The blower motor in your car is under the passenger side dashboard. The resister block used on many models is coupled with a control module. Check the cabin air filter for clogging. This means when you remove the part you will instantly see that it has melted spots. 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. Itâs possible to get a short circuit or burned-up motor that could produce smoke and burning smells, but get under the hood and make sure itâs not also something else. Carmakers use these three common wiring methods to supply power and ground to the blower motor in a manual system using a blower motor resistor. Remove the screws, and swap out the resistor module. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. Fixed the problem. Replace blower motor. The diagnostic charts provided in car repair manuals are often very basic and servicing the parts doesn’t require any special tools. If you have a three or four speed blower motor, remove the â¦ Bookmark this automotive AC blower page or share. You can find this tutorial in Spanish here: Verificando el Motor del Soplador del Aire Acondicionado (4.0L Ford) (at: autotecnico-online.com). However, youâll probably find it uncomfortable to have the blower running at one speed setting the entire time. ECM X13 Blower Motor Troubleshooting!8:06. I'm thinking there would be no reason for Mercedes to design a whole new blower motor, just the housing, but I'm thinking maybe the actual blower is the same as Mercedes uses on some other cars, maybe even all the Germans share the same supplier. Place them in small container. Purchase a new resistor module at the auto parts store (usually less than $25). Checked for incoming resistance ground to the blower, from the dash control switch and it works. Disconnect it from the motor shaft and set aside. Troubleshooting Guide; Whether it starts with an ominous rattling, the smell of gas or a warning light on your dashboard, unidentified car trouble can make your stomach churn. Even better an automotive meter to verify good power and grounds at the blower motor. However, there are a few vehicles out there that make it extremely difficult. The resistors are arranged in series to reduce the voltage in steps, depending on where in the series you apply power. Remember, you need a good ground to complete the circuit. If you have a variable speed blower motor, replace the blower motor speed control module. Heating systems with just 3 or 4 speeds use a motor resistor along with the speed switch to regulate the motor speed. This is to prevent the circulation of ice-cold air on cold winter days when heat is selected on the climate control. When that happens, you lose that speed. Blower resistors can burn out. If itâs good, check for debris on the evaporator or heater. Replace blower motor. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Harsh shift, rough idle, GM service bulletin #PIP5446A, No start, no crank, start then stall on GM trucks, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. Bad bearing in blower motor. In most cases, the controller receives a digital input from the speed switch or HVAC control head. When I diagnose electrical problems, I start at the load and work my way back through the circuit towards the battery. So you may have high speed, but no lower speeds. With the amount of current or amps flowing through this circuit, spikes can easily take out the fuse and damage relays. I have a 2001 Nissan Quest. I also have a page focused on four GM HVAC issues on cars and trucks from the 2000s. Check for bad fuse or bad high speed relay. 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. General Discussions. However, when it comes to the interior fan I will usually go right for the fuse and check that first. The blower motor controls on your vehicle are worth maintaining because they allow you to determine how much air is sent through the blower motor and into the cabin. The reason Iâm not including the motor resistor as a suspect is because it usually only controls the lower speeds. If you start at the blower motor, and check resistance in the circuit, you will find the problem in â¦ 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. I shut the car off to fill with gas. The most common symptom of a faulty blower motor resistor is a blower fan that only works on one speed, usually high. Variable speed blower motors donât use a blower motor resistor. Thread starter Buzzie8; Start date May 9, 2009; B. Buzzie8 Member. Could the resitor be bad again. Blower motor doesnât work in cold weather. That’s why they’re not far from the squirrel cage itself. A lack of airflow from your vents is a clear indicator that it may be time for a heater blower motor replacement. 15. DIAGNOSING THE PROBLEM Blower motor breakdown can be the result of anything from old age to failed bearings, high amp draw, electrical failure in the windings, dirt accumulation, and more. You’ll have to decide on your own if this is within your skill level. As an Amazon Associate I earn from qualifying purchases. There’s also a 30 amp Maxi fuse in the engine bay convenience center. Locate the retainer clip in the center of the blower wheel. Make sure you check the connector side for damage. Be careful, on some vehicles when the engine is running the interior fan is in constant operation at a low speed. So a half speed driver request will result in the blower motor controller pulsing the ground connection off twice as often as when the fan is running at full speed. 2. As more resistance is applied to the circuit the slower the interior fan motor will spin. A car heater blower is a part consisting of a DC motor driving a tangential fan, with the purpose of blowing air to control the internal environment of the car. I have a dedicated page on how to find electrical shorts if you need more assistance in that area. Blower motor does not function. Select the department you want to search in. They mount the resister block in the air conditioner or heater case, because of the generous amounts of air flow. I checked all three fuse locations, the owners manual does not show a blower motor fuse, HVAC fuse is not blown. Paint This: How Long Does Paint Protection Film Last? This is to provide an ample supply of fresh air in the interior compartment even when no climate control mode is selected. As the relay is the switch that supplies current to the blower motor, if it fails internally, then power will be cut off from the blower motor circuit, causing the motor to no longer function or blow any air from the vents. Checked for battery at the blower, when the car is running. Blown fuses If it doesnât, the motor is bad. This one has been a big issue over the years. Because most automatic systems use an electronic motor controller while manual systems usually use a blower motor resistors to obtain 3 or 4 different speeds. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsâperiod. As an example on GM cars from the 80s and 90s there’s a 20 amp under the dash. Also, does your blower motor have just a 3 or 4 speeds or do you have a variable speed motor where you vary the speed by turning a dial? A month later the blower motor stopped working and I replaced that and it worked fine. The squealing noise happens most often in the winter during cold startups and may disappear as the motor heats up. Check for full airflow at the vents. Unscrew all the screws on the blower motor. Location diagrams will also point out important parts in the climate control system such as relays, switches and fuses. If the blower motor doesn't work at all, the blower motor itself must be tested first. If still doesnât run, replace the motor. Refer to the wiring diagram for your vehicle and check for continuity on all three resistors and speed switch setttings. It is an integral part of the air condition system, which is capable of blowing warm or cold air. Do you set the temperature and the system keeps that temperature or do you have to adjust the temperature up manually and then turn it down once the cabin heats up? Car Washes. In one design, the car maker supplies battery power to the speed switch, which switches the power to the appropriate connection on the blower motor resistor. This can be annoying, but troubleshooting is easy. A burned blower motor or motor wiring isnât going to total your car, but you better be sure thatâs where the smoke is coming from before continuing on the road. If you have a three or four speed blower motor, remove the blower motor relay. Anything from no air circulation to annoying or noisy operation. This is a dead ringer symptom of a bad blower motor resistor, not a bad speed switch. You can learn more about this auto repair website over at the Homepage for YouFixCars.com. Acts like a fuse is blown. If there is no power, check the resistor for power. Variable speed motors are most often used in vehicles with automatic climate control. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. Why do you need to know that? Alldatadiy.com, on the other hand, uses the factory diagrams. 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. At the bottom of this page is a video that’s very popular. If itâs good, refer to a wiring diagram for your vehicle and conduct these tests: Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls. 3 months ago I replaced the blower motor resistor because it only worked on high. If the test light reveals no voltage at the fan with a good fuse, I confirm a solid ground before I move on. Nevertheless, often when this component fails, it suffers catastrophic heat damage. Tools and materials needed: â 4-in-1 screwdriver â Nut driver. A likely cause for a busted AC or heating unit is a damaged blower-motor. Depending on the manufacturer and model, a blower motor resistor can go anywhere between $3 and $335 on CarParts.com . It could also smell like burnt hair. If your test reveals power going into the resister with a solid ground present and nothing coming out, a failed component becomes likely. 7 Awesome Reasons Why You Should Buy a Truck, Here’s Why You Should Consider Speakers From American Bass Audio, 4 Tips for Towing a Cargo Trailer From Start to Finish, The Most Important Tips for Buying Used Motorcycles. If youâre tracking down a wiring issue, Eautorepair.net is the better choice. Use a new furnace filter replacement to replace dirty filters that can block air flow Replace the resistor. (The black wire is usually the negative.) Replace the blower motor. Exhaust leaks can become a serious issue if they aren't taken care of early enough. A variable speed motor is controlled by a digital speed controller. This electrical component is used to control the air conditioning system of a vehicle. You can’t fix what is not broken. On average, a Carrier blower motor replacement costs 0-0. These resistor modules often fail from heat stress that can melt plastic connectors. Two common reasons for this to happen would be drawing too much amperage or a problem with the resister block mentioned above. If you donât see battery voltage, youâve got a wiring or relay problem on the power supply side of the circuit. The majority of the time, a failure will be found in the blower motor resistor or the motor. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. The bearing is not replaceable. The module uses that information to pulse either power or ground to the motor. If you have a variable speed blower motor, replace the blower motor speed control module. Blower motor troubleshooting. Or, carmakers can opt for a motor resistor AND a high speed relay. And when one or more of these resistors burn out, youâre usually left with only one blower â¦ See the wiring diagram below for a typical variable speed motor setup. If so, you’re not alone. If there is power, the motor is bad. On all systems, a failed blower motor is least likely. The bearing is not replaceable. That saves a lot of time because you donât have to refer back to the component locator or circuit locations. Here are the blower motor fix steps: Determine if you have a manual or automatic heating system in your vehicle? However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. It’s used to control the output speed of the blower motor. The resister block used on many models is coupled with a control module. Troubleshoot A Car Blower Motor; Replacing A HVAC Blower Motor. Often there are two separate circuit fuses and they can be in separate panels. Learn how the rest of the climate control system works and discover why interior fans are an important part of the automotive AC system. Photo: familyhandyman.com. See the wiring diagram for that setup below. Some drivers and car owners might complain about these normal operating conditions. I can’t tell you how often I have found a critter nest in the heater case. A blower motor problem is easy to fix if you understand how your particular system is wired. No noise, no prior problems. Here are four of the most common …, Over 216 million tires were sold in the United States …, Do you love muscle cars? Many, many times a car or truck will come into the shop with the customer complaining that their blower motor doesnât work, or only works on high speed, etc. Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. RepairPal makes it easy to find a trusted mechanic to look under the hood for you. Finding the location of the fan assembly is a good place to start diagnosis. 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. 1991 Ford F 150 Blower Motor Wiring Diagram. Disconnect the electrical connector at the blower motor. If you check all the fuses and they’re good, the next recommended step is to continue diagnosis by using a test light. Features to Consider. A blower motor resistor is an adjustable resistor. Testing the blower motor is as simple as applying battery power and Ground to the blower motor terminals. If you ignore the noise, the bearing will continue to wear to the point where the motor wonât start at all. Replace the blower motor. If you donât see good ground, locate the ground connection and clean it. Itâs used to control the output speed of the blower motor. TEST 1: Applying Power And Ground To The Blower Motor The blower motor gets power and Ground from the 2 wires that connect to it. Start by checking the blower fuse and HVAC controller fuse. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. You can use the component location diagram in your online service manual to pinpoint the specific location of the squirrel cage (fan blades). Use a multimeter to check for the presence of battery voltage in the connector with the key in the RUN position and blower speed set to HIGH. Common Problems with Blower Motors. There is no battery to operate the blower. At that point the suspects are the blower motor speed control module (most likely) or the HVAC control head (less likely, but not unheard of). Run a fused jumper from the battery to the power side of the motor and connect a temporary grounding jumper to the other motor terminal. This means you can quickly turn the heater up as a high as it will go on a cold morning, so you can clear the windows of fog. If it still doesnât run, check the resistor and speed switch for continuity issues. 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? Also, check the fuse for the control side of the high speed relay. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. With our wide variety of replacement AC heater blower motors, AutoZone can help make your ride enjoyable again - no matter what you drive. This is a symptom of a failing blower motor bearing. A resister block will adjust its total resistance as selected by the driver from the switch. Swap the high speed relay with another relay with the same part number. In those applications, the HVAC control head is a digitally controlled unit and uses various sensor inputs to determine when to supply heat. In a situation where the motor doesnât work on any speed, the most likely causes are: a blown power supply fuse, a bad motor ground connection, bad motor speed control module or a failed motor. The ac blower motor is usually located in the AC duct housing or heater case assembly. There are 4 screws that hold it up under your dash. Pictured on the right is an interior fan resister assembly from a late 70s GM car or light truck. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. If you need to dig into your doors, dash or console, Alldatadiy.com is the better choice because Eautorepair.net doesnât any interior or exterior trim or body part removal. Or, carmakers can supply power to the motor and control blower speeds on the ground side of the circuit. See the wiring diagram below for that setup. This is a symptom of a failing blower motor bearing. Blower motor is drawing too much power. A third quick and simple troubleshooting step for your furnace blower motor is to make sure the filters and vents are clean and free of dust and debris. Instead they use a blower motor speed control or a power transistor. This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. If you see battery voltage in the connector, connect 1 meter lead to the power terminal in the connector and the other lead to the ground connector. Run a fused jumper from the battery to the power side of the motor and connect a temporary grounding jumper to the other motor terminal. I often find DIY car mechanics will skip checking the ground and move right onto parts replacement mode if they find voltage to the fan motors. Reduced airflow also causes the blower motor to work harder, draw more current and that can cause repeat blower motor resistor failures. If the motor runs at full speed, youâve confirmed the motor is not the problem. No prior problems. Blower motors generally donât fail out of the clear blue. What Is the Average Cost of a Car Accident? Here's a handy guide on …, Have you noticed a foul smell coming from your car? The easiest way to check for a failure is to start the vehicle and turn the climate control on. You should see battery voltage (12+). The control head then sends a command to the motor controller to change the speed to the driver’s preferences. Rotated all the PDC relays around, they have the â¦ Watch the example video below. Based on the driverâs input to the blower speed switch, the HVAC control head sends a digital signal to the blower motor speed control module. If you can get to the bottom of the dashboard there should be a plastic panel on the passenger side you can remove to expose the blower motor. The connector on your Ford's blower motor will have a BRN/ORG wire and a PNK/WHT wire. If the motor stops, replace the relay. With that said, failed blower resistor assemblies don't solve all of the possible failures. Ford blower motor resistor problems remain the most common solution to interior fan malfunctions on Ford cars and trucks. Blower motor doesnât shut off. …, When you need your automobile to always stay in great …, Every year, more than 6 million car accidents take place …, blower motor problems page for Chrysler and Dodge owners, 4 Possible Reasons Why Your Car Smells Like Burning Rubber, 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. Next I’ll head to the resister block assembly and check for power coming out of the resister itself. They do this for cooling purposes. This is usually the case after a blower resistor failure on one or more speed settings. Don't ignore it! GM called this astro ventilation. Disconnect the electrical connector. The motor should run on high speed. This can be a bad blower motor resistor or a failed speed switch. Make sure the ground side of the high speed relay is working. If it’s in the engine bay you’ll most often find it near the firewall. The blower motor relay is the electrical switch that is used to supply the power for the vehicleâs blower motor. 1st covered under the 5 year warranty, second 0 â¦ As more resistance is applied to the circuit the slower the interior fan motor will spin. Is there a breaker or relay, and where is it located. Today I get in the car and it only works on high again. To obtain the requested speed, the motor controller rapidly pulses the ground circuit on and off. Disconnect the negative and positive power supply. Most car manufacturers use a series of resistors to make the heater blower motor run at different speeds. If you get a good ground reading, the problem is most likely a bad motor. Bad bearing in blower motor. A resister block will adjust its total resistance as selected by the driver from the switch. Blower motor problems can cause many driver complaints. The blower motor resistor assembly is a common malfunction on them. In fact, they sell a harness repair kit for a few bucks that you’ll need to fix the issue for good. In those applications, the motor resistor reduces power for the slower speeds and the blower motor has a permanent ground connection to complete the circuit. If airflow seems restricted or lower than normal, check the cabin air filter. In most cases, their diagrams are right from the factory manuals. They often locate these parts in the heater case near the blower motor. Special Note: I put together a separate blower motor problems page for Chrysler and Dodge owners. If you do find a burnt fuse continue to test the system and try to find out why it got toasted. I believe General Motors first used it in the 70s. What's going on! If you do see battery voltage, the problem is either a bad motor or a problem on the ground side of the circuit. Using the above troubleshooting steps will help you decide if you need to replace your air conditioner blower motor. Hyundai Blower Motor Infiniti Blower Motor Isuzu Blower Motor Jaguar Blower Motor Jeep Blower Motor Kia Blower Motor Land Rover Blower When it comes to climate control problems, a busted HVAC blower motor is a big one. TEST 1: Applying Battery Power And Ground To The Blower Motor. Unfortunately, youâll need a digital scope or scan tool to test those components, so your only option may be to replace the parts one at a time. Reconnect the electrical connector and youâre car heater blower motor is back in business. To do this, go to each of your home vents and ensure they are open and clear. 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 replacement of parts in the blower motor system are some of the easier repairs to perform on the automobile. You can still drive your car despite a faulty blower motor resistor. Check for airflow restrictions in the duct, paying attention to debris on the evaporator or heater core. How Often Do Brake Rotors Need to Be Replaced? Fixing your own problems in this system is usually well within the reach of the average do-it-yourself mechanic. Check the blower motor at its two-wire connector for power. Decreased airflow causes the blower motor resistor to overheat and fail. âThe most common cause is dirt accumulation due to lack of maintenance,â said Tom Beaulieu, president of Bay Area Services Inc. in Green Bay, Wisconsin. See the wiring diagram for that setup below. They include wiring diagrams and technical service bulletins. 1. The highest blower speed usually bypasses the motor resistor completely, so itâs not a suspect if the motor doesnât work at any speed. If the motor runs, locate the ground connection and clean it. Restarted car after filling and the blower motor failed to work. If it runs, youâve solved the problem. Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. They always mount the interior fan near the evaporator and heater cores. Disconnect the electrical connector at the blower motor. The heater blower motor is located behind the glove compartment of your vehicle. On vehicles with early climate control systems the fans may not activate until the engine reaches a specific temperature. In most cases, they start to fail by making a high pitched squeal or screeching noise that indicates the bearing is failing. The plug the connector back into the motor and check operation. It reviews best practices for diagnosing common electrical problems. Decreased airflow causes the blower motor resistor to overheat and fail. The primary difference is the type of inputs to the motor control. Typically it's done by measuring the voltage at the blower motor connector when it's turned on. Depending on the exact location of the blower motor (on your specific 3.8 liter equipped GM vehicle) you can test it on the car or you may have to remove it for ease of access. Is least car blower motor troubleshooting easy to fix the issue for good blower speeds the. To make the heater blower motor resistor, not a suspect if motor! And car owners might complain about these normal operating conditions to replace air. DoesnâT work at any speed during cold startups and may disappear as motor. Digitally controlled unit and uses various sensor inputs to the blower motor at its connector... Their diagrams 's done by measuring the voltage in steps, depending on the automobile difference is type! Pitched squeal or screeching noise that indicates the bearing will continue to test the system and try to electrical... 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