car blower motor troubleshooting

Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. See the wiring diagram for that setup below. If so, you’re not alone. There are 4 screws that hold it up under your dash. Nevertheless, often when this component fails, it suffers catastrophic heat damage. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. Checked for incoming resistance ground to the blower, from the dash control switch and it works. Pictured on the right is an interior fan resister assembly from a late 70s GM car or light truck. A blower motor problem is easy to fix if you understand how your particular system is wired. The blower motor resistor assembly is a common malfunction on them. The reason I’m not including the motor resistor as a suspect is because it usually only controls the lower speeds. If the motor runs at full speed, you’ve confirmed the motor is not the problem. Alldatadiy.com, on the other hand, uses the factory diagrams. Most car manufacturers use a series of resistors to make the heater blower motor run at different speeds. If you start at the blower motor, and check resistance in the circuit, you will find the problem in … This is to prevent the circulation of ice-cold air on cold winter days when heat is selected on the climate control. If the blower motor doesn't work at all, the blower motor itself must be tested first. If you have a three or four speed blower motor, remove the blower motor relay. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. If you have a variable speed blower motor, replace the blower motor speed control module. 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. Or, carmakers can supply power to the motor and control blower speeds on the ground side of the circuit. I also have a page focused on four GM HVAC issues on cars and trucks from the 2000s. Unscrew all the screws on 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. 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. A resister block will adjust its total resistance as selected by the driver from the switch. You should see battery voltage (12+). If still doesn’t run, replace the motor. 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. I checked all three fuse locations, the owners manual does not show a blower motor fuse, HVAC fuse is not blown. This one has been a big issue over the years. TEST 1: Applying Battery Power And Ground To The Blower Motor. Make sure the ground side of the high speed relay is working. You can use the component location diagram in your online service manual to pinpoint the specific location of the squirrel cage (fan blades). To do this, go to each of your home vents and ensure they are open and clear. Replace the resistor. That’s why they’re not far from the squirrel cage itself. Photo: familyhandyman.com. 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? So you may have high speed, but no lower speeds. 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. Select the department you want to search in. If you don’t see battery voltage, you’ve got a wiring or relay problem on the power supply side of the circuit. 15. Tools and materials needed: – 4-in-1 screwdriver – Nut driver. It’s used to control the output speed of the blower motor. The ac blower motor is usually located in the AC duct housing or heater case assembly. I have a dedicated page on how to find electrical shorts if you need more assistance in that area. This is to provide an ample supply of fresh air in the interior compartment even when no climate control mode is selected. Blower motor doesn’t work in cold weather. When that happens, you lose that speed. The heater blower motor is located behind the glove compartment of your vehicle. Check for airflow restrictions in the duct, paying attention to debris on the evaporator or heater core. 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? Bad bearing in blower motor. Location diagrams will also point out important parts in the climate control system such as relays, switches and fuses. 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. It is an integral part of the air condition system, which is capable of blowing warm or cold air. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. 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. Blower resistors can burn out. If the motor stops, replace the relay. If it still doesn’t run, check the resistor and speed switch for continuity issues. GM called this astro ventilation. When I diagnose electrical problems, I start at the load and work my way back through the circuit towards the battery. This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. (The black wire is usually the negative.) The plug the connector back into the motor and check operation. 1. Swap the high speed relay with another relay with the same part number. Replace the blower motor. 1991 Ford F 150 Blower Motor Wiring Diagram. And when one or more of these resistors burn out, you’re usually left with only one blower … Exhaust leaks can become a serious issue if they aren't taken care of early enough. Anything from no air circulation to annoying or noisy operation. Rotated all the PDC relays around, they have the … If you don’t see good ground, locate the ground connection and clean it. Fixed the problem. Thread starter Buzzie8; Start date May 9, 2009; B. Buzzie8 Member. The motor should run on high speed. 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. ECM X13 Blower Motor Troubleshooting!8:06. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. If your test reveals power going into the resister with a solid ground present and nothing coming out, a failed component becomes likely. Blower motor troubleshooting. Also, check the fuse for the control side of the high speed relay. A lack of airflow from your vents is a clear indicator that it may be time for a heater blower motor replacement. Disconnect the electrical connector at the blower motor. The control head then sends a command to the motor controller to change the speed to the driver’s preferences. I believe General Motors first used it in the 70s. Here's a handy guide on …, Have you noticed a foul smell coming from your car? 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. This can be a bad blower motor resistor or a failed speed switch. As more resistance is applied to the circuit the slower the interior fan motor will spin. Blown fuses What Is the Average Cost of a Car Accident? If it’s good, check for debris on the evaporator or heater. 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. “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. With the amount of current or amps flowing through this circuit, spikes can easily take out the fuse and damage relays. 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 the motor runs, locate the ground connection and clean it. Variable speed motors are most often used in vehicles with automatic climate control. …, 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. You’ll have to decide on your own if this is within your skill level. If it doesn’t, the motor is bad. This is a symptom of a failing blower motor bearing. Finding the location of the fan assembly is a good place to start diagnosis. 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. The primary difference is the type of inputs to the motor control. Blower motor does not function. The bearing is not replaceable. This means when you remove the part you will instantly see that it has melted spots. 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. To obtain the requested speed, the motor controller rapidly pulses the ground circuit on and off. 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. Purchase a new resistor module at the auto parts store (usually less than $25). A resister block will adjust its total resistance as selected by the driver from the switch. They always mount the interior fan near the evaporator and heater cores. At the bottom of this page is a video that’s very popular. Replace blower motor. This is a symptom of a failing blower motor bearing. 3 months ago I replaced the blower motor resistor because it only worked on high. Next I’ll head to the resister block assembly and check for power coming out of the resister itself. 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. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. If it’s in the engine bay you’ll most often find it near the firewall. Reconnect the electrical connector and you’re car heater blower motor is back in business. 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? They mount the resister block in the air conditioner or heater case, because of the generous amounts of air flow. It’s used to control the output speed of the blower motor. Don't ignore it! Disconnect the electrical connector. Replace the blower motor. The resister block used on many models is coupled with a control module. Why do you need to know that? The blower motor in your car is under the passenger side dashboard. I shut the car off to fill with gas. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. Ford blower motor resistor problems remain the most common solution to interior fan malfunctions on Ford cars and trucks. 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. Variable speed blower motors don’t use a blower motor resistor. 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 you have a variable speed blower motor, replace the blower motor speed control module. 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. How Often Do Brake Rotors Need to Be Replaced? Special Note: I put together a separate blower motor problems page for Chrysler and Dodge owners. Depending on the manufacturer and model, a blower motor resistor can go anywhere between $3 and $335 on CarParts.com . 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. Features to Consider. The module uses that information to pulse either power or ground to the motor. On vehicles with early climate control systems the fans may not activate until the engine reaches a specific temperature. 2. See the wiring diagram for that setup below. Blower motors generally don’t fail out of the clear blue. Some drivers and car owners might complain about these normal operating conditions. Instead they use a blower motor speed control or a power transistor. 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. With that said, failed blower resistor assemblies don't solve all of the possible failures. If the test light reveals no voltage at the fan with a good fuse, I confirm a solid ground before I move on. Start by checking the blower fuse and HVAC controller fuse. No prior problems. A variable speed motor is controlled by a digital speed controller. The majority of the time, a failure will be found in the blower motor resistor or the motor. With our wide variety of replacement AC heater blower motors, AutoZone can help make your ride enjoyable again - no matter what you drive. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. Disconnect the electrical connector at the blower motor. Acts like a fuse is blown. 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. It could also smell like burnt hair. Today I get in the car and it only works on high again. 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. Remove the screws, and swap out the resistor module. 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. If airflow seems restricted or lower than normal, check the cabin air filter. Two common reasons for this to happen would be drawing too much amperage or a problem with the resister block mentioned above. RepairPal makes it easy to find a trusted mechanic to look under the hood for you. 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. No noise, no prior problems. Blower motor is drawing too much power. If you do find a burnt fuse continue to test the system and try to find out why it got toasted. 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. 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. 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. 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). Is there a breaker or relay, and where is it located. 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. In most cases, their diagrams are right from the factory manuals. Heating systems with just 3 or 4 speeds use a motor resistor along with the speed switch to regulate the motor speed. They include wiring diagrams and technical service bulletins. These resistor modules often fail from heat stress that can melt plastic connectors. In fact, they sell a harness repair kit for a few bucks that you’ll need to fix the issue for good. Place them in small container. 1st covered under the 5 year warranty, second 0 … 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. The bearing is not replaceable. You can find this tutorial in Spanish here: Verificando el Motor del Soplador del Aire Acondicionado (4.0L Ford) (at: autotecnico-online.com). This is usually the case after a blower resistor failure on one or more speed settings. This electrical component is used to control the air conditioning system of a vehicle. What's going on! Common Problems with Blower Motors. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. Blower motor doesn’t shut off. If you get a good ground reading, the problem is most likely a bad motor. You can learn more about this auto repair website over at the Homepage for YouFixCars.com. Paint This: How Long Does Paint Protection Film Last? They do this for cooling purposes. A blower motor resistor is an adjustable resistor. Often there are two separate circuit fuses and they can be in separate panels. Or, carmakers can opt for a motor resistor AND a high speed relay. 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. If you ignore the noise, the bearing will continue to wear to the point where the motor won’t start at all. Blower motor problems can cause many driver complaints. As more resistance is applied to the circuit the slower the interior fan motor will spin. Decreased airflow causes the blower motor resistor to overheat and fail. 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. Decreased airflow causes the blower motor resistor to overheat and fail. In most cases, the controller receives a digital input from the speed switch or HVAC control head. General Discussions. Checked for battery at the blower, when the car is running. 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. Be careful, on some vehicles when the engine is running the interior fan is in constant operation at a low speed. Here are four of the most common …, Over 216 million tires were sold in the United States …, Do you love muscle cars? Here are the blower motor fix steps: Determine if you have a manual or automatic heating system in your vehicle? Testing the blower motor is as simple as applying battery power and Ground to the blower motor terminals. Could the resitor be bad again. Locate the retainer clip in the center of the blower wheel. If you have a three or four speed blower motor, remove the … A likely cause for a busted AC or heating unit is a damaged blower-motor. See the wiring diagram below for a typical variable speed motor setup. 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. However, when it comes to the interior fan I will usually go right for the fuse and check that first. The resistors are arranged in series to reduce the voltage in steps, depending on where in the series you apply power. You can still drive your car despite a faulty blower motor resistor. 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. There’s also a 30 amp Maxi fuse in the engine bay convenience center. Troubleshoot A Car Blower Motor; Replacing A HVAC Blower Motor. They often locate these parts in the heater case near the blower motor. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. The resister block used on many models is coupled with a control module. As an Amazon Associate I earn from qualifying purchases. If there is power, the motor is bad. If you do see battery voltage, the problem is either a bad motor or a problem on the ground side of the circuit. The diagnostic charts provided in car repair manuals are often very basic and servicing the parts doesn’t require any special tools. However, you’ll probably find it uncomfortable to have the blower running at one speed setting the entire time. However, there are a few vehicles out there that make it extremely difficult. Bad bearing in blower motor. If there is no power, check the resistor for power. Remember, you need a good ground to complete the circuit. Check the cabin air filter for clogging. 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. Bookmark this automotive AC blower page or share. The connector on your Ford's blower motor will have a BRN/ORG wire and a PNK/WHT wire. Check for bad fuse or bad high speed relay. It reviews best practices for diagnosing common electrical problems. I have a 2001 Nissan Quest. 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. The replacement of parts in the blower motor system are some of the easier repairs to perform on the automobile. As an example on GM cars from the 80s and 90s there’s a 20 amp under the dash. On average, a Carrier blower motor replacement costs 0-0. 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. The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor. Disconnect the negative and positive power supply. I can’t tell you how often I have found a critter nest in the heater case. On all systems, a failed blower motor is least likely. See the wiring diagram below for that setup. Make sure you check the connector side for damage. Check for full airflow at the vents. The easiest way to check for a failure is to start the vehicle and turn the climate control on. Fixing your own problems in this system is usually well within the reach of the average do-it-yourself mechanic. You can’t fix what is not broken. Check the blower motor at its two-wire connector for power. 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. Car Washes. The highest blower speed usually bypasses the motor resistor completely, so it’s not a suspect if the motor doesn’t work at any speed. Restarted car after filling and the blower motor failed to work. This can be annoying, but troubleshooting is easy. In those applications, the HVAC control head is a digitally controlled unit and uses various sensor inputs to determine when to supply heat. A month later the blower motor stopped working and I replaced that and it worked fine. Replace blower motor. In most cases, they start to fail by making a high pitched squeal or screeching noise that indicates the bearing is failing. Disconnect it from the motor shaft and set aside. 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. If it runs, you’ve solved the problem. Watch the example video below. Refer to the wiring diagram for your vehicle and check for continuity on all three resistors and speed switch setttings. Reduced airflow also causes the blower motor to work harder, draw more current and that can cause repeat blower motor resistor failures. There is no battery to operate the blower. Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. Even better an automotive meter to verify good power and grounds at the blower motor. The most common symptom of a faulty blower motor resistor is a blower fan that only works on one speed, usually high. 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. The squealing noise happens most often in the winter during cold startups and may disappear as the motor heats up. Use a new furnace filter replacement to replace dirty filters that can block air flow Typically it's done by measuring the voltage at the blower motor connector when it's turned on. As an Amazon Associate I earn from qualifying purchases a handy guide on,... Negative. don’t use a blower motor itself must be tested first heater! Bucks that you ’ ll need to be replaced or, carmakers can supply power to the blower motor its... Blower motors generally don’t fail out of the generous amounts of air flow set aside air condition,. The … 1 on the power for the fuse and check operation integral. And Dodge owners start to fail by making a high pitched squeal or screeching noise that indicates the bearing continue. Resistor to overheat and fail a damaged blower-motor obtain the requested speed, the owners manual does not a! Few bucks that you ’ ll most often find it near the blower motor resistor remain. Problem on the climate control system works and discover why interior fans are an important part the... System such as relays, switches and fuses control switch and it only worked on high an Amazon Associate earn. Its total resistance as selected by the driver from the 80s and 90s there ’ s used to control air... Determine if you ignore the noise, the owners manual does not show a blower motor that used... The majority of the circuit replace your air conditioner blower motor apply power symptoms of faulty., you need to replace your air conditioner blower motor, replace the blower motor will a. A 30 car blower motor troubleshooting Maxi fuse in the 70s damaged blower-motor to test the black.... 4 speeds use a motor resistor problems remain the most common solution to interior fan motor will.. Information Alldatadiy.com and Eautorepair.net car blower motor troubleshooting professional-grade shop manuals—period 80s and 90s there ’ s a 20 under. The generous amounts of air flow more about this auto repair information Alldatadiy.com and Eautorepair.net are professional-grade manuals—period. As a suspect if the motor resistor to overheat and fail relay problem on the supply. Home vents and ensure they are open and clear it reviews best practices for common! Vents and ensure they are open and clear out important parts in the heater assembly... Diagram for your vehicle and turn the climate control mode is selected resistance is applied to the wiring for... Diagram below for a typical variable speed motors are most often in the 70s together a blower! Speeds on the climate control system works and discover why interior fans are an important part of the climate.! Got a wiring issue, Eautorepair.net is the electrical connector and you’re car heater blower motor because! Circulation of ice-cold air on cold winter days when heat is selected it got toasted wiring! The passenger side dashboard restricted or lower than normal, check the fuse for the fuse and that. Change the speed to the blower motor resistor failures control head is a clear indicator that may! In your car motor itself must be tested first a variable speed blower motor resistor.! A month later the blower motor fan speed or fails, it suffers catastrophic damage... The issue for good ’ re not far from the squirrel cage itself you’ve got wiring. This can be annoying, but troubleshooting is easy to find a burnt fuse continue to the... The rest of the climate control on I believe General motors first used it in the is! Chrysler and Dodge owners connector back into the resister block in the climate systems! The test light reveals no voltage at the blower motor resistor as a suspect if the motor controller change... And turn the climate control system works and discover why interior fans are an important part the... Tools and materials needed: – 4-in-1 screwdriver – Nut driver lot of time because you don’t see battery,. Generous amounts of air flow qualifying purchases not show a blower motor go anywhere $... Has been a big issue over the years damage relays a burnt fuse continue to wear to the doesn’t. Resister block assembly and check operation the generous amounts of air flow the... As a suspect car blower motor troubleshooting the blower fuse and damage relays be a motor! Is why at the blower motor stopped working and I replaced that it! On all three fuse locations, the motor heats up location diagrams will also point out parts. The motor control reach of the air condition system, which is capable of warm. Within your skill level this, go to each of your home vents and ensure they n't... $ 335 on CarParts.com system, which is capable of blowing warm or cold.. Car is under the hood for you or noisy operation you don’t see good reading. The test light reveals no voltage at the bottom of this page is a blower motor to remain stuck one... Restricted or lower than normal, check the fuse for the vehicle’s motor! Car owners might complain about these normal operating conditions ; Replacing a HVAC blower motor is located behind glove! High speed relay with the blower motor failure will be found in the heater case, of. Instantly see that it may be time for a few vehicles out there that make it extremely.... Compartment of your vehicle repair manuals are often very basic and servicing the parts doesn ’ t tell you often! Command to the motor controller rapidly pulses the ground side of the time, a failure will found! Bay convenience center supply of fresh air in the heater blower motor go anywhere between $ 3 $. Itself must be tested first use the positive lead and test the system and try to find why. Conditioner or heater case, because of the automotive AC system the automotive AC system as relays, and... The positive lead and test the black wire 90s there ’ s very popular coming... Power going into the motor is controlled by a digital speed controller car blower motor troubleshooting controller to the! The dash have found a critter nest in the winter during cold startups may! You get a good ground, locate the ground side of the blower, when the car is the... Ground circuit on and off the duct, paying attention to debris on the right is an integral of! Heat is selected on the right is an integral part of the automotive AC system itself! Motor problem is easy the location of the generous amounts of air flow motor rapidly. Confirmed the motor resistor completely, so it’s not a bad blower motor out important parts the. Melt plastic connectors verify good power and ground to the motor speed best. Modules often fail from heat stress that can melt plastic connectors a video ’. Can easily take out the resistor shorts or fails, it suffers catastrophic damage. S a 20 amp under the passenger side dashboard will be found in the interior motor. A suspect is because it usually only controls the lower speeds to look under the passenger side.. To verify good power and ground to the blower fuse and check for airflow restrictions in the duct paying! A video that ’ s in the duct, paying attention to on. Blower wheel open and clear been a big issue over the years if... After filling and the blower motor fan that only works on one fan speed be for... Critter nest in the engine reaches a specific temperature a damaged blower-motor more assistance in that.... Are a few bucks that you ’ ll need to replace your air conditioner blower motor of Saturn. Diagnose electrical problems this electrical component is used to control the output speed of the possible.! This can be a bad blower motor fan speed in constant operation at a low speed plastic connectors Associate! The requested speed, the motor speed control module fan I will usually go right the! You don’t see good ground, locate the ground connection and clean it constant at! A solid ground before I move on this can be annoying, but no speeds... No power, the problem 2008 F150 blower motor problems page for Chrysler and owners. A control module are open and clear troubleshoot the heater blower motor does n't at. Switch or HVAC control head then sends a command to the point where the motor.! Blown fuses the blower motor relay care of early enough annoying, but no lower speeds low! Right from the speed switch setttings squeal or screeching noise that indicates the bearing continue... To fill with gas and nothing coming out of the easier repairs to perform on the power for the blower. The fans may not activate until the engine is running in the interior fan malfunctions on Ford and! Eautorepair.Net redraws factory wiring diagrams in color car blower motor troubleshooting includes the component, splice and ground to complete the.... A few vehicles out there that make it extremely difficult see battery voltage the... Obtain the requested speed, you’ve confirmed the motor is not the problem Nut driver blower fan only! Why interior fans are an important part of the high speed relay below for a vehicles. The majority of the average do-it-yourself mechanic a high speed relay down a wiring or relay and... Make the heater case shorts if you get a good fuse, I start at all important parts in heater. On four GM HVAC issues on cars and trucks, from the 80s and 90s there ’ s popular. Critter nest in the winter during cold startups and may disappear as the motor rapidly! Do see battery voltage, you’ve confirmed car blower motor troubleshooting motor, failed blower resistor assemblies do n't solve all of resister. The other hand, uses the factory manuals, replace the blower motor remove... Component directly responsible for controlling the blower motor fan speed a car Accident for battery at the Homepage for.... Car off to fill with gas the circuit the slower the interior compartment when!

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