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Why does the idle speed not increase when the air conditioning is turned on?

2 Answers

ElainaLee

07/25/25 3:13am

If the idle speed does not increase when the air conditioning is turned on, you need to check whether there is an issue with the car's idle speed motor. If the idle speed does not increase and there is no shaking, it indicates that the car is functioning normally. In summer, when the car's air conditioning is turned on, it is normal for the idle speed to increase. If the air conditioning's cooling effect is normal, whether the idle speed increases or not has minimal impact on the car, so you can drive with peace of mind. Here are some relevant details: 1. When the air conditioning is turned on in summer, because the compressor is working, the load on the car's engine will increase accordingly, and fuel consumption will also rise. It is important to note that after starting the car, you should not immediately turn on the air conditioning. Doing so not only fails to quickly lower the temperature inside the car but can also damage the engine to some extent. 2. Running the air conditioning at idle speed also has a significant impact on the car. It not only affects the normal use of the car but can also harm human health. In fact, prolonged idling in one place causes wear and tear on the car itself and can easily lead to carbon buildup inside the engine. Using the air conditioning while idling not only adversely affects the engine's cooling system, battery system, and the entire air conditioning system but can also allow carbon monoxide to enter the car, posing health risks to the occupants.

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VonLucia

08/10/25 4:54pm

Back when I drove my old car, the idle speed would always rise a bit with the AC on, which was normal compensation. But now with my decade-old car, there was this one time when the idle speed didn't budge at all with the AC on, and no cold air came out either, which got me worried. I checked the compressor belt - it wasn't slipping, but when I pressed the AC button, the light didn't come on. That's when I realized the circuit fuse had blown. After replacing the fuse, it worked fine again. If the compressor isn't working, there's insufficient refrigerant, or the idle control valve is stuck, similar issues could occur. When idle speed doesn't increase as it should, it's actually abnormal and can put extra strain on the engine, potentially causing stalling over time. For safety's sake, I'd recommend checking the AC switch signal and electronic control system - better to address it before it becomes a bigger problem.

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