Often a visual inspection of the resistor reveals the problem. What Is the Average Cost of a Car Accident? The way this circuit works is all on the ground side. Common Problems with Blower Motors. When you adjust the fan, the heater blower motor resistor allows the fan to run at several different speeds. 12 volts is always present at the motor, and the switch in your dash provides the ground. Diagnostic procedures vary. The user chooses a suitable fan speed by using a selector to connect one of the resistors in the blower resistor pack. What are the symptoms of a bad blower motor resistor? Watch the example video below. So effectively, the lower the voltage, the lower the speed. The replacement of parts in the blower motor system are some of the easier repairs to perform on the automobile. With that said, failed blower resistor assemblies don't solve all of the possible failures. Honda Blower Motor Resistor/Transistor Repair Early 2000 model year Honda Accords, Civics and CR-Vs suffer from a blower motor malfunction where the air conditioning controls will continue to function but the blower motor will not spin, causing no air to come out of you vehicle's vents. You’ll have to decide on your own if this is within your skill level. The bulletin recommends replacing the rear power transistor as a solution. Typically it can be activated by pressing and holding different buttons. The blower motor resistor controls the speed of the blower motor indirectly by relaying electrical current to the blower motor control module. Fortunately Volvo changed the layout at the Volvo 700-series (the blower motor was moved to the passenger side of the car, just behind the glovebox), resulting in a much easier way to access the heater motor and resistor for the blower. Worn blower motor causes repeat blower motor resistor failure. See the photo of a Ford blower motor resistor. This is to prevent the circulation of ice-cold air on cold winter days when heat is selected on the climate control. The GM bulletin 06-01-39-002C describes this problem that happens in cold weather. In this diagram, the fan switch is set to the speed "1", so the blower motor current is reduced by three resistors (R2 + R3 + R4) connected in series. The most common symptom of a failed blower motor resistor is when the heater fan only runs at the highest speed setting (4 or 5) and doesn't work at low speeds. In most modern cars, the blower motor resistor or the control module are installed inside one of the ducts in the HVAC system, close to the blower motor. 5 Reasons You Should Invest in One Today, 5 Tips for Smooth Car Maintenance in Winter, Handyman: 10 Updates You Can Make to Your Car on Your Own, Drive With Confidence by Buying the Best All Seasons Tires for Snow, In-Depth Guide to Restoring Muscle Cars for Beginners, 5 Must-Have Qualities When Choosing a Car Repair Shop. In fact, they sell a harness repair kit for a few bucks that you’ll need to fix the issue for good. This thread at f150online.com shows where the resistor is located. If your heater blower is totally dead, do check your fuses first. Within the blower motor resistor assembly is a non-user serviceable thermal fuse. Location diagrams will also point out important parts in the climate control system such as relays, switches and fuses. What is the difference? Blower Motor Resistor Testing An A/C blower motor resistor uses resistance to control the speed of the blower motor. However, when it comes to the interior fan I will usually go right for the fuse and check that first. If the resistance is out of specs, the resistor must be replaced. The power transistor has 4 wires: two come from the climate control system control unit, one is the ground, one goes to the negative terminal of the blower motor. Fixing your own problems in this system is usually well within the reach of the average do-it-yourself mechanic. What Does a Flashing Check Engine Light Mean? Even better an automotive meter to verify good power and grounds at the blower motor. Most blower motor problems are resistor related, a problem often overlooked. If so, you’re not alone. A failed power transistor was a fairly common cause for not working blower motor in some Honda and Acura vehicles. In many cars it's fairly easy; the blower motor is located behind the glove box and held by 3-4 screws. That’s why they’re not far from the squirrel cage itself. In 2008-2011 Ford Escape / Mazda Tribute, the blower motor resistor is located on top of the HVAC unit air duct behind the glove box. In most cases when a blower control module fails, the blower motor doesn't work at all. I have a dedicated page on how to find electrical shorts if you need more assistance in that area. Another way is to check the voltage at the blower motor, the blower motor control module and other parts of the circuit according to the service manual. For example, as you can see in this photo, the blower motor resistor in this Ford Escape has failed due to corrosion. He paid $50 to diagnose and $112 to replace the resistor at a local Ford dealership. 7 Awesome Reasons Why You Should Buy a Truck. One of the symptoms of a worn out blower motor is that it can intermittently produce a loud screeching noise when running. Problems with a blower motor resistor are common in many cars. Many blower resistors control current to the blower motor in all speeds except high. If you do find a burnt fuse continue to test the system and try to find out why it got toasted. This means that the current running through the blower motor, and thus is speed is controlled by the resistor value. This means when you remove the part you will instantly see that it has melted spots. In the 2008-2011 Ford F150 the blower motor resistor is also located behind the glove box, but is installed in the right side of the plastic air duct. As obvious as it may sound, one of the most prominent symptoms that you can be on the lookout for is a lack of... High speeds only. If there is no voltage at the motor, the entire blower motor circuit must be tested, starting from a fuse. If the resistor isn't replaced for some time after starting to act up, it may fail completely, leaving the entire system useless. Fix your heater blower resistor problems from £2.99 Over the last ten years or so, motor manufacturers have introduced more sophisticated Heater Blower Resistors to control the blower fan motor for the heater and, on many, the digital aircon too. Sometimes, a blower motor resistor might fail due to problems with the blower motor itself. This happens often in many cars. In some cars (e.g. If the blower motor doesn't work at all, the blower motor itself must be tested first. For example, the Honda bulletin 03-048 described a problem where the blower motor for the rear HVAC system in the 2003 Pilot would not work at all speeds. Pictured on the right is an interior fan resister assembly from a late 70s GM car or light truck. How the speed of the blower motor is controlled. It will be located between the heater and air conditioning control knobs and the blower motor itself. Attach the clip lead of the test light to a good ground like a bolt screwed into metal, and touch the sharp probe end to the terminals on the fuse. Two common reasons for this to happen would be drawing too much amperage or a problem with the resister block mentioned above. The most common symptom of a failed blower motor resistor is when the heater fan only runs at the highest speed setting (4 or 5) and doesn't work at low speeds. No air from the vehicle’s … In newer applicati The solution here is to ask an Expert. If it’s in the engine bay you’ll most often find it near the firewall. Many dealers have the part in stock. …, When you need your automobile to always stay in great …, blower motor problems page for Chrysler and Dodge owners. How Often Do Brake Rotors Need to Be Replaced? What you should know when buying a used car, How to check the engine when buying a used car, Air fuel ratio (A/F) sensor, how it works, Why a car won't start troubleshooting tips. Testing the voltage at the blower motor. This means after replacing the blower motor resistor, check if the blower motor runs freely and doesn't make any noise. However, other factors can cause the blower motor resistor to fail prematurely. Find out what …, Your car could be a fantastic piece of machinery that has never given you a problem. Its a good idea to check other like models to determine if there is a problem, or is it just operating as per design intent. There’s also a 30 amp Maxi fuse in the engine bay convenience center. older GM trucks), a failed blower control module or processor can cause the blower motor to continue running even with the ignition OFF. Problems with a blower motor resistor are common in many cars. GM called this astro ventilation. Reconnect the electrical connector and you’re car heater blower motor is back in business. On most American and import cars and light trucks, the blower resistor is located near or on the blower motor. At the bottom of this page is a video that’s very popular. They do this for cooling purposes. The resister block used on many models is coupled with a control module. Sometimes, the mechanical resistance to the motor rotation causes an excessive electric current that can overheat and prematurely damage the blower motor resistor. Hyundai owners are often stuck for answers when they are up against blower motor problems. For example, this happens when the fan blade is jammed by a foreign object or when the motor bearings are worn out and it doesn't spin freely. Honda blower motor control module (power transistor). It's held by two screws and is easy to replace. More than likely, it will be attached to the ducting near the blower motor so that it is kept cool while it is in use. If the resistor isn’t working properly, then you’ll experience concerning and inconvenient symptoms in your BMW’s cabin. When the same problem occurred two years later, he ordered the part online for $25 and replaced it himself. In the 2008-2011 Ford Escape, the resistor is located behind the glove box on top of the HVAC unit air duct. Turn the key to the on position and set the blower speed knob to LO . Read on to see how Experts have analyzed some common blower motor issues and provided answers to questions. However, over time, that …, No matter what kind of car you have, they all …, The winter months can be hard on your vehicle. Sometimes it doesn't fail completely, but causes the blower motor to stop working intermittently or run at various speeds. Basics Of Troubleshooting The Blower Control Resistor. See also: This Ford blower motor resistor has failed due to corrosion, A failed resistor tested with an ohm-meter. Blower motor resistor wiring repair kit £ 43.80 Excluding vat £ 36.50 This item is currently out of stock but can be back ordered. Watch these YouTube videos for more info. Be careful, on some vehicles when the engine is running the interior fan is in constant operation at a low speed. Locate the fuse for the blower motor in the owners/service manual. It's held by two screws. Depending on the year, make, and model you may find this component both in the interior cabin area or outside in the engine compartment side of the firewall. The resister block used on many models is coupled with a control module. They often locate these parts in the heater case near the blower motor. Finding the location of the fan assembly is a good place to start diagnosis. Mechanics at a dealership can diagnose the HVAC system with a scan tool. Blower in car stopped working, took car to dealer, they came back and said it's the resistor for the blower motor. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. BMW calls the blower motor control module a Final Stage Unit and it also is fairly common to fail. It's located inside the dash, often on the opposite side of the steering wheel or inside the engine compartment on the firewall. See: how to check a fuse in a car. A blower motor resistor is a simple electric resistor. Often there are two separate circuit fuses and they can be in separate panels. However, there are a few vehicles out there that make it extremely difficult. This diagram shows how the blower motor resistor is connected in a typical car. Typically it's done by measuring the voltage at the blower motor connector when it's turned on. Went to AutoZone and asked about it. You're driving and something on your dashboard catches your eye: a flashing check engine light! Is fixing up …, Over 216 million tires were sold in the United States …, Do you love muscle cars? I believe General Motors first used it in the 70s. The blower motor resistor assembly is a common malfunction on them. A blower motor resistor or a blower motor control module is the part that controls the speed of the blower motor. In most cases, a blower motor resistor fails due to corrosion or … Disconnect the Heater Blower Resistor from … Adding resistance to the electric circuit reduces the current in the circuit. A resister block will adjust its total resistance as selected by the driver from the switch. The blower motor replacement costs from $320 to $650, depending on the car. As an example on GM cars from the 80s and 90s there’s a 20 amp under the dash. In the setting "2", there are two resistors connected in series, and in "3", there is only one resistor. Your …, Do you have a passion for cars? Remove the screws, and swap out the resistor module. See these YouTube videos for more info. Check this post, scroll down the page. For example, in the 2009 Honda Accord, the service manual describes the procedure as follows: Turn the ignition to ON. If there is a voltage at the motor (at least 4-6 Volt at low speed and 12 Volt at high speed), but the motor doesn't run, the motor is bad. Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. In some older cars and trucks the blower motor resistor is installed on the firewall, with the access from under the hood. The bulletin advises to replace blower motor control module. 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. That's why in some cars, the blower motor may still work in the "High" speed setting if the resistor is bad. Learn how the rest of the climate control system works and discover why interior fans are an important part of the automotive AC system. Unless a fault is correctly diagnosed and resolved, making replacements proves pointless. Cars with an automatic climate control system and vehicles where the blower speed can be adjusted gradually are equipped with an electronic blower motor control module, see the photo. This is to provide an ample supply of fresh air in the interior compartment even when no climate control mode is selected. (The black wire is usually the negative.) GM calls it Linear Power Module (LPM). Next I’ll head to the resister block assembly and check for power coming out of the resister itself. With the amount of current or amps flowing through this circuit, spikes can easily take out the fuse and damage relays. I participate in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. In others it might be located inside the dash (e;g Mazda 5) which makes replacement difficult. Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. The blower motor resistor can usually be found under the dash as well. Please contact us for availability. The blower motor resistor is the component directly responsible for … The blower motor resistor is responsible for powering the blower motor directly. A new blower motor resistor will cost you around $20 at the dealer. If power is supplied to blower motor through the speed switch and blower motor resistor: Disconnect the electrical connector at the blower motor. The author of this blog shared his experience of replacing the blower motor resistor in Jeep Liberty. It reviews best practices for diagnosing common electrical problems. Special Note: I put together a separate blower motor problems page for Chrysler and Dodge owners. The service manual describes the testing procedure for each code. This is done, so the resistor or a control module is cooled down by passing air. The current flow is shown in blue and red. See the photo. It took several hours to replace the heater motor and/or resistor. This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. The blower motor control module (Honda calls it Power Transistor) supplies the ground. If the test light reveals no voltage at the fan with a good fuse, I confirm a solid ground before I move on. Disconnect the negative and positive power supply. The ac blower motor is usually located in the AC duct housing or heater case assembly. As more resistance is applied to the circuit the slower the interior fan motor will spin. Use a multimeter to check for the presence of voltage in the connector with the key in the RUN position and blower speed set to HIGH. The blower motor resistor or control module replacement is not very expensive. Repair guide Stage 1 - Investigate. The service manual advises measuring the voltage at the blower motor, then if not OK, at the power transistor and so on. The blower is still not working after replacement. Are Maintenance-Free Batteries Better? On vehicles with early climate control systems the fans may not activate until the engine reaches a specific temperature. The heater blower motor resistor is an electrical component that is located between your car’s ventilation fan (or blower) and its power source. The heater blower motor is located behind the glove compartment of your vehicle. For example, in the mentioned 2009 Honda Accord, the + 12V power is supplied directly to the blower motor through the fuse and then through the relay. The system enters the self-diagnostic mode and at the end of it, if there is a problem, the fault code will be displayed on the display. A resister block will adjust its total resistance as selected by the driver from the switch. Things like leaves, twigs, nuts, pieces of a ripped cabin filter can jam the blade of the blower motor. See, for example, this YouTube videos, add make and model of your vehicle. The blower resistor is connected in series with the blower fan. If there is a voltage at the motor (at least 4-6 Volt at low speed and 12 Volt at high speed), but the motor doesn't run, the motor is bad or jammed. as a blower motor ages and wears, it can draw more current—more current than the blower motor resistor was designed to handle. If you need a proper diagnostic procedure, we posted several links where you can access a service manual for your car for a subscription fee. If a scan tool is not available, in many cars with an automatic climate control system there is a self-testing or diagnostic mode. You should see battery voltage (12+). In some GM trucks, a blower motor control module failure can cause the front blower motor to stop working or run after the vehicle has been shut off. As we mentioned earlier, a blower motor resistor isn’t necessary in two instances. In the long run this could save considerable time and money. The blower motor resistor might have to be replaced. As more resistance is applied to the circuit the slower the interior fan motor will spin. When up against a blower motor problem always ask an Expert. If a blower motor is bad, it will need to be replaced. It’s used to control the output speed of the blower motor. No Air. A repair manual can tell you where its location is in your … Blower motor resistor repair. On speeds 1-3 the ground is re-routed through the resistor pack and on high speed it bypasses the resistor pack and the motor gets full voltage. In that case, the blower motor resistor will fail repeatedly. If you check all the fuses and they’re good, the next recommended step is to continue diagnosis by using a test light. If your test reveals power going into the resister with a solid ground present and nothing coming out, a failed component becomes likely. Most of the time, simply replacing the blower motor resistor assembly will take care of the problem. The Ford blower motor resistor assembly, covered by this tutorial, has 3 different resistors in series and depending through which resistors the blower motor current is flowing thru' (on its way … There can, of course be other causes, like a faulty blower motor, or a blown fuse, but the two main causes above are far and away the most common. Remember, you need a good ground to complete the circuit. You can’t fix what is not broken. They always mount the interior fan near the evaporator and heater cores. For example, in this photo we measured the resistance of this blower motor resistor. In most cases, a blower motor resistor fails due to corrosion or overheating. Make sure you check the connector side for damage. Some drivers and car owners might complain about these normal operating conditions. For example, one of our colleagues had a problem with his 2011 Ford Escape: the fan only worked at the speed 4. Ordered a new one and replaced it. For example. These resistor modules often fail from heat stress that can melt plastic connectors. Your local mechanic or any small repair shop should be able to diagnose the problem. 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. In our case the ohmmeter shows open circuit, which means the resistor has failed. Oh no! The fuse is what usually blows. In some older cars, a blower motor resistor was installed on the firewall with the access from under the hood. We have seen instances where a worn-out blower motor causes a recently replaced resistor to fail again. Press and hold the OFF button and within 10 seconds press and release the Window Defogger button five times. Purchase a new resistor module at the auto parts store (usually less than $25). Bookmark this automotive AC blower page or share. Test the fuse, with the ignition key on, using the 12-volt test light. What are the symptoms related to a bad heater blower motor resistor? When I diagnose electrical problems, I start at the load and work my way back through the circuit towards the battery. When several resistors are connected in series, the total resistance increases and is equal to the sum of individual resistances. The blower motor resistor is responsible for controlling the blower motor speed. Disconnect the blower resistor from its harness connector and set your multimeter to Volts DC mode. Ford blower motor resistor problems remain the most common solution to interior fan malfunctions on Ford cars and trucks. I can’t tell you how often I have found a critter nest in the heater case. The diagnostic charts provided in car repair manuals are often very basic and servicing the parts doesn’t require any special tools. Start by looking for the blower fan resistor. A good indication that you need a blower resistor is if your blower is only working on the highest speed setting. Disconnect the electrical connector. 3. In some cars, a failed blower motor resistor can cause a heater fan to stop working completely. If the resistor shows no visual damage, the resistance between terminals must be checked and compared to specifications. 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