The resistor is visible above the blower motor in the repair manual. For access, it is instructed to remove the dash pad. You might be able to access it by taking out the glove box.
In This Article...
How is a blower motor resistor changed?
- First, if necessary, open the glove box door.
- Step 2: Remove screws and disconnect the electrical harness.
- Step 3: Discard the blower motor resistor and replace it.
- Reattach the wiring harness after tightening screws in step 4.
- Reinstall the glove box door in step five.
How much does it cost to replace the resistor in a blower motor?
What is the price of a blower motor resistor? You would spend between $50 and $150 to replace the blower motor resistor, including the cost of the necessary tools and labor. However, you can save up to $70 by doing it yourself at home.
How can I tell if the resistor on my blower motor is bad?
Blower motor resistors are generally dependable, although they might malfunction suddenly, just like any other electrical component. Fortunately, identifying a malfunctioning blower motor resistor is not too difficult.
Here are several warning indicators that the blower motor resistor in your car is damaged:
- HVAC fan control loss (total or certain speeds)
- Only the fan’s highest speed setting is active.
- Vents aren’t blowing air at all
- uneven or sporadic fan speed
As we mentioned in the last section, you’ll likely first notice the issue when you realize that the passenger compartment of your car isn’t cooling off or heating up as it usually would. This takes us to a crucial point. A defective blower motor resistor will have an impact on both the heating and cooling capacities of your HVAC system because it directly affects airflow.
Is it the blower motor or blower motor resistor?
The blower motor resistor is in charge of managing the speed of the blower motor. Previously, this was accomplished by changing the voltage delivered to the blower motor. The blower motor resistor is actually a solid state module in recent systems that provides the blower motor a variety of signals.
Should the blower motor and resistor be replaced simultaneously?
Hello. We do advise you to change the resistor concurrently. Although it might not be crucial, doing this will keep the system more consistent. Even the resistor can be involved in the problem. You do not need to replace it if you are aware that it has nothing to do with the problem. However, it would guarantee that the motor operates at its best. When a motor only operates when you tap it, there is usually a problem with the motor. These tiny motors have a tendency to jam, which can cause lags in operation. When you tap them, they release their binding and resume normal operation until they find themselves in the same location. Usually, it results from subpar manufacture. Not every component leaves the production line in perfect shape. If you’d like this examined, a qualified technician can visit your home or business to examine the blower motor and, if necessary, replace it.
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Where is the resistor for the heater’s blower located?
A blower motor is the name for the motor that drives the fan in an automobile’s heating and air conditioning system. It is situated inside the dash, frequently on the side opposite the steering wheel, or on the firewall inside the engine compartment.
The component that manages the blower motor’s speed is either a blower motor resistor or a blower motor control module.
What is the distinction? A straightforward electric resistor is a blower motor resistor. It is utilized in automobiles with blower motors that only have 4 or 5 fixed speeds, as seen on the diagram’s left side. View the blower motor resistor in the Ford.
An electronic blower motor control module, as seen in the photo, is present in automobiles with automatic temperature control and those whose blower speed can be gradually changed.
In the majority of contemporary cars, the blower motor resistor or control module is mounted close to the blower motor within one of the HVAC system’s ducts. This is done so that airflow can cool the resistor or control module. An access panel for the blower motor resistor was mounted on the firewall of some older vehicles.
How long does it take to change a car’s blower motor?
How long does it take to change a car’s blower motor? An skilled technician can replace a blower motor in around 4 hours on average. The task should take at least six hours if you do it alone in your garage with basic tools.
Where is the relay for the blower motor located?
The under-hood fuse box or the under-dash fuse box are often where you’ll find the blower motor relay. Relay failure may look like a blown fuse. Many of the same symptoms might also be caused by a broken blower motor switch.
Can you fix a blower motor?
The worst time for your heat to fail is undoubtedly during the winter. You’ll want to take care of this repair as soon as possible if you have the unfortunate experience of getting into your automobile and realizing it has.
Your heating system may have a variety of problems, but if the air completely stops blowing and the same holds true for cold air settings, a blower motor replacement is probably necessary. The good news is that the repair is extremely simple.
Could a faulty blower motor resistor result in no AC?
The lack of any airflow from the vents of the car is another sign of a broken blower motor resistor. The blower motor resistor is what supplies power to the blower motor, thus if it breaks down or develops any problems, power can be cut off to the motor. Without power, a blower motor will be unable to generate any air pressure, leaving the HVAC system without the ability to produce airflow through the vents.
Due to the fact that the blower motor resistor is the component directly in charge of powering the blower motor, when it malfunctions, both the blower motor and the heating and cooling system may encounter serious problems. Have a qualified mechanic, like one from YourMechanic, examine the vehicle to see whether the blower motor resistor needs to be replaced if your car is exhibiting any of the symptoms listed above or you suspect a problem.
Which relay is in charge of the blower motor?
1. Single-speed motors are switched on and off. Until the necessary temperature is reached, these motors run continuously at the same speed.
2. Variable fan speeds offered by multi-speed versions enable the elimination of cold patches and other temperature modifications. The ability to control tiny temperature changes makes variable speed motors more energy-efficient than multi-speed machines, which require less fuel to heat up bigger areas.
The relay in a blower motor provides the energy necessary for the fans to circulate heated air. The blower motor relay acts as an on/off switch, beginning and ending the heating cycle in HVAC systems by managing the current flow between the power source and the motor.
Blower motor relays frequently fail due to the strain of repeated back-and-forth switching.
- There may not be a mechanical issue with the blower motor itself if it is completely unresponsive. Since the relay generates the electricity that moves the motor, a worn-out relay could be the cause of an unresponsive motor.
- More than just managing electrical current is what the blower motor relay does. Relays are a crucial component of surge prevention. The relay will discharge extra current into the fuse when it encounters a surge of intense current or is unable to disperse and control its load. As a result, the system must shut down in order to prevent electrical harm. So, blown fuses might be an indication of relay problems.
- Relays for blower motors may manage a lot of current. Relays that aren’t working properly can’t spread their load evenly. As a result, the relay may hold too much heat and grow uncomfortable to the touch. The heat from a damaged relay can melt away the plastic casing and surrounding components if the problem is not fixed. In severe circumstances, the panel or fuse box may also be harmed.
The HVAC system cannot distribute the treated air until the defective relay is fixed.
How can I determine whether I need a new blower?
Call a heating contractor as soon as you can if you notice any weird noises coming from your furnace, such as squealing, screeching, rattling, or clanking. Some problems might be simple to fix, but others would call for replacing the blower motor.
Squealing or screeching noises may be a sign of a belt failure in an older belt drive furnace or bearing troubles in direct drive furnaces. Now, if a part of your heating system is breaking or being damaged, it will likely make rattling or knocking noises. Banging noises are more concerning and occasionally indicate that the blower motor has to be replaced. To identify the potential source of the issue, a skilled HVAC expert must perform a complete check.
What could stop a blower motor from operating?
Blower motor failure can be caused by a variety of factors, including wear and tear on the motor’s bearings, high amp draw, electrical failure in the windings, filth buildup, and more.
According to Tom Beaulieu, president of Bay Area Services Inc. in Green Bay, Wisconsin, “the most prevalent cause is dirt collection due to lack of maintenance.” “There may be a belt-drive blower in extremely ancient residential systems or, more frequently, in commercial systems. In some circumstances, too much belt tension may be the culprit. Tight belts put excessive strain on the bearings, which accelerates wear. Otherwise, typical aging problems like bearing failure result in seizing, which causes severe electrical failure. A less frequent problem is inadequate electricity going to the blower.”
Checking to see if there is a demand for the blower is the first step in diagnosing blower motor failure. According to John Boylan, general manager of Lakeside Service Co. in Brighton, Michigan, if there is and the blower isn’t working, it’s probably either a mechanical or an electrical issue.
Then, he explained, “we check for electrical failure by first ensuring that the circuit board is supplying the proper voltage to the blower. We check for mechanical failure by checking the bearings to see if they are in good condition and if the wheel spins freely.” “If that is okay, we then examine the capacitor’s microfarads to see if it has a short or an open. If the capacitor is functioning properly and the motor doesn’t have any mechanical issues when voltage is introduced to it, the issue is electrical.”
According to Beaulieu, “it’s terrible if there is electricity getting to it, the capacitor checks out, and the motor still won’t operate.” “The motor may also be operating, but it may be very noisy and consume a lot of current. That indicates that the bearings are worn and producing too much drag.”
The module on ECMs is frequently the problem, according to Ed Kittle, operations manager at Howald Heating and Air Conditioning in Indianapolis, and changing it would typically fix the issue.
Once the housing is removed, it takes around four screws, according to Kittle. “After that, you re-plug it. A few tools are available [for evaluating motors], such as the TECMate [from Genteq]. It tells you whether the motor is okay or defective after you plug it in and press a button.”
Even though recurring blower motor failure is rare, it can happen. In order to stop the motor from failing again, the cause must be identified.
If it’s dirt, Beaulieu remarked, “it’ll be extremely obvious.” “A meter reading under load will reveal the situation if it is power-related. Verify that the belt size is correct and that the pulleys are the appropriate match.”