How do you bypass a blower motor resistor How Do You Bypass a Blower Motor Resistor

The blower motor resistor is a component in the heating and air conditioning system of a vehicle. It is responsible for regulating the speed of the blower motor, which circulates air through the ventilation system.

The blower motor resistor is typically located near the blower motor and has several terminals that connect to the electrical system of the vehicle. When the blower motor is turned on, the resistor receives electrical current and adjusts its resistance to regulate the speed of the blower motor.

This allows the driver to control the airflow and temperature in the vehicle. Without a functioning blower motor resistor, the blower motor would only operate at full speed, making it difficult to control the temperature and airflow in the vehicle.


How Do You Bypass a Blower Motor Resistor



To bypass the blower motor resistor, you can use a one-wire relay. Insert one end of the relay wire into the blower motor resistor point and to the other end too. You should only bypass a blower motor resistor in a short time or emergency only.

However, it is not recommended to bypass a blower motor resistor, as doing so can cause damage to the electrical system of your vehicle. The blower motor resistor is an important component that regulates the speed of the blower motor, which is responsible for circulating air through the heating and air conditioning system in your vehicle.

If the blower motor resistor is faulty, it is best to have it replaced by a certified mechanic. Tampering with the electrical system of your vehicle can be dangerous and should be avoided. A resistor is a device that limits the flow of electrical current.

A resistor is made up of two metal wires that are connected to an electric circuit. When electricity passes through the wires, heat is generated and the resistance increases. The purpose of a blower motor resistor is to limit the amount of air coming into your car’s engine and prevent it from overheating.

When you turn on your blower, it creates a voltage between its two terminals and this voltage makes contact with the resistor which then generates heat in order to reduce its resistance. This process creates a high-voltage arc between the terminals which then becomes too much for your car’s ignition coil to handle so it cuts off power to the coil and turns off your car’s engine.


What Causes Blower Motor Resistor to Fail


A blower motor resistor fails when it gets damaged or overheated. It can also fail if the wiring is short-circuited or there is a power surge.

The blower motor resistor is a vital part of the HVAC system. It controls the speed of the blower motor. The resistor is usually located in or near the blower compartment, and it can be accessed through a panel on the side of the compartment. The resistor is held in place by two screws on either side, and it’s held in place with wire clips.

The blower motor resistor can fail for various reasons, such as overheating from running for long periods at high speed or being hit by an object that damages it.

A lot of people don’t know that one of the most common causes for a blower motor resistor to fail is overheating from running at high speeds for long periods of time. This causes it to heat up and eventually fail because when this happens, it will no longer be able to regulate its temperature properly which will cause it to overheat more often.


Chevy Blower Motor Resistor Bypass


The resistor on your Chevy Blower Motor is designed to protect your vehicle from electrical current when you turn on the blower motor. However, if you find that your Chevy Blower Motor is not blowing properly, there are some things you can do to bypass this resistor and get it working again.

To bypass the Chevy Blower motor resistor, first, remove the negative battery terminal. Unscrew and remove the blower motor resistor from under the dashboard. Disconnect the electrical connector to the blower motor resistor. Remove the screws or bolts to the blower motor resistor and remove the resistor.



This bypass is used by many Chevy models, including all years of Chevy Avalanche, Silverado 1500, and GMC Sierra 2500 HD trucks. Bypassing the resistor on a Chevy Blower Motor is not recommended, as it can cause permanent damage to the motor.


How to Test a Car Blower Motor Resistor


The purpose of this device is to ensure that the battery does not overheat and it also protects your car from any fires. It can be found in most cars.

To test a blower with more resistors, you can use either an ohm’s meter or a multimeter, you can check my previous article on how to test a ford blower resister. The car blower motor resistor is a device that is used to convert alternating current (AC) into direct current (DC), it is used in cars to blow air in the car.


Watch the video for a better understanding


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Blower Motor Resistor Wiring Diagram


The diagram is a wiring diagram that helps you to understand how to wire a blower motor resistor. This diagram would be different from one car make to the other so check your user manual to see yours.

For the sake of illustrations use the diagram provided below.



The answer is Yes, a blower motor will work without the resistor, all you need to do is bypass it. If you have an old blower motor, you might want to know if it will work without the resistor.


How to Repair Blower Motor Resistor


Repairing a blower motor resistor typically involves identifying the faulty resistor and replacing it with a new one. Here is a general step-by-step guide on how to repair a blower motor resistor:

  1. First, locate the blower motor resistor. It is typically located near the blower motor itself, which is often found under the dashboard or under the hood of the vehicle.
  2. Once you have located the blower motor resistor, use a wiring diagram for your specific vehicle to identify the different terminals on the resistor.
  3. Disconnect the negative terminal of the battery to prevent any electrical shock.
  4. Disconnect the wiring harness from the blower motor resistor by carefully pulling it off the terminals. Be sure to label the wires so you know where they go when you reconnect them.
  5. Remove the mounting screws or bolts that hold the blower motor resistor in place, and then carefully remove the resistor from the vehicle.
  6. Install the new blower motor resistor by reversing the steps you used to remove the old one. Be sure to connect the wiring harness to the correct terminals on the new resistor, and tighten the mounting screws or bolts to secure it in place.
  7. Once the new blower motor resistor is installed, reconnect the negative terminal of the battery and test the blower motor to make sure it is working properly.

If you are unsure about how to repair a blower motor resistor, or if you encounter any difficulties during the process, it is always best to consult a professional mechanic for assistance.


Watch how to repair it in the video below


How to Bypass Blower Motor Resistor on Silverado


Blower Motor Resistor Silverado is a common problem in the Chevy Silverado 2003-2017. The resistor is located on the blower motor. It causes a rough running condition and can be bypassed by using an electric motor with a compatible speed.

To hotwire the blower motor resistor for Chevy Silverado, you need a DC motor, a couple of wires, and a stout switch or a relay would really be all you need. Unplug the resistor from under the dashboard and wire the motor up to your own activation system, just make sure to fuse things accordingly to keep it all safe

Another way to bypass by using an electric motor with a compatible speed, which means that you will need to find one that has the same RPM as the original blower motor. If you are unable to find an electric motor with the same RPM, you will need to mount your own electric motor on top of your old blower fan and use it instead of your original one.


Common Bad Blower Motor Resistor Symptoms


The symptoms of the bad Blower Motor Resistor can be different depending on the appliance. In some cases, it could be an issue with the wiring or an issue with the motor itself.

In order to properly diagnose and fix a Blower Motor Resistor issue, it is important to have some knowledge of what is going on inside your appliance. Below are the most common symptoms

  1. Blower motor only works on high speed:- When the blower motor resistor has failed, it is possible for the blower motor to be stuck on one setting. This component can prevent a lot of unnecessary energy consumption in your home or business.
  2. The Blower motor would not work in certain settings:- A faulty blower motor resistor can cause a blower to malfunction or stop working altogether. If an internal component in the part fails, there may be issues with the unit not functioning properly.
  3. No air from the vehicle’s vents:- A faulty blower motor resistor can result in airflow from the vehicle’s vents being cut off. A symptom of such a problem is no air coming out of the vehicle’s vents at all.




A blower motor resistor is a component that regulates the speed of the blower motor. The resistor is used to control the current passing through the motor so that it does not get too high or too low.

There are two types of blower motors: single-phase and three-phase. A single-phase blower motor uses a single power lead, while three-phase motors use two power leads.

This component can be bypassed by using a wire to connect the two terminals on the resistor, which will cause the blower to become non-functional. If you have any questions or need more clarification on how to bypass a blower motor resistor please ask using the comments section.

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