A blower motor is a small electric motor typically installed below the dashboard or behind the glove compartment. Its primary task is to drive the fan blades to promote airflow. This motor can be a brushed DC motor (used in older models) or a brushless DC motor (widely used in newer models), the latter being more efficient and requiring less maintenance.
Working Principle
When you turn on the car’s air conditioning or heating system, the blower motor circuit sends a signal, usually via a relay and control module, to draw power from the car battery. The motor activates and begins to rotate, with its shaft passing through a circular wheel (called the blower motor fan or cage). As the motor rotates, it draws air in and pushes it through the HVAC system’s ducts. Depending on the climate control operation required, the fan directs the air through the heater core or evaporator. If the air passes through the heater, the temperature rises; if it passes through the evaporator, the temperature drops, eventually exiting through the air vents into the cabin.
