What is the reason for the engine speed not decreasing after turning on the air conditioning?

[LaBrandon]

The reason for the engine speed not decreasing after turning on the air conditioning is: throttle valve sticking caused by excessive carbon deposits. Functions of air conditioning: 1. Achieves cooling effect through continuous circulation and transformation of refrigerant; 2. Draws in fresh external air for ventilation and air exchange, preventing windshield fogging; 3. Uses engine coolant, waste heat, or heat generated by a burner as a heating source, which is then heated by the heater and blown into the cabin by the blower to raise the temperature for heating effect; 4. Removes dust, odors, smoke, and toxic gases from the cabin air, freshens the cabin air, and humidifies the cabin air to increase relative humidity.