What Causes the Car's Idle Speed to Fluctuate When the Air Conditioner is On?

[KateLynn]

It is generally normal for a car's idle speed to fluctuate when the air conditioner is turned on, but the frequency should also be considered. Observe how often the fluctuations occur. If the interval is one or two seconds, it indicates a malfunction in the air conditioning system. If necessary, replacing the oil seal can effectively improve this phenomenon. Below are some related details: 1. Introduction: The idle speed of the engine is referred to as the engine's idle speed, which can be adjusted by modifying the throttle size. 2. Function of Idle Speed: Idle speed is an operational state of the car, where the engine runs in neutral gear. When the accelerator pedal is released during engine operation, the engine enters idle mode. The idle speed should not fluctuate excessively, as it can cause wear and tear on the engine. A well-performing engine typically has an idle speed between 550 to 800 RPM. If the car's idle speed is problematic, it can lead to unusual engine noises.