How to Test a Ford Blower Motor Resistor

To test a ford blower motor resistor, start by testing a known good unit and checking to see if there are any differences between the two motors. If there are no differences, then you know that your Ford Blower Motor Resistor is bad and needs to be replaced.

A Ford Blower Motor Resistor is an important part of the air conditioning system that controls the speed of the fan. If it becomes defective, it can cause a variety of problems including overheating, malfunctioning, or a blown fuse.

 

How to Test a Ford Blower Motor Resistor

 

The Ford Blower Motor Resistor is a component that is used in the ventilation system of a car. When it malfunctions, the engine will not start, which brings up the question of “how to test a ford blower motor resistor“.

To test a Ford Blower Motor Resistor, connect a 12V battery and ground wire to the circuit with an alligator clip lead wire and one side of a voltmeter to each terminal and adjust its settings to measure 0 volts.

Measure the resistance between any two points on the circuit by connecting one side of a voltmeter to one point and the other side of the voltmeter to the next, the resistance should be between 3.5 and 56 ohms.

If your circuit is not working as it should, disconnect one side of the circuit with a voltmeter and measure its resistance. Should your measurements match the values on the table, your circuit is working correctly.

This method works for

  • Mercedes blower motor resistor test
  • 2013 f150 blower motor resistor test
  • 2010 f150 blower motor resistor test

 

Blower Motor Resistor Symptoms

 

A blower motor resistor is a device that controls the speed of an electric motor. It is also known as a speed controller and it helps to distribute power from the main motor to the fan.

If a blower motor resistor is bad, the heater fan only runs at high or some specific speed setting such as (4 or 5) and doesn’t work at low speeds. A bad blower motor resistor is enough to cause a heater fan to malfunction in some car makes.

When it malfunctions, there can be several symptoms including reduced airflow, increased noise, and even damage to the fan.

 

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Other Symptoms of Blower Motor Resistor Includes

 

  • Reduced airflow: The resistor may not be working properly or may have been damaged by water or other substances.
  • Increased noise: The resistor may be faulty or have been damaged by water or other substances.
  • Damage to fan: A broken fan can cause serious problems with your home, business, or vehicle.

 

How to Repair Blower Motor Resistor

 

The resistor is located inside the air conditioning system and can be found near the blower motor. When it gets broken, it can cause an engine stall condition and possibly damage other components in the vehicle’s electrical system.

To repair your car’s broken resistor, loosen it and simply clean any form of dirt on it using a brush then replace it and tighten it. This would work in some cases and might not if the motor is greatly damaged, at this point, you would have to replace it.

To replace a broken resistor, you will need to remove the blower motor assembly from your car so that you can get access to it. There are three bolts on top of the motor that holds it into place and loosen.

 

How to Test a Blower Motor Resistor with a Multimeter

 

To test a blower motor resistor, we need to use a multimeter. It is important to know how the resistor will react when we measure the voltage.

The voltage should be between 12V and 14V. If it is below 12V, then it means that there might be an issue with the wiring or the motor itself. At this point, the only options are for you, to inspect the wiring and fix any fault or call a professional to check it for you.

If it is found that the wiring is alright then it is automatically known that the motor resistor is broken and needs to be replaced. After replacing it, everything should go back to normal and start functioning the way it should.

 

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Can You Bypass a Blower Motor Resistor

 

If you have tried everything to fix the problem and can’t find a professional or replacement close, then you may need to bypass the blower motor until to get one. To bypass this safety feature, you will need a few tools and some knowledge of how car motors work.

So, can you bypass a blower motor resistor? The answer is yes you can hotwire a blower motor but it must be for short time, as it is a safety feature. But how do you bypass a blower motor resistor then?

 

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How to Bypass Blower Motor Resistor

 

Watch the video below to get started

 

Remember, the blower motor resistor is a safety feature that prevents the blower motor from rotating too quickly. If it detects that the airflow is too powerful, it will shut off the power to the motor.

This prevents any damage to your vehicle and keeps you safe when driving in traffic or on a highway. However, sometimes this safety feature can cause problems with your vehicle’s operation.

 

New Blower Motor Resistor Not Working

 

There have been situations whereby broken blower motors were replaced with new ones and the new ones were also not working. Even though this does not frequently happen, we can’t overlook the fact that it does, so what should you do if a new blower motor resistor refuses to work.

If a new blower motor resistor is not working, there are two possible reasons, one is either the new one is broken even before the replacement or the wiring is bad. Either way, let a professional test the new and be sure it’s okay and also inspect the wiring too.

Generally, corrosion or overheating are the two major reasons why blower motor resistor fails. In very few instances, blower motor resistor failure can be associated with an excessive electric current that can overheat and prematurely damage the blower motor resistor.

The cost of repairing a blower motor resistor varies depending on the type and size of the unit. The average cost to repair a blower motor resistor is around $100.

 

What Causes a Blower Motor Resistor to Go Out?

 

The blower motor resistor can go out for many reasons. When it goes out, the HVAC system will not work properly and may not be able to cool or heat the room as it should.

A Blower Motor Resistor goes out when the wire that connects the resistor to the blower motor becomes loose or broken. This can happen when the wire is too close to a sharp edge, like a screw, or when it is pulled on too hard.

When a Blower Motor Resistor goes out, the airflow stops, and your air conditioning might stop working. The resistor protects your furnace by turning it off before damage occurs.

 

How Many Ohms Should a Blower Motor Have?

 

Blower motors are classified as three-phase motors in North America and Europe, while they are classified as two-phase motors in Asia. The number of phases of the electric current is important because it determines the amount of power that can be generated by the motor.

 

 

The power rating for a blower motor is determined by the number of phases that make up the electrical current. The more phases there are, the more power can be generated and transferred to other system parts. This means that a blower motor with 3 phases will have 3 times more power than one with 2 phases.

As long as your blower motor resistor is working properly, it is safe to leave it connected for a long time. However, if you have a problem with your system and need to replace the resistor, you should take care when removing it from its original location.

 

Conclusion

A Ford blower motor resistor is a device that regulates the power output of an electric motor. This device consists of a resistor and a capacitor, which are connected in series.

There are two ways to test this component, the first way is to use an ohm meter, while the second way is to use a multimeter which I have discussed the full process in this article. If you have any questions on how to test a ford blower motor resistor please leave them in the comments section.

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