How to test the blower motor resistor? Symptoms of bad blower motor resistor new for 2022

How to test the blower motor resistor?

Have you ever ask yourself that can you test a blower motor resistor? The answer is yes. Here is the steps which help you do an accurate and easy way:

How to test a blower motor resistor with a multimeter

You will need to gather the following tools:

-A multimeter

-The wiring diagram for your car (optional)

Instruction

If you don’t have a wiring diagram for your car, you can usually find one online or in a service manual. Once you have all of the necessary tools, you can begin testing the blower motor resistor.

Testing the blower motor resistor is a relatively simple process.

Step 1: you will need to locate the resistor. In most cases, it will be mounted on or near the blower motor. Once you have found the resistor, you will need to test it for continuity.

Step 2: To test for continuity, you will need to set your multimeter to the “ohms” setting.

Step 3: Then, you will need to touch one lead of the multimeter to each terminal on the resistor.

-If the reading on the multimeter is zero or close to zero, then the resistor is good and there is no need to replace it.

-If the reading on the multimeter is infinity or very high, then the resistor is bad and needs to be replaced.

Test the blower motor resistor with a test light

Tool

-A test light

-The wiring diagram for your car (optional)

Instructions

If you don’t have a multimeter, you can test the blower motor resistor with a test light.

Step 1: you will need to locate the resistor. In most cases, it will be mounted on or near the blower motor. Once you have found the resistor, you will need to test it for continuity.

Step 2: To test for continuity, you will need to connect one lead of the test light to ground and the other lead to each terminal on the resistor.

-If the test light lights up, then the resistor is good and there is no need to replace it.

-If the test light does not light up, then the resistor is bad and needs to be replaced.

Testing the blower motor resistor is a relatively simple process. With the proper tools, you can easily test the resistor and determine if it needs to be replaced.

What is a blower motor resistor?

A blower motor resistor is a component of the heating and cooling system in your car. The blower motor resistor is responsible for controlling the speed of the blower motor.

When the blower motor resistor fails, it can cause the blower motor to run at one speed or the other. In some cases, the blower motor may not run at all.

How does a blower motor resistor of the car work?

The blower motor resistor is located in the car’s dash and is usually mounted on or near the blower motor. The resistor is connected to the blower motor by a series of wires.

When the ignition switch is turned on, voltage is sent to the blower motor resistor. The resistor then controls the amount of voltage that is sent to the blower motor.

The resistor is responsible for controlling the speed of the blower motor.

Symptoms of bad blower motor resistor

The blower only operates at higher speeds.

One of the first symptoms commonly associated with a bad or failing blower motor resistor is a blower motor that only works on certain speeds. If the resistor is faulty, it may only allow the current to flow through certain circuits, which will limit the blower motor’s speed.

Systems allow for relatively little ventilation.

When the blower motor resistor fails, you will notice that the airflow from the vents is insufficient.

Thus, if you notice that when you switch on the air conditioning or heating system, the air is not as powerful as it used to be, you should inspect the air blower motor, as it might be the source of the issue.

The air blower motor may wear out or get weaker over time, limiting the proper quantity of air from flowing through the vents. This is a clear indication that the blower motor resistor has reached the end of its useful life.

The blower motor doesn’t work at all

Another symptom of a bad or failing blower motor resistor is a blower motor that does not work at all. If the resistor is completely failed, it will prevent any current from flowing to the blower motor, and as a result, the blower motor will not operate.

The vents do not produce any air.

In certain cases, a faulty resistor will prohibit electricity from reaching the blower motor at all. The motor will not operate if there is no electricity. As a consequence, the blower fan remains stationary and quiet, and no air flows through the vents.

This symptom may also be caused by a failing blower fan or a variety of other difficulties, such as:

-Burned connections or a blown thermal fuse

-Fuse or circuit breaker failure

-Switch or wiring failure

-Unfavorable terrain

What are the reasons of a blower motor resistor failure?

There are a number of reasons that the blower motor resistor may fail.

The most common reason for failure is due to excessive resistance in the circuit. When the blower motor resistor has too much resistance, it can cause the electrical current to overheat. This will eventually lead to the resistor burning out.

Other reasons for blower motor resistor failure can include:

-A build-up of dirt or debris on the resistor

-Excessive vibration

-Corrosion

-Failure of the connector terminals

How much does it cost to replace the blower motor resistor?

The cost of replacing the blower motor resistor will vary depending on the make and model of your car. The average cost for a blower motor resistor replacement is between $100 and $200.

If you need to replace the blower motor resistor, it is important to use only a high-quality replacement part. Using a lower quality part can lead to increased resistance and premature failure.

FAQs how to test the blower motor resistor?

How many Ohms should a blower motor resistor have?

It should be approximately 4 – 5 ohms, according to the service handbook. In our scenario, the ohmmeter indicates an open circuit, indicating that the resistor has failed. A blower motor resistor might fail owing to issues with the blower motor itself.

Will a blower motor function without a resistor?

The motor will not operate if there is no electricity. As a consequence, the blower fan remains stationary and quiet, and no air flows through the vents. In certain cases, a faulty resistor will prohibit electricity from reaching the blower motor at all.

Can you bypass blower motor resistor?

The blower motor is powered by the car’s battery in the quickest speed setting. In this position, the blower resistor is bypassed completely, allowing for maximum current to flow through the motor. The blower motor resistor supplies power to the blower engine; if it fails or has any issues, power can be sent to the motor.

Conclusion

Although it’s not a complicated part, the blower motor resistor can cause big problems if it fails. Fortunately, testing it is easy and doesn’t require any expensive tools or equipment. If you think your blower motor resistor might be bad, give this test a try. We provided how to test resistor for blower motor on above article. If you have any questions, our team from amortips.com is here to assist you.

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