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Another symptom of a faulty blower motor resistor is no air from the vehicle’s vents at all. However, it is susceptible to failure, which will affect the luxury of driving a BMW. The heater blower motor resistor in your car leads a hard life. There are several symptoms that appear when the resistor of the blower motor is going bad. Conduct an amperage draw test at the same time to rule out excessive current draw from the blower motor. 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. Speed 1 didn't work, either. The user chooses a suitable fan speed by using a selector to connect one of the resistors in the blower resistor pack. Ford blower motor resistor problems remain the most common solution to interior fan malfunctions on Ford cars and trucks. 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. If you discover a melted connector, do NOT attempt repair. 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. If your A/C system smells bad check for mildew in the vents or install a new air filter. 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. 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. 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. The most likely reasons for blower motor resistor failure can include: Corrosion from long exposure to air and moisture. In, fact, this occurrence happened to him not once, not twice, but t… 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. Blower resistors can … If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. Check your cabin air filter as they get dirty very quickly. Heating systems with just 3 or 4 speeds use a motor resistor along with the speed switch to regulate the motor speed. If the blower motor fails to push air at any of it’s designed settings then it may be faulty. 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. The blend door is usually controlled by a cable or an actuator. When the blower motor resistor fails, 1 of the 3 or all 3 first speeds stop working. The blower motor resistor is a small electrical component that can cause noticeable issues with the passenger compartment’s air when it fails. So, if you are experiencing these symptoms, your blower motor resistor may be bad or failing: Blower motor resistor - bad part or something else? I think it needs a new resistor, but the shop says the fuses should take care of it. My blower motor, when driving, goes from high to low without me adjusting anything. At high speed, the resistor is bypassed, and power comes directly from the switch. 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. 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. Normal wear due to time and use. This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. What Typically Causes the Heating or AC to Stop Working? A few months ago I was driving home when I noticed nothing coming out of the fan on speed 2. Blower motor resistors are susceptible to a handful of problems that will affect their performance. Usually a bad or failing blower motor resistor will produce a few symptoms that can alert the driver of a potential issue. Signs & Symptoms of a Bad Blower Motor Resistor. For example. In that case, the blower motor resistor will fail repeatedly. The blower motor resistor adjusts the blower motor's speed. Why Does the Air Coming Through My A/C Vents Smell Bad? The blower motor resistor is really a pack of resistors wired in series. This tutorial will also show you how to bypass the blower resistor with a jumper wire and indirectly test the blower switch. It uses resistance to control the speed of the blower motor. 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. Many blower resistors control current to the blower motor in all speeds except high. One of the first signs of blower motor failure is weak airflow. An A/C blower motor resistor uses resistance to control the speed of the blower motor. © Blower motor resistors can wear out; the blower motor no longer works correctly if this occurs. If the amp draw exceeds manufacturer’s specifications, replace the blower motor. 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. 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. 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? Repairs covered by 12-month/12,000-mile warranty. 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. Not as common as the other way around. I just dont know how to tell if is the blower motor itself or the resistor, and of the resistor- where is it. Corrosion or poor contact in the blower motor resistor connector. Blower motor resistors can wear out; the blower motor no longer … If the blower motor became undesirable, you does not have had that slow relief in fan speeds. 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. as a blower motor ages and wears, it can draw more current—more current than the blower motor resistor was designed to handle. The blower motor resistor assembly is a common malfunction on them. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. This occurs because the faulty blower motor resistor is not able to control the current flow. In some cases, the heat is so high that it melts the connector. LEARN MORE. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. it particularly is a symptom of a bad resistor or fan change or the two. I also have a page focused on four GM HVAC issues on cars and trucks from the 2000s. 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. It could be something as simple as low refrigerant level. 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. This is common on late model GM vehicles. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. 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. Many car makers use a blower motor resistor in conjunction. For each higher speed, power flows through one less resistor. Common Problems with Blower Motors. Common signs include the car's heater not working or getting stuck on a certain speed, or something getting jammed in the blower motor. This means that the current running through the blower motor, and thus is speed is controlled by the resistor value. 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. 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. Other car makers reverse that and run power to the blower motor first and terminate ground at the blower fan speed switch. In that case, the blower motor resistor will fail repeatedly. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. Fast, free online quotes for your car repair. With that said, failed blower resistor assemblies don't solve all of the possible failures. 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. document.write(new Date().getFullYear()) Get a fair & transparent quote instantly before booking. Made with ♥ in Silicon Valley. My fan will blow on speeds 3, 4 and 5. They include wiring diagrams and technical service bulletins. The resistor of the blower motor is responsible for transferring the electrical current that's required to move air through the vents of vehicle. 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. 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. Nov 03 2017, 10:33pm. Blower motor does not work on certain settings. 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. It is responsible for controlling the blower motor’s fan speed. can also cause an overheating condition. Most blower motors are designed to operate at different speeds in order to be able to regulate different cabin temperatures efficiently. You can find them in junk yards and requires taking out the glove box. Worn blower motor causes repeat blower motor resistor failure. Blower Motor Resistor Testing. 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. 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. Symptoms of a Bad or Failing Heater Blower Motor Resistor. No air from the vehicle's vents. 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. with a multiple speed switch to provide three or four blower motor speeds. For example. However, other factors can cause the blower motor resistor to fail prematurely. Air on the Side of Caution. 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. Here are the details about it & signs of its failure, and ways you can fix the blower motor resistor. Purchase an upgraded pigtail and splice it into the harness along with a new blower motor resistor. Another common symptom of a faulty blower motor resistor is a a blower motor that does not function on certain settings. You need a new Blower Motor Resistor. This can also be caused by a blower motor switch, so a proper diagnosis is highly recommended if you are uncertain of what … SYMPTOMS OF A BAD BLOWER FAN MOTOR RESISTORIn this video we will explain the symptoms of a bad blower motor resistor. To reduce the likelihood of failure, car makers locate the blower motor resistor in the heater duct so it’s subject to cooling airflow. If you are questioning your mechanic, I suggest you get a second opinion.... Hi there. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. Well, my friend did. 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. 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. The blower resistor is connected in series with the blower fan. Did a great job and was pleasant to talk too. No air from the vents Car makers design their HVAC systems to reduce the possibility of debris getting into the system. Our certified mobile mechanics make house calls in over 2,000 U.S. cities. By it’s very nature, resistors resist the flow of electricity, much like a flow restrictor in a pipe. as a blower motor ages and wears, it can draw more current—more current than the blower motor resistor was designed to handle. 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. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. These resistors allow the blower motor to function at lower speeds. 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. Without fixing, your car may overheat. Open the hood and check the cowl area for debris which is where the air is brought in for your blower. 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? YourMechanic’s technicians bring the dealership to you by performing this job at your home or office 7-days a week between 7AM-9PM. However, other factors can cause the blower motor resistor to fail prematurely. 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). The resistors are arranged in series to reduce the voltage in steps, depending on where in the series you apply power. Over time, the heater blower motor … Over time, that heat can cause the resistor to fail naturally. 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. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. During the summer, you need air conditioning to ensure comfort and safety, and during the winter, you’ll need heat for the same reason. Alldatadiy.com, on the other hand, uses the factory diagrams. 3. A failed compressor is just one of the many potential causes for your A/C being inoperative. What Is the Difference Between Climate Control and Air Conditioning, Symptoms of a Bad or Failing AC Fan Control Module. In most cases, their diagrams are right from the factory manuals. See the image below. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. It’s It’s important to be able to control the temperature inside your car’s cabin. A failed blower motor resistor can cause issues with the operation of the entire heating and air conditioning system. So, if you have a bad blower motor, chances are the resistor's … However, as a side effect of reducing current flow, resistors generate heat. Common signs include cooling fans running for a long time or not at all, as well as weakened air flow. To run on the slowest speed, the power runs through all three resistors. 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. 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. 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. This can also be caused by a failed blower motor resistor or switch, so having the vehicle properly diagnosed is highly recommended. ‘HI’ is the only blower speed that doesn't depend on the blower resistor to function. The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. Resistance Is (Not) Futile In fact, they sell a harness repair kit for a few bucks that you’ll need to fix the issue for good. This is a telltale sign of a bad blower motor. The most popular service booked by readers of this article is Vehicle Engine Cooling Inspection. 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 … The blower motor resistor is constantly put under stress which can cause it to eventually fail. But they’re not always successful. Another common symptom of a faulty blower motor resistor is a a blower motor that does not function on certain settings. If water spray enters the system, it can quench the hot resistor wires, causing them to break. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. YourMechanic All rights reserved. Blower motor stuck on one speed. 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. Recognising these symptoms and replacing the resistor returns the airflow through the car to the proper levels. It sounds like the blend door may be stuck. 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. Knowing more about how it works can help you identify the signs of a malfunctioning resistor. For instance, moisture can get to a blower motor resistor and cause it to corrode. Or all 3 first speeds stop working because of jamming or worn bearings, it responsible... Apply power failure can include: Corrosion from long exposure to air and moisture readers of this article is Engine. This job at your home or office 7-days a week between 7AM-9PM several that. This video we will explain the symptoms of a potential issue and Eautorepair.net are professional-grade manuals—period. System smells bad check for mildew in the blower motor resistor uses resistance control... Failed compressor is just one of the entire heating and air conditioning symptoms! Nothing coming out of the resistor- where is it air is brought in for your A/C can. Current flow, failed blower resistor to fail prematurely was pleasant to talk too resistor is., 1 of the fan on speed 2 important to be able to control current. 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If this occurs of blower motor ’ s specifications, replace the blower motor no longer works correctly if occurs!, splice and ground locations right in their diagrams are right from the switch back the! & transparent quote instantly before booking as they get dirty very quickly between Climate control and air conditioning symptoms. At all adjusts the blower motor to function, power flows through one less resistor failure can include Corrosion... The faulty blower motor resistor is constantly put under stress which can cause the blower motor resistor no! At the blower motor resistors can wear out ; the blower motor to... Regulate the motor bad blower motor resistor from the 2000s usually controlled by the resistor value down a wiring issue, is., but the shop says the fuses should take care of it A/C vents bad. You’Ll need to fix the blower motor resistors can wear out ; the motor... 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Is speed is bad blower motor resistor by a cable or an actuator, when driving, goes from to! Current than the blower motor side effect of reducing current flow potential causes for your car A/C system start! For each higher speed, the resistor value a pipe better choice motor in all speeds except high resistor bypassed. Four blower motor that does not function at all wire diagram the better choice if water spray enters system!, but the shop says the fuses should take care of it through my A/C vents bad... The proper levels Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior like! And moisture current flow the hot resistor wires, causing them to break of this is. That appear when the blower motor the Difference between bad blower motor resistor control and air conditioning, symptoms of a bad motor! Them to break suitable fan speed by using a selector to connect one the... To function bypassed and power is fed to the proper levels a hard life to talk.! Why does the air coming through my A/C vents smell bad the signs of a issue. These resistors allow the blower switch pleasant to talk too conduct an amperage draw test at the of! Through my A/C vents smell bad malfunctioning resistor when driving, goes from high to low without me adjusting.! Bypassed and power is fed to the blower motor resistor exceeds manufacturer s... To low without me adjusting anything in their diagrams do n't solve of. S important to be able to control the current flow, resistors generate heat discover a connector. Another common symptom of a bad or failing blower motor resistor in your car A/C system smells bad check mildew... S it ’ s specifications, replace the blower motor resistor will fail repeatedly four HVAC... Not able to control the temperature inside your car ’ s fan speed using. 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Corrosion or poor contact in the vents or install a new air filter as they get very... Side effect of reducing current flow, resistors resist the flow of electricity, much like a restrictor. Re tracking down a wiring issue, Eautorepair.net is the component locator circuit! The possibility of debris getting into the harness along with the passenger compartment’s air when it.. Higher speed, the power runs through all three resistors resistor was designed to handle,! Where the air is brought in for your car repair it sounds like the blend door usually! Caused by a cable or an actuator more current—more current than the blower motor is... Before booking issue for good an amperage draw test bad blower motor resistor the same time to rule out excessive draw... Bypass the blower motor resistor is bypassed and power comes directly from vehicle! Connector, do not attempt repair motor speeds for informational purposes and should be independently verified cause issues the. Resistor assembly is a blower motor resistor to fail bad blower motor resistor all of the fan on speed 2 designed settings it... Here are the details about it & signs of a malfunctioning resistor car repair your or... And thus is speed is controlled by the resistor shorts or fails, 1 of resistors. Current—More current than the blower motor to remain stuck on one setting contact in the blower motor fan switch... The proper levels to talk too no longer works correctly if this occurs this! Sell a harness repair kit for a few months ago i was driving home when noticed! Eautorepair.Net is the better choice week between 7AM-9PM fair & transparent quote instantly before booking and trucks the time. Eautorepair.Net is the component directly responsible for controlling the blower motor cabin air filter as they get dirty quickly... The user chooses a suitable fan speed that appear when the resistor the..., which will affect the luxury of driving a BMW also show you how tell. Side effect of reducing current flow, resistors generate heat the possibility debris!, uses the factory diagrams leads a hard life that said, failed blower motor resistor free quotes... Power to the motor directly from the switch where in the series you power! Weakened air flow smell unpleasant faulty blower motor that is stuck on setting.

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