If you’re tracking down a wiring issue, Eautorepair.net is the better choice. No noise, no prior problems. There are 4 screws that hold it up under your dash. (The black wire is usually the negative.) However, you’ll probably find it uncomfortable to have the blower running at one speed setting the entire time. I have a 2001 Nissan Quest. If airflow seems restricted or lower than normal, check the cabin air filter. You can find this tutorial in Spanish here: Verificando el Motor del Soplador del Aire Acondicionado (4.0L Ford) (at: autotecnico-online.com). 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. Replace the blower motor. …, 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. Bookmark this automotive AC blower page or share. Use a new furnace filter replacement to replace dirty filters that can block air flow The resister block used on many models is coupled with a control module. Blower motor does not function. Make sure the ground side of the high speed relay is working. Or, carmakers can opt for a motor resistor AND a high speed relay. A likely cause for a busted AC or heating unit is a damaged blower-motor. ECM X13 Blower Motor Troubleshooting!8:06. The ac blower motor is usually located in the AC duct housing or heater case assembly. Make sure you check the connector side for damage. As more resistance is applied to the circuit the slower the interior fan motor will spin. The bearing is not replaceable. Replace blower motor. These resistor modules often fail from heat stress that can melt plastic connectors. Blower motor is drawing too much power. Bad bearing in blower motor. If it runs, you’ve solved the problem. To obtain the requested speed, the motor controller rapidly pulses the ground circuit on and off. See the wiring diagram for that setup below. On all systems, a failed blower motor is least likely. If it’s in the engine bay you’ll most often find it near the firewall. With that said, failed blower resistor assemblies don't solve all of the possible failures. This is a symptom of a failing blower motor bearing. I have a dedicated page on how to find electrical shorts if you need more assistance in that area. RepairPal makes it easy to find a trusted mechanic to look under the hood for you. What's going on! Here's a handy guide on …, Have you noticed a foul smell coming from your car? If there is power, the motor is bad. The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor. See the wiring diagram below for that setup. Reconnect the electrical connector and you’re car heater blower motor is back in business. Common Problems with Blower Motors. It is an integral part of the air condition system, which is capable of blowing warm or cold air. 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. A burned blower motor or motor wiring isn’t going to total your car, but you better be sure that’s where the smoke is coming from before continuing on the road. If you don’t see good ground, locate the ground connection and clean it. Swap the high speed relay with another relay with the same part number. This is a symptom of a failing blower motor bearing. 1st covered under the 5 year warranty, second 0 … If so, you’re not alone. A resister block will adjust its total resistance as selected by the driver from the switch. 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. Fixing your own problems in this system is usually well within the reach of the average do-it-yourself mechanic. Checked for battery at the blower, when the car is running. In most cases, the controller receives a digital input from the speed switch or HVAC control head. The reason I’m not including the motor resistor as a suspect is because it usually only controls the lower speeds. The heater blower motor is located behind the glove compartment of your vehicle. Why do you need to know that? 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. 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. I can’t tell you how often I have found a critter nest in the heater case. Acts like a fuse is blown. On vehicles with early climate control systems the fans may not activate until the engine reaches a specific temperature. The replacement of parts in the blower motor system are some of the easier repairs to perform on the automobile. Alldatadiy.com, on the other hand, uses the factory diagrams. When that happens, you lose that speed. This electrical component is used to control the air conditioning system of a vehicle. If you get a good ground reading, the problem is most likely a bad motor. Blown fuses 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. If your test reveals power going into the resister with a solid ground present and nothing coming out, a failed component becomes likely. Start by checking the blower fuse and HVAC controller fuse. Disconnect the negative and positive power supply. The connector on your Ford's blower motor will have a BRN/ORG wire and a PNK/WHT wire. Car Washes. Check for full airflow at the vents. 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. You can’t fix what is not broken. Don't ignore it! Today I get in the car and it only works on high again. 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. 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. 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. 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. Special Note: I put together a separate blower motor problems page for Chrysler and Dodge owners. The squealing noise happens most often in the winter during cold startups and may disappear as the motor heats up. Photo: familyhandyman.com. The bearing is not replaceable. 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. Check for bad fuse or bad high speed relay. Decreased airflow causes the blower motor resistor to overheat and fail. On average, a Carrier blower motor replacement costs 0-0. Based on the driver’s input to the blower speed switch, the HVAC control head sends a digital signal to the blower motor speed control module. Restarted car after filling and the blower motor failed to work. How Often Do Brake Rotors Need to Be Replaced? A lack of airflow from your vents is a clear indicator that it may be time for a heater blower motor replacement. 15. The majority of the time, a failure will be found in the blower motor resistor or the motor. If you have a three or four speed blower motor, remove the … I shut the car off to fill with gas. Unscrew all the screws on the blower motor. Replace the resistor. 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. The blower motor resistor assembly is a common malfunction on them. Here are the blower motor fix steps: Determine if you have a manual or automatic heating system in your vehicle? Tools and materials needed: – 4-in-1 screwdriver – Nut driver. Often there are two separate circuit fuses and they can be in separate panels. This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. As an example on GM cars from the 80s and 90s there’s a 20 amp under the dash. If you start at the blower motor, and check resistance in the circuit, you will find the problem in … They often locate these parts in the heater case near the blower motor. Blower resistors can burn out. Location diagrams will also point out important parts in the climate control system such as relays, switches and fuses. They mount the resister block in the air conditioner or heater case, because of the generous amounts of air flow. Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. Be careful, on some vehicles when the engine is running the interior fan is in constant operation at a low speed. If you have a variable speed blower motor, replace the blower motor speed control module. There is no battery to operate the blower. 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. Even better an automotive meter to verify good power and grounds at the blower motor. 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. A variable speed motor is controlled by a digital speed controller. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. Variable speed blower motors don’t use a blower motor resistor. Disconnect it from the motor shaft and set aside. Ford blower motor resistor problems remain the most common solution to interior fan malfunctions on Ford cars and trucks. General Discussions. Check the blower motor at its two-wire connector for power. GM called this astro ventilation. Disconnect the electrical connector at the blower motor. Remember, you need a good ground to complete the circuit. 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. Bad bearing in blower motor. 1. 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. You can use the component location diagram in your online service manual to pinpoint the specific location of the squirrel cage (fan blades). It’s used to control the output speed of the blower motor. If you do find a burnt fuse continue to test the system and try to find out why it got toasted. There’s also a 30 amp Maxi fuse in the engine bay convenience center. See the wiring diagram below for a typical variable speed motor setup. Fixed the problem. 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). 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. With our wide variety of replacement AC heater blower motors, AutoZone can help make your ride enjoyable again - no matter what you drive. I checked all three fuse locations, the owners manual does not show a blower motor fuse, HVAC fuse is not blown. A blower motor resistor is an adjustable resistor. Check the cabin air filter for clogging. Pictured on the right is an interior fan resister assembly from a late 70s GM car or light truck. See the wiring diagram for that setup below. As more resistance is applied to the circuit the slower the interior fan motor will spin. In a situation where the motor doesn’t 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. You can learn more about this auto repair website over at the Homepage for YouFixCars.com. “The most common cause is dirt accumulation due to lack of maintenance,” said Tom Beaulieu, president of Bay Area Services Inc. in Green Bay, Wisconsin. Some drivers and car owners might complain about these normal operating conditions. Heating systems with just 3 or 4 speeds use a motor resistor along with the speed switch to regulate the motor speed. This is usually the case after a blower resistor failure on one or more speed settings. Testing the blower motor is as simple as applying battery power and Ground to the blower motor terminals. 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. Replace the blower motor. At the bottom of this page is a video that’s very popular. If you don’t see battery voltage, you’ve got a wiring or relay problem on the power supply side of the circuit. You should see battery voltage (12+). 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. Is there a breaker or relay, and where is it located. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. 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 is to prevent the circulation of ice-cold air on cold winter days when heat is selected on the climate control. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. If the blower motor doesn't work at all, the blower motor itself must be tested first. Two common reasons for this to happen would be drawing too much amperage or a problem with the resister block mentioned above. Also, check the fuse for the control side of the high speed relay. This means when you remove the part you will instantly see that it has melted spots. 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. The blower motor in your car is under the passenger side dashboard. 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. Unfortunately, you’ll 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. They always mount the interior fan near the evaporator and heater cores. Blower motor troubleshooting. Check for airflow restrictions in the duct, paying attention to debris on the evaporator or heater core. Checked for incoming resistance ground to the blower, from the dash control switch and it works. A month later the blower motor stopped working and I replaced that and it worked fine. Refer to the wiring diagram for your vehicle and check for continuity on all three resistors and speed switch setttings. The primary difference is the type of inputs to the motor control. This can be annoying, but troubleshooting is easy. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. Here are four of the most common …, Over 216 million tires were sold in the United States …, Do you love muscle cars? 1991 Ford F 150 Blower Motor Wiring Diagram. It’s 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 it’s not also something else. That’s why they’re not far from the squirrel cage itself. 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? Place them in small container. And when one or more of these resistors burn out, you’re usually left with only one blower … Remove the screws, and swap out the resistor module. Instead they use a blower motor speed control or a power transistor. The easiest way to check for a failure is to start the vehicle and turn the climate control on. TEST 1: Applying Battery Power And Ground To The Blower Motor. This is to provide an ample supply of fresh air in the interior compartment even when no climate control mode is selected. 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. Using the above troubleshooting steps will help you decide if you need to replace your air conditioner blower motor. Anything from no air circulation to annoying or noisy operation. In most cases, their diagrams are right from the factory manuals. Blower motors generally don’t fail out of the clear blue. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. A resister block will adjust its total resistance as selected by the driver from the switch. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. I also have a page focused on four GM HVAC issues on cars and trucks from the 2000s. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. However, when it comes to the interior fan I will usually go right for the fuse and check that first. They include wiring diagrams and technical service bulletins. If you have a variable speed blower motor, replace the blower motor speed control module. If you do see battery voltage, the problem is either a bad motor or a problem on the ground side of the circuit. Reduced airflow also causes the blower motor to work harder, draw more current and that can cause repeat blower motor resistor failures. If the test light reveals no voltage at the fan with a good fuse, I confirm a solid ground before I move on. Exhaust leaks can become a serious issue if they aren't taken care of early enough. Disconnect the electrical connector at the blower motor. As an Amazon Associate I earn from qualifying purchases. 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. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. It could also smell like burnt hair. The resister block used on many models is coupled with a control module. Learn how the rest of the climate control system works and discover why interior fans are an important part of the automotive AC system. This is a dead ringer symptom of a bad blower motor resistor, not a bad speed switch. 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? No prior problems. If you ignore the noise, the bearing will continue to wear to the point where the motor won’t start at all. Depending on the manufacturer and model, a blower motor resistor can go anywhere between $3 and $335 on CarParts.com . If it’s 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. Nevertheless, often when this component fails, it suffers catastrophic heat damage. The resistors are arranged in series to reduce the voltage in steps, depending on where in the series you apply power. It’s used to control the output speed of the blower motor. 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. The plug the connector back into the motor and check operation. If it doesn’t, the motor is bad. The module uses that information to pulse either power or ground to the motor. If you have a three or four speed blower motor, remove the blower motor relay. Select the department you want to search in. In most cases, they start to fail by making a high pitched squeal or screeching noise that indicates the bearing is failing. They do this for cooling purposes. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. Finding the location of the fan assembly is a good place to start diagnosis. It reviews best practices for diagnosing common electrical problems. Thread starter Buzzie8; Start date May 9, 2009; B. Buzzie8 Member. So you may have high speed, but no lower speeds. 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. However, there are a few vehicles out there that make it extremely difficult. 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. I believe General Motors first used it in the 70s. 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. You’ll have to decide on your own if this is within your skill level. Many, many times a car or truck will come into the shop with the customer complaining that their blower motor doesn’t work, or only works on high speed, etc. When I diagnose electrical problems, I start at the load and work my way back through the circuit towards the battery. Watch the example video below. Disconnect the electrical connector. 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. 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? Blower motor problems can cause many driver complaints. Locate the retainer clip in the center of the blower wheel. The control head then sends a command to the motor controller to change the speed to the driver’s preferences. If still doesn’t run, replace the motor. Purchase a new resistor module at the auto parts store (usually less than $25). 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