What is the normal idle speed when the car's air conditioning is on?

[Lila]

When the car's air conditioning is on, the normal idle speed consumes approximately 1 liter of fuel per hour. Below is an introduction to car air conditioning: 1. Introduction: Car air conditioning refers to the air conditioning device installed in a vehicle. 2. Function: It can cool, heat, ventilate, and purify the air inside the cabin, providing a comfortable environment for passengers, reducing driver fatigue, and improving driving safety. The air conditioning system has become one of the indicators to measure whether a car is fully equipped. 3. Components: Generally includes a cooling device, heating device, and ventilation device. This combined system makes full use of the limited space inside the car, has a simple structure, and is easy to operate, making it a popular modern car air conditioning system internationally.

[DeLucy]

I've been driving for twenty years. Common issues like idling with the AC on generally range from 800 to 1000 RPM, depending on the car model. My old sedan usually idles at 700 RPM, and it jumps to around 900 RPM when the AC is on, which is quite stable. This happens because the AC compressor kicks in, adding a bit of load to the engine, and the engine automatically increases the RPM to maintain smooth operation. If the RPM fluctuates wildly or exceeds 1200 RPM, it could be due to a stuck idle control valve or an issue with the AC system, and you should get it checked at a repair shop promptly. I usually recommend having the technician take a quick look at the idle parameters during routine maintenance to avoid carbon buildup or sensor issues leading to higher fuel consumption or engine vibrations. New drivers often overlook this detail, but as long as the idle RPM stays within this range, there's nothing to worry about—just drive safely. It's always better than being stranded on the roadside waiting for a tow truck.

[MacSerenity]

I usually enjoy delving into automotive knowledge. When the car's air conditioning is on, the normal idle speed typically ranges between 750 to 950 rpm. Most household cars like Toyota or Honda have factory-set idle speeds around 700 rpm, but once the AC is turned on, the compressor draws power from the engine, causing the rpm to increase by 100 to 200 to compensate for the load. This happens because the ECU (Engine Control Unit) automatically adjusts the air intake to prevent stalling or shaking. If your tachometer shows a stable reading around 850 rpm, it indicates your car is in good health. However, if it surges above 1100 rpm or drops below 600 rpm, it could be due to high AC pressure, carbon buildup in the idle valve, or battery issues. I make it a habit to glance at the dashboard during startup and note any abnormalities, which helps the repair shop diagnose issues faster. Don’t underestimate this practice—it affects fuel efficiency and engine longevity.