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The blower motor is part of your vehicle’s heating, ventilation, and air conditioning (HVAC) system. The blower is an electrical fan assembly mounted in the HVAC ducts below the dashboard ahead of the glove box.
Whenever you operate the vent, heat, or air conditioner, the blower motor forces air through the vents at one of a number of speed settings. When you select a fan speed, a resistor in the electrical pathway of the blower motor alters the amount of electrical current flowing to the blower motor in response to your selection.
In combination with another device, the blend door, the blower motor is able to bring air of different temperatures into the cabin. When you choose the heat setting, the blower motor sends air across the hot heater core in the system. If you choose cool air from the air conditioner, the blend door changes the path of the air flow and allows it to pass over the cold evaporator instead.
HOW IS THIS SERVICE PERFORMED?
How is a a Blower Motor Replacement done?
Due to its location underneath the dashboard and ahead of the glove box, it is necessary for a technician to access the inside of your vehicle for blower motor replacement. The glove box must be removed and lower dash components disassembled. From there, a technician will take the following general steps to remove the blower motor housing and replace the blower motor:
Unplug the wires connected to the blower motor housing
Remove the fasteners that hold the blower motor housing in place
Extract the housing from the HVAC system
Remove the blower motor from the housing and insert the new motor
Reinstall the housing and plug in the electrical wires
Reinstall the dashboard components and glove box
The blower motors in some vehicles are mounted in other locations, such as ahead of the center console. Some require a significant amount of disassembly to access it and several hours to complete the service. And some older vehicles place the blower motor in the engine compartment.
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National average cost of a a Blower Motor Replacement for popular vehicles:
Car Model
Avg. cost
$50
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How do I know if my vehicle needs the blower motor replaced?
When a blower motor fails, one of two problems occur. In one case, the air coming from the vents, warm or cool, does not come out with any force. The heater might still work, and the air conditioner might still cool, but the pressure from the vents is significantly reduced. Regardless of what fan speed setting you select, the air simply does not blow from the vents. In this case, the fan motor might be faulty.
In the other case, the fan refuses to work on one or more of its speed settings. For instance, it might blow when you select the highest speed setting, but not on lower settings. This would indicate that the resistor might be bad.
Problems with air flow can also point to other issues, such as a bad relay, blown fuse, or even a clogged cabin air filter.
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Other questions customers ask
How do I know if I need to replace the blower motor or the blower motor resistor?
One way to tell that the blower motor resistor is faulty (rather than the blower motor itself) is when the fan runs on some speed settings but not on others. If the blower motor fails, it will usually fail to function at all, whereas a bad resistor is often intermittent or partially impaired.
Why does the fan in my car only work on high?
The blower motor resistor changes the amount of electrical current that flows to the blower motor. “High” speed is the normal amount of current, and the lower speeds are due to designated degrees of electrical resistance. If the resistor fails, it is possible for the electrical signal to bypass the resistor in its normal “high” state. This results in a fan speed that only runs on high and is unresponsive to other settings.
What causes blower motor relay failure?
Blower motor relay failure is usually caused by one of three things: overheating, corrosion (which can lead to overheating), and too much current coming from a bad blower motor (which can also cause overheating). In each case, the resistor can seize up inside and fail to respond to input from the control circuit.
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