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Blower Motor

What is a Blower Motor?

There are two motors in an HVAC system: a blower motor in the air handling unit, and a fan motor in the air conditioning condenser unit outside. 

The blower motor is responsible for pushing air through the vents of your vehicle's heating and air conditioning systems. Without it, the AC system will not be able to circulate any heated or cooled air inside the cabin.

They are electric motors that are attached to fans and used to move air through the HVAC system.

How does a Blower Motor work?

The operation of a blower motor is relatively simple. When voltage is applied to the electric motor, it spins. In turn, that causes the fan to spin. Since the motor assembly is bolted in place, typically inside a heater box, the fan is able to move relatively large volumes of air at high velocities.
There are a few different controls that are associated with blower motor operation. One typical control is a speed selector, which allows the speed of the motor to be turned up or down. This is typically accomplished through components like blower motor resistors and fan relays.
The airflow from the blower can also be channeled to either heat or cool the passenger compartment. 
When heat is desired, air flow from the blower motor is directed to pass through the heater core. That causes the air to heat up, and hot air is subsequently blown out of the air vents. When air conditioning is desired, the air flow is directed through the A/C evaporator instead of the heater core.

Components of a Blower Motor

The components of a blower motor are typically consist of:
  • a DC motor
  • a housing that can be bolted down
  • a fan 

and few other components to control its operation like:
  • a blower motor resistor
  • a fan relay

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