Blower motor resistors are small however important parts 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 lowered airflow, overheating, and even electrical fires. Thankfully, changing a blower motor resistor is a comparatively easy and cheap process that may be accomplished in a number of hours.
Step one is to determine the situation of the blower motor resistor. It’s usually situated within the blower compartment, which is often discovered close to the furnace or air handler. After getting situated the blower motor resistor, you will have to disconnect the facility 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 duvet of the blower compartment and find the blower motor resistor. It’s usually hooked up to the blower motor with a number of screws.
After getting situated the blower motor resistor, you will have to disconnect the wires which can be related to it. Make sure you label the wires in an effort to reconnect them appropriately later. As soon as the wires are disconnected, you possibly can 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. Make sure you 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 make it possible for it’s working correctly.
Assessing the Blower Motor Resistor Injury
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 isn’t any 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. Discuss with the car’s service guide or on-line assets 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 | Potential Causes |
|---|---|
| No air circulate from any pace setting | Defective blower motor or resistor |
| Fluctuating air flowDefective resistor or intermittent connection | |
| Air circulate solely on excessive pace | Open circuit in resistor or wiring problem |
3. Visible Inspection:
Rigorously examine the resistor for any seen indicators of injury, resembling 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. Examine the measured worth with the specs offered within the car’s guide. A major deviation from the desired worth signifies a defective resistor.
Instruments Required for Alternative
Changing a blower motor resistor requires a number of primary instruments. This is what you will want:
Flashlight
A flashlight is crucial for illuminating the work space, particularly if you happen to’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 arms from sharp edges or electrical parts, it is really useful to put on gloves whereas dealing with the blower motor resistor.
Digital multimeter (optionally available)
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.
Extra Ideas for Utilizing a Multimeter
In case you’re utilizing a digital multimeter to check the blower motor resistor, listed below are a number of further 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 throughout the specified vary for the resistor, it is thought-about practical. |
Eradicating the Blower Motor Housing
To entry the blower motor resistor, that you must take away the blower motor housing. This generally is a difficult course of, so it is necessary to observe these steps fastidiously.
1. Disconnect the Unfavorable Battery Terminal
Security first! Earlier than you begin engaged on the blower motor, disconnect the detrimental battery terminal. This can stop any electrical accidents.
2. Find the Blower Motor Housing
The blower motor housing is often situated below the dashboard, on the passenger facet of the car. It is a rectangular field with a number of wires and hoses related 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’ll want to get all of them.
4. Disconnect the Wires and Hoses
As soon as the screws are eliminated, that you must disconnect the wires and hoses which can be related 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 possibly can 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 situated contained in the blower motor housing. It is a small, rectangular part with a number of wires related to it. To take away the blower motor resistor, that you must:
- 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 getting eliminated the blower motor resistor, you possibly can set up the brand new one instead. Make sure you 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 Unfavorable Terminal
Connect the detrimental terminal of the battery to its put up and tighten the nut.
2. Tightening the Optimistic Terminal
Reattach the constructive terminal, guaranteeing it is safe and tightened.
3. Beginning the Automobile
Insert the important thing and begin the car.
4. Verifying Perform
Verify if the blower motor is now functioning as anticipated at varied pace 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, look at the wiring connections, examine the blower motor, or seek the advice of a certified mechanic for additional analysis.
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 below varied circumstances.
10. Publish-Restore Inspection
After an prolonged interval of operation, examine the blower motor resistor and surrounding parts for any indicators of injury or extreme warmth.
Tips on how to Change a Blower Motor Resistor
A blower motor resistor is a small, electrical gadget that regulates the pace of a blower motor. It’s usually situated close to the blower motor, and it’s related to the motor’s energy provide. When the resistor is working correctly, it is going to enable the motor to run at a constant pace. Nonetheless, if the resistor fails, it may possibly trigger the motor to run too slowly or too rapidly, or it may possibly even trigger the motor to cease operating 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 process that may be accomplished in a couple of minutes. Listed below are the steps on find out how to do it:
- Flip off the facility to the blower motor.
- Find the blower motor resistor. It’s usually situated close to the blower motor, and it is going to be related 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 make it possible for it’s operating on the appropriate pace.
Folks Additionally Ask
What are the signs of a nasty blower motor resistor?
The signs of a nasty blower motor resistor can embody:
- The blower motor is operating too slowly
- The blower motor is operating too rapidly
- The blower motor isn’t operating in any respect
- The blower motor is making an odd noise
How do I check a blower motor resistor?
You may 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 greater or decrease than this, then the resistor is probably going unhealthy.
How a lot does it price to exchange a blower motor resistor?
The associated fee to exchange a blower motor resistor will differ relying on the make and mannequin of your car. Nonetheless, the common price is between $50 and $100.
