Blower motor resistors are small however important elements in your HVAC system. They regulate the pace of the blower motor, which in flip impacts the airflow all through your property. Over time, blower motor resistors can fail, resulting in quite a lot of issues, together with decreased airflow, overheating, and even electrical fires. Happily, changing a blower motor resistor is a comparatively easy and cheap activity that may be accomplished in a couple of hours.
Step one is to determine the placement of the blower motor resistor. It’s sometimes positioned within the blower compartment, which is normally discovered close to the furnace or air handler. Upon getting positioned the blower motor resistor, you have to to disconnect the facility to the HVAC system. This may be carried out by turning off the circuit breaker or fuse that provides energy to the system. Subsequent, take away the quilt of the blower compartment and find the blower motor resistor. It’s sometimes hooked up to the blower motor with a couple of screws.
Upon getting positioned the blower motor resistor, you have to to disconnect the wires which can be linked to it. You should definitely label the wires so as to reconnect them appropriately later. As soon as the wires are disconnected, you may take away the blower motor resistor from the blower motor. The brand new blower motor resistor can then be put in within the reverse order of the elimination course of. You should definitely tighten the screws that safe the blower motor resistor to the blower motor and reconnect the wires. Lastly, activate the facility to the HVAC system and check the blower motor to ensure that it’s working correctly.
Assessing the Blower Motor Resistor Harm
Diagnosing a defective blower motor resistor requires a scientific strategy. Listed below are some key steps to observe:
1. Troubleshooting the Blower Motor:
Earlier than delving into the resistor, make sure the blower motor itself is functioning correctly. Verify if the motor is receiving energy by connecting a multimeter to its leads. If there is no energy, examine the wiring and connections for any faults.
2. Figuring out the Resistor Location:
Find the blower motor resistor, sometimes positioned close to the motor or contained in the HVAC management module. Seek advice from the automobile’s service handbook or on-line sources for particular directions on its location. The resistor normally has a number of terminals and a definite form, making it straightforward to determine.
| Fault Description | Potential Causes |
|---|---|
| No air move from any pace setting | Defective blower motor or resistor |
| Fluctuating air flowDefective resistor or intermittent connection | |
| Air move solely on excessive pace | Open circuit in resistor or wiring situation |
3. Visible Inspection:
Fastidiously examine the resistor for any seen indicators of harm, akin to burn marks, cracks, or unfastened connections. A burnt resistor sometimes signifies a brief circuit, whereas unfastened connections could cause intermittent airflow points.
4. Electrical Testing:
Use a multimeter to measure the resistance throughout the resistor terminals. Examine the measured worth with the specs supplied within the automobile’s handbook. A major deviation from the required worth signifies a defective resistor.
Instruments Required for Alternative
Changing a blower motor resistor requires a couple of fundamental instruments. This is what you will want:
Flashlight
A flashlight is important for illuminating the work space, particularly in case you’re working in a dimly lit space or below the dashboard.
Screwdriver (Phillips head)
You may want a Phillips head screwdriver to take away the screws that safe the blower motor resistor in place.
Wrench (10mm)
A 10mm wrench is required to loosen the nuts that maintain {the electrical} connectors in place.
Electrical tape
To make sure a safe and weatherproof connection, you will want electrical tape to wrap across the wire connectors after reattaching them.
Gloves
To guard your palms from sharp edges or electrical elements, it is really useful to put on gloves whereas dealing with the blower motor resistor.
Digital multimeter (elective)
A digital multimeter can be utilized to check the continuity of the blower motor resistor and guarantee it is functioning correctly earlier than putting in it.
Security glasses
To guard your eyes from flying particles or electrical sparks, it is advisable to put on security glasses when working with electrical elements.
Extra Ideas for Utilizing a Multimeter
In the event you’re utilizing a digital multimeter to check the blower motor resistor, listed below are a couple of extra ideas:
| – Set the multimeter to the ohms scale. |
| – Contact the probes to the terminals of the resistor. |
| – A studying of 0 ohms signifies a brief circuit, whereas a studying of infinity signifies an open circuit. |
| – If the studying is inside the specified vary for the resistor, it is thought of purposeful. |
Eradicating the Blower Motor Housing
To entry the blower motor resistor, it’s good to take away the blower motor housing. This is usually a tough course of, so it is essential to observe these steps rigorously.
1. Disconnect the Damaging Battery Terminal
Security first! Earlier than you begin engaged on the blower motor, disconnect the detrimental battery terminal. This can forestall any electrical accidents.
2. Find the Blower Motor Housing
The blower motor housing is normally positioned below the dashboard, on the passenger aspect of the automobile. It is a rectangular field with a couple of wires and hoses linked to it.
3. Take away the Screws
Use a screwdriver to take away the screws that maintain the blower motor housing in place. There could also be a number of screws, so you should definitely get all of them.
4. Disconnect the Wires and Hoses
As soon as the screws are eliminated, it’s good to disconnect the wires and hoses which can be linked to the blower motor housing. Watch out to not harm any of the connectors.
5. Take away the Blower Motor Housing
As soon as the wires and hoses are disconnected, you may gently pull the blower motor housing out of its place. Watch out to not drop it or harm any of the elements.
6. Find the Blower Motor Resistor
The blower motor resistor is normally positioned contained in the blower motor housing. It is a small, rectangular part with a couple of wires linked to it. To take away the blower motor resistor, it’s good to:
- Disconnect the wires from the blower motor resistor.
- Take away the screws that maintain the blower motor resistor in place.
- Pull the blower motor resistor out of its socket.
Upon getting eliminated the blower motor resistor, you may set up the brand new one as an alternative. You should definitely join the wires and hoses correctly, after which reinstall the blower motor housing.
| Step | Description |
|---|---|
| 1 | Disconnect the detrimental battery terminal. |
| 2 | Find the blower motor housing. |
| 3 | Take away the screws. |
| 4 | Disconnect the wires and hoses. |
| 5 | Take away the blower motor housing. |
| 6 | Find the blower motor resistor. |
Restoring Electrical Energy and Testing the System
1. Reconnecting the Damaging Terminal
Connect the detrimental terminal of the battery to its submit and tighten the nut.
2. Tightening the Optimistic Terminal
Reattach the optimistic terminal, making certain it is safe and tightened.
3. Beginning the Car
Insert the important thing and begin the automobile.
4. Verifying Operate
Verify if the blower motor is now functioning as anticipated at numerous pace settings.
5. Checking for Leaks
Examine the changed blower motor resistor for any indicators of leaks or harm.
6. Monitoring Operation
Observe the blower motor operation for a couple of minutes to make sure constant and dependable efficiency.
7. Troubleshooting Potential Points
If any points persist, study the wiring connections, examine the blower motor, or seek the advice of a professional mechanic for additional analysis.
8. Reconnecting the Controls
Reinstall the controls and guarantee they’re securely hooked up and operational.
9. Testing System Operate
Confirm the blower motor and controls are working collectively seamlessly below numerous situations.
10. Put up-Restore Inspection
After an prolonged interval of operation, examine the blower motor resistor and surrounding elements for any indicators of harm or extreme warmth.
Find out how to Change a Blower Motor Resistor
A blower motor resistor is a small, electrical system that regulates the pace of a blower motor. It’s sometimes positioned close to the blower motor, and it’s linked to the motor’s energy provide. When the resistor is working correctly, it’s going to permit the motor to run at a constant pace. Nevertheless, if the resistor fails, it might trigger the motor to run too slowly or too rapidly, or it might even trigger the motor to cease working altogether.
In case you are experiencing any issues with the pace of your blower motor, you might want to exchange the blower motor resistor. It is a comparatively easy activity that may be accomplished in a couple of minutes. Listed below are the steps on the best way to do it:
- Flip off the facility to the blower motor.
- Find the blower motor resistor. It’s sometimes positioned close to the blower motor, and it is going to be linked to the motor’s energy provide.
- Disconnect the wires from the resistor.
- Take away the resistor from the mounting bracket.
- Set up the brand new resistor within the mounting bracket.
- Join the wires to the brand new resistor.
- Activate the facility to the blower motor.
- Take a look at the blower motor to ensure that it’s working on the right pace.
Individuals Additionally Ask
What are the signs of a nasty blower motor resistor?
The signs of a nasty blower motor resistor can embrace:
- The blower motor is working too slowly
- The blower motor is working too rapidly
- The blower motor just isn’t working in any respect
- The blower motor is making an odd noise
How do I check a blower motor resistor?
You possibly can check a blower motor resistor with a multimeter. Set the multimeter to the ohms setting, after which contact the probes to the terminals of the resistor. The resistor ought to have a studying of between 0 and 10 ohms. If the studying is considerably increased or decrease than this, then the resistor is probably going unhealthy.
How a lot does it value to exchange a blower motor resistor?
The associated fee to exchange a blower motor resistor will range relying on the make and mannequin of your automobile. Nevertheless, the typical value is between $50 and $100.
