Why does the car idle unstably after turning on the air conditioning?

[MacKarter]

When the air conditioning is turned on, the compressor also starts working, and since the compressor is driven by the engine, its operation increases the engine's load. Here are the specific explanations: 1. Insufficient power: For most electronic throttle systems, the engine will automatically increase the throttle opening to draw in more air, thereby boosting power output. If your car has been in use for a while, carbon deposits may accumulate in the throttle due to lack of maintenance, obstructing the engine's air intake. This can lead to insufficient engine power or barely enough to drive the compressor, resulting in unstable idle speed that fluctuates when the air conditioning is on. 2. Component failure: If your car is new and the throttle is unlikely to have carbon deposits this early, other components might be faulty, such as the mass airflow sensor or fuel injectors. This can cause the engine control unit to mistakenly perceive a temporary high load and attempt to compensate by increasing the RPM. When the engine speed drops, it can no longer handle the load from the air conditioning compressor and will raise the RPM again. This back-and-forth struggle manifests as unstable idle speed.