What is the role of the blower in a car's air conditioning system?

[Luna]

The function of the car blower is to blow the cold air from the air conditioning evaporator or the hot air from the heater core into the car. Simply put, the blower serves to deliver air. Below is an introduction to the control principles of the blower: 1. Automatic control: When the "Auto" switch on the air conditioning control panel is pressed, the car's computer automatically adjusts the blower's speed according to the required output air temperature. When the airflow direction is set to "Face" or "Bi-Level" and the blower is in low-speed mode, the blower speed will vary within a set range based on the intensity of sunlight. 2. Low-speed control operation: During low-speed control, the car's computer cuts off the base voltage of the power transistor, which in turn disconnects the power transistor and the high-speed relay. Current flows from the blower motor to the blower resistor and then to ground, causing the motor to operate at low speed.