Does a blower motor resistor control the fan speed?

Does a blower motor resistor control the fan speed?

Blower motor resistors have several resistors with different resistances. This controls the current that runs through the blower motor. Each fan speed selection is connected to one or more of the resistors in the blower resistor assembly.

Where is the blower motor speed resistor located?

The heater blower motor resistor is often found beneath the dashboard. It is located in the heater and air conditioning compartment. It’s connected to the air conditioning system, where it can adjust the speed of the blower motor fan. It can also be found behind the glove box of some vehicles.

How do I adjust the fan speed on my blower?

You can increase or decrease the blower speed by slightly adjusting the pulley on the blower drive motor. To increase blower speed, slightly loosen the setscrew that holds the pulley to the driveshaft. Move or turn the pulley clockwise on the shaft one turn, then tighten setscrew.

How do I know if it’s the blower motor or the resistor?

Typically, if the fan will work on some speeds but not on others, the resistor is suspect. Okay, let’s say there’s no melting going on, but your fan doesn’t work on all speeds. Typically, if the fan will work on some speeds but not on others, the resistor is suspect.

Where is the blower motor switch located?

It’s located inside the dash, often on the opposite side of the steering wheel or inside the engine compartment on the firewall. A blower motor resistor or a blower motor control module is the part that controls the speed of the blower motor.

What happens if your blower motor relay is bad?

If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current from a bad relay will blow the fuse and cut power in order to protect the system.

How do I adjust the fan speed on my ECM motor?

For an ECM blower motor with wires exiting the module (shown above), the speed is changed at the control board by moving the colored wire terminals. Only 3 of the 5 colored wires may be used at a time. These three are connected to the “Cool”, “Heat”, and “Fan” terminals on the control board.

What happens when your blower motor resistor goes bad?

If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored.

How much does it cost to replace blower motor resistor?

The Best in Auto Repair The average cost for blower motor resistor replacement is between $112 and $143. Labor costs are estimated between $44 and $55 while parts are priced between $68 and $88. This range does not include taxes and fees, and does not factor in your specific vehicle or unique location.