Blower motor resistors are small however important parts in your HVAC system. They regulate the velocity of the blower motor, which in flip impacts the airflow all through your house. Over time, blower motor resistors can fail, resulting in a variety of issues, together with decreased airflow, overheating, and even electrical fires. Fortuitously, 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 usually positioned within the blower compartment, which is often discovered close to the furnace or air handler. After you have positioned the blower motor resistor, you have to to disconnect the ability to the HVAC system. This may be completed 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 usually hooked up to the blower motor with a couple of screws.
After you have 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 that you could 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 removing 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 ability to the HVAC system and check the blower motor to be sure that it’s working correctly.
Assessing the Blower Motor Resistor Injury
Diagnosing a defective blower motor resistor requires a scientific strategy. Listed here 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. Test 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, usually 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 often has a number of terminals and a definite form, making it simple to determine.
| Fault Description | Doable Causes |
|---|---|
| No air circulation from any velocity setting | Defective blower motor or resistor |
| Fluctuating air flowDefective resistor or intermittent connection | |
| Air circulation solely on excessive velocity | Open circuit in resistor or wiring situation |
3. Visible Inspection:
Fastidiously examine the resistor for any seen indicators of harm, similar to burn marks, cracks, or free connections. A burnt resistor usually signifies a brief circuit, whereas free connections could cause intermittent airflow points.
4. Electrical Testing:
Use a multimeter to measure the resistance throughout the resistor terminals. Evaluate 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 primary instruments. This is what you will want:
Flashlight
A flashlight is crucial for illuminating the work space, particularly should you’re working in a dimly lit space or underneath 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 fingers from sharp edges or electrical parts, it is really helpful to put on gloves whereas dealing with the blower motor resistor.
Digital multimeter (non-obligatory)
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 parts.
Further Ideas for Utilizing a Multimeter
For those who’re utilizing a digital multimeter to check the blower motor resistor, listed here are a couple of further suggestions:
| – 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-about practical. |
Eradicating the Blower Motor Housing
To entry the blower motor resistor, you could take away the blower motor housing. This is usually a difficult course of, so it is necessary to observe these steps rigorously.
1. Disconnect the Adverse Battery Terminal
Security first! Earlier than you begin engaged on the blower motor, disconnect the unfavorable battery terminal. This may stop any electrical accidents.
2. Find the Blower Motor Housing
The blower motor housing is often positioned underneath 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, you could disconnect the wires and hoses which can be linked to the blower motor housing. Watch out to not injury 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 injury any of the parts.
6. Find the Blower Motor Resistor
The blower motor resistor is often 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, you could:
- 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.
After you have eliminated the blower motor resistor, you may set up the brand new one as a replacement. You should definitely join the wires and hoses correctly, after which reinstall the blower motor housing.
| Step | Description |
|---|---|
| 1 | Disconnect the unfavorable 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 Adverse Terminal
Connect the unfavorable terminal of the battery to its put up and tighten the nut.
2. Tightening the Constructive Terminal
Reattach the optimistic terminal, guaranteeing it is safe and tightened.
3. Beginning the Car
Insert the important thing and begin the automobile.
4. Verifying Perform
Test if the blower motor is now functioning as anticipated at varied velocity settings.
5. Checking for Leaks
Examine the changed blower motor resistor for any indicators of leaks or injury.
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 certified mechanic for additional prognosis.
8. Reconnecting the Controls
Reinstall the controls and guarantee they’re securely hooked up and operational.
9. Testing System Perform
Confirm the blower motor and controls are working collectively seamlessly underneath varied situations.
10. Submit-Restore Inspection
After an prolonged interval of operation, examine the blower motor resistor and surrounding parts 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 machine that regulates the velocity of a blower motor. It’s usually positioned close to the blower motor, and it’s linked to the motor’s energy provide. When the resistor is working correctly, it can permit the motor to run at a constant velocity. Nonetheless, if the resistor fails, it will possibly trigger the motor to run too slowly or too rapidly, or it will possibly even trigger the motor to cease operating altogether.
In case you are experiencing any issues with the velocity of your blower motor, you might want to interchange the blower motor resistor. This can be a comparatively easy activity that may be accomplished in a couple of minutes. Listed here are the steps on how you can do it:
- Flip off the ability to the blower motor.
- Find the blower motor resistor. It’s usually positioned close to the blower motor, and will probably 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 ability to the blower motor.
- Take a look at the blower motor to be sure that it’s operating on the right velocity.
Folks Additionally Ask
What are the signs of a foul blower motor resistor?
The signs of a foul blower motor resistor can embody:
- The blower motor is operating too slowly
- The blower motor is operating too rapidly
- The blower motor shouldn’t be operating in any respect
- The blower motor is making an odd noise
How do I check a blower motor resistor?
You’ll be able to 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 larger or decrease than this, then the resistor is probably going dangerous.
How a lot does it value to interchange a blower motor resistor?
The associated fee to interchange a blower motor resistor will fluctuate relying on the make and mannequin of your automobile. Nonetheless, the typical value is between $50 and $100.
