Why does the idle speed increase when the car's air conditioning is turned on?

[WalterLynn]

When the air conditioning is turned on, the engine requires additional power to drive the compressor, which causes the idle speed to increase. Here are the reasons why the air conditioning may not cool properly: 1. Internal damage: Severe internal wear of the compressor can prevent it from functioning normally. 2. Oil stains: The presence of oil stains at connections or seams indicates refrigerant leakage, and the relevant parts should be tightened or replaced. 3. Electrical system failure: Electrical system failures are also a common reason why the car's air conditioning compressor may not work properly. You can check if the circuit is functioning smoothly, inspect the temperature sensor solenoid valve, and look for other potential faults.