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

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