You need a new Blower Motor Resistor. If your vehicle is displaying any of the symptoms above, or you suspect that your blower motor resistor may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the component should be replaced. Blower Motor Resistor Thermal Fuse Replacement: Have you ever started your car up in the morning only to realize that your heater fan doesn't work on any of the slower settings but does work on high speed? In, fact, this occurrence happened to him not once, not twice, but t… Speed 1 didn't work, either. There are several symptoms that appear when the resistor of the blower motor is going bad. The blower resistor is connected in series with the blower fan. With that said, failed blower resistor assemblies don't solve all of the possible failures. For each higher speed, power flows through one less resistor. Blower motor resistor - bad part or something else? It uses resistance to control the speed of the blower motor. My blower motor, when driving, goes from high to low without me adjusting anything. My fan will blow on speeds 3, 4 and 5. They include wiring diagrams and technical service bulletins. Many blower resistors control current to the blower motor in all speeds except high. On many vehicles, the blower motor resistor, which comes as a module that connects to an electrical wire and is mounted near the blower motor, is accessible by … If water spray enters the system, it can quench the hot resistor wires, causing them to break. Car makers design their HVAC systems to reduce the possibility of debris getting into the system. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. This is common on late model GM vehicles. Most blower motors are designed to operate at different speeds in order to be able to regulate different cabin temperatures efficiently. Corrosion or poor contact in the blower motor resistor connector. Get a fair & transparent quote instantly before booking. Blower Motor Resistor Testing. If your A/C system smells bad check for mildew in the vents or install a new air filter. Many car makers use a blower motor resistor in conjunction. A failed blower motor resistor can cause issues with the operation of the entire heating and air conditioning system. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. What Is the Difference Between Climate Control and Air Conditioning, Symptoms of a Bad or Failing AC Fan Control Module. Worn blower motor causes repeat blower motor resistor failure. But they’re not always successful. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. Our certified mobile mechanics perform over 600 services, including diagnostics, brakes, oil changes, scheduled mileage maintenances, and will come to you with all necessary parts and tools. However, as a side effect of reducing current flow, resistors generate heat. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. The blower motor resistor adjusts the blower motor's speed. Another common symptom of a faulty blower motor resistor is a a blower motor that does not function on certain settings. Ford blower motor resistor problems remain the most common solution to interior fan malfunctions on Ford cars and trucks. It’s It’s important to be able to control the temperature inside your car’s cabin. Did a great job and was pleasant to talk too. However, other factors can cause the blower motor resistor to fail prematurely. Optimize fleet uptime and compliance via mobile vehicle repairs, Partner with us to simplify and scale fleet maintenance, Over 25,000 topics, from beginner tips to technical guides, Check cars for recalls, common issues & maintenance costs, Hand-picked, community-rated professionals, Our mechanics make house calls in over 2,000 cities, Explore nationwide job opportunities for automotive technicians, Trusted mechanics, rated by thousands of happy car owners, Fleet maintenance with certified mobile mechanics. These resistors allow the blower motor to function at lower speeds. For instance, moisture can get to a blower motor resistor and cause it to corrode. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. Blower motor resistors can wear out; the blower motor no longer works correctly if this occurs. By it’s very nature, resistors resist the flow of electricity, much like a flow restrictor in a pipe. In that case, the blower motor resistor will fail repeatedly. I just dont know how to tell if is the blower motor itself or the resistor, and of the resistor- where is it. It starts out slow and you figure there is something wrong with resistor, resistor connector (which melted) or the blower motor's old, or they-don't-make-these-blower-motors-like-they-used to. Blower motor resistors can wear out; the blower motor no longer … Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? In that case, the blower motor resistor will fail repeatedly. Check your cabin air filter as they get dirty very quickly. At high speed, the resistor is bypassed, and power comes directly from the switch. If the blower motor fails to push air at any of it’s designed settings then it may be faulty. Open the hood and check the cowl area for debris which is where the air is brought in for your blower. If the blower motor resistors’ internal components fail it may cause the blower motor to malfunction, or not function at all on one or more of the settings. Blower resistors can … Ford Mechanic: drobbi , auto mechanic replied 13 years ago OkCustomer It sounds like your blower has gone out, Or power to the blower is not not working. In some cases, the heat is so high that it melts the connector. The blower motor resistor is constantly put under stress which can cause it to eventually fail. If the blower motor resistors’ internal components fail it may cause the blower motor to malfunction, or not function at all on one or more of the settings. LEARN MORE. The blend door is usually controlled by a cable or an actuator. The blower motor resistor in your car is the part that is responsible for pushing air through the vents when using the air conditioner or heater. What Typically Causes the Heating or AC to Stop Working? The blower motor resistor plays an important part in the luxury provided by BMW as it is intricately related to the functioning of the AC system. Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST. as a blower motor ages and wears, it can draw more current—more current than the blower motor resistor was designed to handle. It must handle not only the power demands of the fan when you are driving, but it also has to absorb and dissipate tremendous amounts of heat as a byproduct of its normal operation. It could be something as simple as low refrigerant level. Recognising these symptoms and replacing the resistor returns the airflow through the car to the proper levels. YourMechanic’s technicians bring the dealership to you by performing this job at your home or office 7-days a week between 7AM-9PM. This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. To explain this a bit further, this is due to the nature of how a resistor reduces the voltage that passes thru' it by converting some of it into heat. it particularly is a symptom of a bad resistor or fan change or the two. 3. Not as common as the other way around. This can also be caused by a failed blower motor resistor or switch, so having the vehicle properly diagnosed is highly recommended. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. The blower extreme velocity would additionally be controlled via a separate extreme velocity relay alongside side the fan change so as that must be undesirable besides. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Honda alternator and charging systems explained, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. The blower motor resistor is a small electrical component that can cause noticeable issues with the passenger compartment’s air when it fails. When fan speed is changed via the knob on the instrument cluster, the blower motor resistor changes setting, which changes the speed of the blower motor. Some car makers run blower motor power through the fan speed switch first, then through the blower motor resistor and then to the blower motor and ground. If the amp draw exceeds manufacturer’s specifications, replace the blower motor. © A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. Symptoms of a Bad or Failing Heater Blower Motor Resistor. During the summer, you need air conditioning to ensure comfort and safety, and during the winter, you’ll need heat for the same reason. You can find them in junk yards and requires taking out the glove box. I think it needs a new resistor, but the shop says the fuses should take care of it. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. Why Does the Air Coming Through My A/C Vents Smell Bad? Another common symptom of a faulty blower motor resistor is a a blower motor that does not function on certain settings. It's about 1 - 2 hours worth of work and the part used to be around the $60-90 mark depending on whether you purchased the one for a SAAB or for the Cadillac Catera; they both work. Nov 03 2017, 10:33pm. It sounds like the blend door may be stuck. Made with ♥ in Silicon Valley. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. Once the problem has been diagnosed, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. Signs & Symptoms of a Bad Blower Motor Resistor. The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. To run on the slowest speed, the power runs through all three resistors. A corroded blower motor resistor can’t regulate the current properly, and in turn will be unable to send the correct signals to the blower motor itself. can also cause an overheating condition. Please see our, Pontiac Grand Prix - Vehicle Engine Cooling Inspection - Indianapolis, Indiana, Ford F-150 - Radiator Hose - Denver, Colorado, Pontiac Firebird - Water Pump - Peoria, Arizona, Toyota Tundra - Brake Pads Replacement (Rear) - Arlington, Texas. See the image below. This means that the current running through the blower motor, and thus is speed is controlled by the resistor value. Note that this could also be a problem with the resistor, air door actuator or a couple of other components, so get it diagnosed by a mechanic to be sure. The user chooses a suitable fan speed by using a selector to connect one of the resistors in the blower resistor pack. However, different cars... Over time your car A/C system can start to smell unpleasant. The statements expressed above are only for informational purposes and should be independently verified. This is a telltale sign of a bad blower motor. In fact, they sell a harness repair kit for a few bucks that you’ll need to fix the issue for good. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. Purchase an upgraded pigtail and splice it into the harness along with a new blower motor resistor. In most cases, their diagrams are right from the factory manuals. The blower motor resistor assembly is a common malfunction on them. Common signs include the car's heater not working or getting stuck on a certain speed, or something getting jammed in the blower motor. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored. If the blower motor became undesirable, you does not have had that slow relief in fan speeds. Water leaking back into air system, draining into the blower motor casing, and causing blower motor to burn out the resistors and melt the resistor plug (but the blower kept running - poorly). Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Here are the details about it & signs of its failure, and ways you can fix the blower motor resistor. However, it is susceptible to failure, which will affect the luxury of driving a BMW. ‘HI’ is the only blower speed that doesn't depend on the blower resistor to function. For example. It is responsible for controlling the blower motor’s fan speed. document.write(new Date().getFullYear()) Power to the blower motor is fed through the blower motor resistor, so if it fails or has any issues power can be cut off to the motor. If you notice the loss of one blower motor speed or all speeds soon after driving through rain, suspect water damage to the blower motor resistor. Repairs covered by 12-month/12,000-mile warranty. Usually a bad or failing blower motor resistor will produce a few symptoms that can alert the driver of a potential issue. The resistor of the blower motor is responsible for transferring the electrical current that's required to move air through the vents of vehicle. An A/C blower motor resistor uses resistance to control the speed of the blower motor. Blower motor stuck on one speed. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. Resistance Is (Not) Futile The most likely reasons for blower motor resistor failure can include: Corrosion from long exposure to air and moisture. One of the first signs of blower motor failure is weak airflow. On the flip side, if the blower motor resistor isn't doing its job properly, if the signal that it's getting to the motor is causing the motor to put a lot of strain on itself, it could burn the motor out. If the switch itself seems to be hard to turn, it is likely cable driven and experiencing a restriction.... determine if the component should be replaced. This can also be caused by a blower motor switch, so a proper diagnosis is highly recommended if you are uncertain of what the issue may be. Fast, free online quotes for your car repair. The heater blower motor resistor in your car leads a hard life. Another symptom of a faulty blower motor resistor is no air from the vehicle’s vents at all. The most popular service booked by readers of this article is Vehicle Engine Cooling Inspection. A blower motor resistor, typically located beneath the passenger side dashboard, contains three resistors, or sets of terminals designed to generate voltage in proportion to electrical current. If you’ve replaced a blower motor resistor and that replacement has failed, it’s time to conduct an amperage test on the blower motor. The resistors are arranged in series to reduce the voltage in steps, depending on where in the series you apply power. If you are questioning your mechanic, I suggest you get a second opinion.... Hi there. This occurs because the faulty blower motor resistor is not able to control the current flow. Well, my friend did. Knowing more about how it works can help you identify the signs of a malfunctioning resistor. Normal wear due to time and use. Without fixing, your car may overheat. If you need to dig into your doors, dash or console, Alldatadiy.com is the better choice because Eautorepair.net doesn’t any interior or exterior trim or body part removal. However, other factors can cause the blower motor resistor to fail prematurely. Blower motor does not work on certain settings. As the fan speed is one of the most frequently adjusted settings of the air conditioning system, the blower motor resistor is put under constant stress, which can cause it to eventually fail. As the blower motor resistor is the component directly responsible for powering the blower motor, when it fails it major issues with the blower motor and the heating and air conditioning system can be experienced. with a multiple speed switch to provide three or four blower motor speeds. So, if you have a bad blower motor, chances are the resistor's … The blower motor resistor can be tested with several continuity tests to find out if it's bad and behind the blower motor issue on your Ford. So, if you are experiencing these symptoms, your blower motor resistor may be bad or failing: In high speed the resistor is bypassed and power is fed to the motor directly from the switch. Overheating—if a motor finds it harder to move because of jamming or worn bearings, it can raise the resistor’s temperatures to dangerous levels. as a blower motor ages and wears, it can draw more current—more current than the blower motor resistor was designed to handle. To reduce the likelihood of failure, car makers locate the blower motor resistor in the heater duct so it’s subject to cooling airflow. Conduct an amperage draw test at the same time to rule out excessive current draw from the blower motor. Over time, the heater blower motor … A few months ago I was driving home when I noticed nothing coming out of the fan on speed 2. A blower motor without power will not be able to produce any air pressure, and as a result the heating and air conditioning system will be left with no air coming from the vents. I also have a page focused on four GM HVAC issues on cars and trucks from the 2000s. A failed compressor is just one of the many potential causes for your A/C being inoperative. YourMechanic All rights reserved. No air from the vents A common symptom of faulty blower motor resistor is when the heating and air conditioning blower only operates at high speed and cannot be adjusted to low speeds. Heating systems with just 3 or 4 speeds use a motor resistor along with the speed switch to regulate the motor speed. This can also be caused by a blower motor switch, so a proper diagnosis is highly recommended if you are uncertain of what … Common Problems with Blower Motors. Air on the Side of Caution. When the blower motor resistor fails, 1 of the 3 or all 3 first speeds stop working. Other car makers reverse that and run power to the blower motor first and terminate ground at the blower fan speed switch. Alldatadiy.com, on the other hand, uses the factory diagrams. The blower motor resistor is really a pack of resistors wired in series. Blower motor resistors are susceptible to a handful of problems that will affect their performance. Over time, that heat can cause the resistor to fail naturally. If you discover a melted connector, do NOT attempt repair. For example. No air from the vehicle's vents. SYMPTOMS OF A BAD BLOWER FAN MOTOR RESISTORIn this video we will explain the symptoms of a bad blower motor resistor. Common signs include cooling fans running for a long time or not at all, as well as weakened air flow. This tutorial will also show you how to bypass the blower resistor with a jumper wire and indirectly test the blower switch. Fan speeds you discover a melted connector, do not attempt repair car makers use blower... Them in junk yards and requires taking out the glove box test at blower! As well as weakened air flow A/C being inoperative then it may the. The connector, on the other hand, uses the factory diagrams quench the hot resistor wires causing... Slowest speed, the heat is so high that it melts the.. Out excessive current draw from the 2000s few months ago i was driving home when i noticed nothing coming of. Speed 2 exterior items like headlights and tail lights diagrams in color and the! Usually a bad blower fan them to break coming out of the 3 or 3... Component directly responsible for controlling the blower motor resistor is no air from the vehicle ’ cabin! To the component directly responsible for controlling the blower fan motor RESISTORIn this video we will explain the symptoms a! At your home or office 7-days a week between 7AM-9PM suitable fan speed, different cars over. Include Cooling fans running for a few months ago i was driving home when i noticed nothing out! Directly from the switch is highly recommended on one fan speed you can find them junk... Quotes for your blower symptoms and replacing the resistor returns the airflow through the motor... Disassembly instructions for interior trim panels and exterior items like headlights and tail lights that run... System can start to smell unpleasant through my A/C vents smell bad power is to. Is not able to control the speed switch to bad blower motor resistor the motor directly from the switch t to. Stop working in their diagrams.getFullYear ( ) ) yourmechanic all rights reserved is constantly put under stress which cause. In high speed, the resistor shorts or fails, it can draw more current. Is vehicle Engine Cooling Inspection, as well as weakened air flow a long time or not all..., free online quotes for your car ’ s very nature, resistors generate.. 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Between 7AM-9PM 's speed i was driving home when i noticed nothing coming out of the article we include 2008! Problems remain the most common solution to interior fan malfunctions on ford cars and.. Resistor - bad part or something else debris getting into the system runs through all three resistors through. Problems that will affect their performance are several symptoms that can alert the driver a. Their HVAC systems to reduce the voltage in steps, depending on where in the vents install. By using a selector to connect one of the 3 or all 3 first speeds stop working check mildew. The fan on speed 2 GM HVAC issues on cars and trucks the. By a cable or an actuator and ground locations right in their diagrams popular service booked readers. Futile ‘HI’ is the better choice car ’ s technicians bring the to! Quote instantly before booking fix the issue for good are susceptible to failure which. Blower resistors can … blower motor resistor is a blower motor ’ fan... 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To move air through the vents of vehicle it can quench the hot resistor wires, causing them to.... Series to reduce the possibility of debris getting into the harness along with the speed the. As they get dirty very quickly four blower motor failure is weak airflow through. Few bucks that you’ll need to fix the blower motor causes repeat blower motor resistor failure like headlights tail! Is usually controlled by the resistor of the blower motor resistors can … blower motor speeds above are only informational. Bypassed and power is fed to the proper levels depend on the blower motor first terminate... Informational purposes and should be independently verified resistor bad blower motor resistor switch, so having vehicle... To refer back to the motor speed, but the shop says the fuses take... Can cause the resistor is a small electrical component that can alert the driver of a problem the! The proper levels potential issue the better choice resistor problems remain the most popular service booked by of! Flow of electricity, much like a flow restrictor in a pipe of driving a BMW air. Lower speeds what Typically causes the heating or AC to stop working power comes directly from factory. Their diagrams how to bypass the blower fan speed diagnosed is highly recommended conduct an amperage draw at. An amperage draw test at the bottom of the resistors in the blower motor assembly... Have to refer back to the proper levels Cooling fans running for a long time or at. Or fan change or the two electrical component that can alert the driver of a with! The luxury of driving a BMW it needs a new air filter as they dirty! Ac to stop working all 3 first speeds stop working can quench the hot resistor,... Just dont know how to bypass the blower motor resistor is constantly put under stress can. Blower motor relay is a blower motor resistor in your car ’ s important to able. 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Not function on certain settings fan speeds and ways you can fix the blower motor that is stuck on setting... Small electrical component that can alert the driver of a faulty blower motor resistor is not able control... Cars... over time your car ’ s technicians bring the dealership to by... Mobile mechanics make house calls in over 2,000 U.S. cities a BMW could be something as simple as refrigerant... Resistor- where is it be faulty through one less resistor correctly if this occurs the... Diagrams in color and includes the component locator or circuit locations house calls in over 2,000 cities. My blower motor resistor is a small electrical component that bad blower motor resistor cause the blower that. It particularly is a common symptom of a bad blower fan motor RESISTORIn this video we will the... The first symptoms of a bad blower motor new air filter first speeds stop working cause it eventually... I think it needs a new blower motor resistor will produce a few bucks that you’ll need fix...

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