Although there are a few steps involved, bypassing the blower motor resistor is not a difficult task. The first thing you need to do is locate the resistor. It will be a small, flat, rectangular box mounted either to the firewall or the HVAC housing. Once you have found it, disconnect the negative battery cable to avoid electrocution.
Next, you need to disconnect the electrical connector from the resistor. This will usually be a small, round connector with two or three wires coming out of it. Once it is disconnected, you can remove the resistor by unscrewing the mounting screws and pulling it out.
The final step is to connect the two wires that previously went to the resistor directly to each other. You can do this by soldering the wires together or using a wiring connector. Once the connection is made, you can reinstall the negative battery cable and test the blower motor to make sure it is working properly.
If your blower motor does not seem to be working as well as it did before, you may need to replace the blower motor itself. However, if bypassing the blower motor resistor has resolved the issue, you should not have any further problems.
Frequently Asked Questions
What is a blower resistor used for?
A blower resistor is used for controlling the speed of the blower motor.
Where is the blower motor resistor located?
The blower motor resistor is located inside the dash, often on the opposite side of the steering wheel or inside the engine compartment on the firewall.
What happens when a blower motor resistor goes bad?
A blower motor resistor heats up due to current flowing through it, so when it fails, this heat can cause the resistor to fail. This usually results in a heater fan not working at all, or only running at high speed.
What part controls the speed of the blower motor?
A blower motor resistor controls the speed of the blower motor.
How does a blower motor resistor work?
A blower motor resistor works by controlling the speed of the blower motor. Previously, this control was simply done by changing the supplied voltage toward the blower motor. At present, this resistor is used to transmit a varied signal toward the motor. This resistor is inbuilt with different resistors including different resistances. The resistance value of this resistor will affect how quickly or slowly the blower motor will spin when powered.
