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

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