically idles between 550–800 RPM. If the car's idle speed is problematic, it may lead to unusual engine noises.