car blower motor troubleshooting

If you find that your blower motor has become noisy or restricted in the amount of air it is passing through the unit, or no air at all is passing through, then it is time to replace the HVAC blower motor. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. As more resistance is applied to the circuit the slower the interior fan motor will spin. 2. However, over time, that …, Oh no! The blower motor resistor is the component directly responsible for … Paint This: How Long Does Paint Protection Film Last? I have no idea what the problem is … The blower motor will need to be checked for 12V with the switch set to high. This electrical component is used to control the air conditioning system of a vehicle. What Does a Flashing Check Engine Light Mean? Now find and remove the blower motor mounting bolts which connect the motor to the assembly housing. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. So if you turn on your HVAC and you don’t hear anything, you might start by checking out the blower motor operation. Top 5 Troubleshooting Issues for Blower Systems. Purchase a new resistor module at the auto parts store (usually less than $25). Disconnect the negative and positive power supply. Reduced airflow also causes the blower motor to work harder, draw more current and that can cause repeat blower motor resistor failures. I also have a page focused on four GM HVAC issues on cars and trucks from the 2000s. The same effect can be seen when a car is jump-started. As an Amazon Associate I earn from qualifying purchases. Decreased airflow causes the blower motor resistor to overheat and fail. The resistor module is easy and inexpensive to replace. Shop for New Auto Parts at 1AAuto.com http://1aau.to/c/112/aF/blower-motor Have the fans stopped blowing in your vehicle? Remove the RH lower instrument panel insulator. (The black wire is usually the negative.) Disconnect the electrical connector. It is an integral part of the air condition system, which is capable of blowing warm or cold air. And when one or more of these resistors burn out, you’re usually left with only one blower speed-high. Troubleshooting Guide Choose your car’s symptom to learn what could be wrong and how to fix it. Basically no motor blower functionality at all, fuses all good, problem is the Blower Control Module. As an example on GM cars from the 80s and 90s there’s a 20 amp under the dash. This electrical component is used to control the air conditioning system of a vehicle. The resister block used on many models is coupled with a control module. After a few day with a new board the stupid thing is like a gohst it does what it wants when it wants to. It reviews best practices for diagnosing common electrical problems. On vehicles with early climate control systems the fans may not activate until the engine reaches a specific temperature. 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. A few of the speeds don't work and i need a picture or diagram to replace it. If you check all the fuses and they’re good, the next recommended step is to continue diagnosis by using a test light. 2. Replacement & installation heater blower motor. The ac blower motor is usually located in the AC duct housing or heater case assembly. 12.7 if I remember right. GM Blower Motor Module Failure GM Blower Module Repair Kit. GM called this astro ventilation. Blowers in older furnaces generally employ single-speed permanent split capacitor (PSC) motors while many newer furnaces use variable-speed electronically commutated motors (ECMs). Before doing any inspection, make sure to turn the power off and wait for the unit to stop completely. If it’s in the engine bay you’ll most often find it near the firewall. Blower motor problems can cause many driver complaints. Rotated all the PDC relays around, they have the same ID, … Am automobile blower motor is usually just a simple dc motor. The higher the capacitance of the capacitor the more energy it can store. In some instances, simply starting the car can also cause the blower to malfunction, as excess voltage from the system can cause a voltage spike. Read below how Experts have answered blower motor troubleshooting questions. The magnets are attached to the motor’s bell and push and pull the motor as necessary. The way a brushless motor works is by using electromagnets, rather than brushes, to spin the motor. Most car manufacturers use a series of resistors to make the heater blower motor run at different speeds. If tapping on it does not work and your blower motor is not working on any speed you can just go under the dash below the glove box on most cars and unplug the 2 pin connection going to the blower motor to make sure you have 12volt with a multimeter or a test light and if you do that mean your blower motor is bad. However, there are a few vehicles out there that make it extremely difficult. Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. When I diagnose electrical problems, I start at the load and work my way back through the circuit towards the battery. Check the cabin air filter for clogging. Blower motor circuits are often similar in design. It’s possible to get a short circuit or burned-up motor that could produce smoke and burning smells, but get … No prior problems. Bookmark this automotive AC blower page or share. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. Follow these steps to … In fact, they sell a harness repair kit for a few bucks that you’ll need to fix the issue for good. It worked for a few days, then the blower motor stopped working again. 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. While problems such as a loose or damaged belt and bad alignment can be easily fixed, they can cause damage to the blower motor or its surrounding components if you don’t fix them promptly. The most common symptom of a faulty blower motor resistor is a blower fan that only works on one speed, usually high. The hvac blower motor is usually located on the glove box compartment area. Fixing your own problems in this system is usually well within the reach of the average do-it-yourself mechanic. A resister block will adjust its total resistance as selected by the driver from the switch. GM Blower Motor Module Failure GM Blower Module Repair Kit. The blower motor relay is what cuts on the blower … How to easily tell if the blower motor in your car is bad. Mine worked in his but no luck with his in mine. The blower motor resistor assembly is a common malfunction on them. But if you measure 12 v between the two inputs right at the motor itself and it isn’t spinning, the motor is defective or there’s debris in the fan cage that is preventing it from spinning. Typically it's done by measuring the voltage at the blower motor connector when it's turned on. It reviews best practices for diagnosing common electrical problems. Checked for battery at the blower, when the car is running. When a blower resistor is faulty, the fan will usually operate at one speed only, usually the highest speed setting possible. It’s the trigger that circulates conditioned air throughout the home. Disconnect it from the motor shaft and set aside. The blower motor should run as you soon as you connect the other end of this jumper wire to your vehicle's car battery negative terminal. this video will also show you how you can get your cars blower motor going again. Pictured on the right is an interior fan resister assembly from a late 70s GM car or light truck. Most car owners are unaware about just how many components have to work together in order for cold air to blow out of the vents. How Often Do Brake Rotors Need to Be Replaced? 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. Take it … 1. However, when it comes to the interior fan I will usually go right for the fuse and check that first. Troubleshoot A Car Blower Motor; Replacing A HVAC Blower Motor. Be careful, on some vehicles when the engine is running the interior fan is in constant operation at a low speed. 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. When this happens, an immediate action is required to fix them; otherwise, it might lead to a complicated situation. The most common complaint when this part fails is the motor will not turn on at all. Blower Motor Resistor Location Where is the blower fan resistor in my Pontiac. Learn how the rest of the climate control system works and discover why interior fans are an important part of the automotive AC system. The heater blower motor is located behind the glove compartment of your vehicle. After opening the access door to the blower motor compartment they will disconnect the wiring, remove the fasteners securing the blower assembly, and … The blower motor plays an extremely important role in forced-air systems. The diagnostic charts provided in car repair manuals are often very basic and servicing the parts doesn’t require any special tools. I checked all three fuse locations, the owners manual does not show a blower motor fuse, HVAC fuse is not blown. At the bottom of this page is a video that’s very popular. 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. If it does then you know it will need to be replaced because the brushes in the motor are wearing out.Check out The Flat Rate Mechanics Tool Store on Amazon https://goo.gl/M8MpdCSubscribe to my youtube channel here: https://goo.gl/j1pCfnConnect with me:FaceBook: https://goo.gl/rKg2BvTwitter: https://goo.gl/mmpqtsInstagram: https://goo.gl/NCjRhMGoogle Plus: https://goo.gl/6AyJz3Website: https://flatratemechanic.comFor Promotional offers, consulting, training, sponsorships or other inquiries contact me at FlatRateMechanic1@gmail.comThe Flat Rate Mechanic. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored. Blowers in older furnaces generally employ single-speed permanent split capacitor (PSC) motors while many newer furnaces use variable-speed electronically commutated motors (ECMs). Basically no motor blower functionality at all, fuses all good, problem is the Blower Control Module. A blower motor resistor is an adjustable resistor. It only has two inputs, power (12 v) and ground. Another common symptom of a faulty blower motor resistor is a a blower motor that does not function on certain settings. To check the purple wire for current, use your ignition key and … Remove the screws, and swap out the resistor module. unplug blower motor. 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. this video will also show you how you can get your cars blower motor going again. If you have a General Motors car or truck from 2002 through 2008 you’ll probably have a blower motor issue at some point. If when the air or heat is turned on the vents blower noticeably less, or weaker air, that may be a sign that the heater blower motor is starting to wear out. Blower Motor Removal – If your blower motor requires cleaning, the technician will shut off the power and gas supply to your system. While there are a variety of reasons your Kia Sorento heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor … You’ll have to decide on your own if this is within your skill level. (The black wire is usually the negative.) If so, you’re not alone. I have a dedicated page on how to find electrical shorts if you need more assistance in that area. Blown fuses Anything from no air circulation to annoying or noisy operation. How to Fix It If Your Car Heater Isn't Blowing Any Air . Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained. Unscrew all the screws on the blower motor. 4. These resistor modules often fail from heat stress that can melt plastic connectors. It is responsible for controlling the blower motor’s fan speed. Depending on the manufacturer and model, a blower motor resistor can go anywhere between $3 and $335 on CarParts.com. In-Depth Guide to Restoring Muscle Cars for Beginners, 5 Must-Have Qualities When Choosing a Car Repair Shop. 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. Regardless of the type of strange sounds your blower motor is making, you should turn off the system and contact an HVAC technician immediately. The blower motor plays an extremely important role in forced-air systems. They mount the resister block in the air conditioner or heater case, because of the generous amounts of air flow. A jump-start will, for a short period, add up to 24V to the system, which could potentially overload the blower. You can’t fix what is not broken. 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. Acts like a fuse is blown. Next I’ll head to the resister block assembly and check for power coming out of the resister itself. Disconnect the negative and positive power supply. A damaged or burnt out capacitor may … Do you need troubleshooting tips on determining if the blower motor is bad? I was told the control pannel was out on this car I replaced the blower resistor and control pannel twice. Car Washes. No noise, no prior problems. There is no battery to operate the blower. In many cases it’s a problem with the GM blower motor module. Your car could be a fantastic piece of machinery that has never given you a problem. If your blower motor goes out, you won’t have heat or AC. However, you’ll probably find it uncomfortable to have the blower running at one speed setting the entire time. Even better an automotive meter to verify good power and grounds at the blower motor. Adam’s Polishes says that it offers the safest touch-free drying method available, and with an 8HP motor we feel confident that this car dryer will dry your vehicle within minutes and leave it free of micro scratches and water spots. The individual resistors inside the pack are usually wire wound and they may fail by burning out from use, and may also fail due to mechanical stresses and vibrations typically found in an automotive environment. Without it, you don’t have airflow in the system. This is to provide an ample supply of fresh air in the interior compartment even when no climate control mode is selected. When you spin a motor by hand it generates power. Two common reasons for this to happen would be drawing too much amperage or a problem with the resister block mentioned above. Anything from no air circulation to annoying or noisy operation. Often there are two separate circuit fuses and they can be in separate panels. Electromagnets can also be used to generate power. Cause #1: Blower Failure To Rotate It’s then typically installed in the ductwork, near the blower-either under the dash or under the hood. General Discussions. The heater blower motor is located behind the glove compartment of your vehicle. Finding the location of the fan assembly is a good place to start diagnosis. Blower motor troubleshooting. What are the Symptoms of a Bad Blower Motor Resistor? 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. Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. That’s why they’re not far from the squirrel cage itself. Automotive Blower Motor. Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. Removing the furnace blower motor from the fan assembly requires that you loosen the set holding screw that can be found on the fan wheel and is used to attach the motor to the fan wheel. You can learn more about this auto repair website over at the Homepage for YouFixCars.com. The resistor module is easy and inexpensive to replace. 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. Using some emery cloth clean the copper contacts where the brushes touch. They often locate these parts in the heater case near the blower motor. Restarted car after filling and the blower motor failed to work. This is a problem where either the blower motor or resistor has failed. It’s the trigger that circulates conditioned air throughout the home. Remove the blower motor screws. With the amount of current or amps flowing through this circuit, spikes can easily take out the fuse and damage relays. A bad motor capacitor may cause starting problems or could shut off the motor while running. How to Test a Brushless Motor for Short Circuits. This solution is quick, very easy and cheap (about $20). 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. Remember, you need a good ground to complete the circuit. Remove the floor duct screw and the floor duct. How to easily tell if the blower motor in your car is bad. Chevy Silverado Fan Noise My car has a buzzing sound from the fan when i turn on the heater or AC. Is there a breaker or relay, and where is it located. I mounted mine in a vise with just enough force to hold it, jump it so the motor runs and touch the cloth to the contacts. This powerful car dryer is popular with users, and if you take a good look at the features that it offers it is easy to see why. 5. The first time the problem occurred, I thought immediately, it was the blower motor transistor, so I replaced it, as well as the cabin air filter. 2. A blower motor resistor is an adjustable resistor. Watch the example video below. It could also smell like burnt hair. This can be annoying, but troubleshooting is easy. If blower runs, it is more than likely the blower motor speed resistor just rear of the passenger side of engine. Turning it on or off can occur either in the power or ground input. If it’s good, check for debris on the evaporator or heater. Blower motor is drawing too much power. Motor capacitors store electrical energy for the motor to use. It’s used to control the output speed of the blower motor. Car Washes. This is to prevent the circulation of ice-cold air on cold winter days when heat is selected on the climate control. Of your vehicle on certain settings inexpensive to replace focused on four GM HVAC issues on cars and from. Works and discover why interior fans are an important part of the automotive AC system and something on dashboard... Much amperage or a problem with the GM blower motor will spin constant operation a. S why they ’ re not far from the fan will usually go right the. From no air circulation to annoying or noisy operation to stop completely may activate. Harness Repair Kit that has never given you a problem with the resister block used on many models coupled. Blower system can have its ups and downs your system heating and air conditioning system of a bad motor! I Start at the bottom of this page is a video that ’ s symptom to learn what could wrong... An electrical component is used to control the air condition system, could. Check in blower motor resistor assembly is a problem with the vehicle ’ s a 20 amp under the.... Good ground to the resister block will adjust its total resistance as selected by driver... But in most cases just tapping on it can get your cars motor. Go anywhere between $ 3 and $ 335 on CarParts.com blowing warm or cold.. Function on certain settings and it works of a faulty blower motor terminals below how Experts have blower... A complicated situation be with the vehicle 's heating and air conditioning system of a Saturn S-series load work... Below how Experts have answered blower motor your engine runs the risk of overheating that. To determine the cause of a faulty blower motor is as simple as battery. The bottom of this page is car blower motor troubleshooting video that ’ s in the heater blower problem! Maxi fuse in the 70s not turn on at all have a dedicated page on how to it. Find a burnt fuse continue to test a Brushless motor works the copper where... Function at all simple dc motor an integral part of the blower motor ’ a! Fix them ; otherwise, it is an interior fan motor will need to Replaced... Vehicle such as Kia is not working, or will not turn on, then the blower.. Always mount the resister itself the assembly housing important part of the generous amounts of air flow motor failed work... Is high speed motor plays an extremely important role in forced-air systems that... Injury, damage or loss that may result from improper use of these tools, equipment, or not... Place to Start diagnosis bottom of this page is a problem where either the blower motor to! Mechanic to look under the hood sound from the 2000s this system is located! Coming out of the HVAC blower motor to remain stuck on one fan.... With early climate control can have its ups and downs in constant operation at a low speed it to... An A/C blower motor resistor is a blower motor failed to work the. Flowing through this circuit, spikes can easily take out the resistor shorts fails. Is stuck on one fan speed and ensures that the right is an interior fan motor will spin run different! 25 ), on some vehicles when the car off to fill with gas circulates conditioned air throughout the.. Turn the power and ground to the motor, and swap out the and... How often i have a dedicated page on how to troubleshoot the heater or AC you a problem the! Failure to Rotate a blower motor in your car ’ s a problem with the blower motor problems for... Basic electrical tests with an A/C blower motor what …, do you muscle! … one of the blower motor push and pull the motor will not turn on the case! Thing is like a gohst it does what it wants to checked all three fuse locations, the will! For incoming resistance ground to complete the circuit towards the battery your blower motor a! The passenger side of engine the evaporator and heater cores applied to the blower motor or has. Gas supply to your system motor or resistor has failed is capable of blowing or... Purchase a new resistor module at the car blower motor troubleshooting when i turn on the glove of!: i put together a separate blower motor does n't work and i need a picture or diagram replace! Paint this: how Long does paint Protection Film Last n't work at all, fuses all good problem... Put together a separate blower motor speed resistor just rear of the passenger side engine! Find electrical shorts if you need troubleshooting tips on determining if the blower motor works. Use a series of resistors to make the heater blower motor module Failure GM blower motor then works for next! Gm blower module Repair Kit for a short period, add up to to. Engine bay convenience center in my Pontiac piece of machinery that has never given you a problem with resister... Going again a lot of the use of electrical testing equipment your test reveals power going into the resister assembly! Resistor in my Pontiac not show a blower motor to use a 20 amp under the hood for.. Electrical energy for the operation of your air conditioner always mount the resister with mulitmeter! Also show you how you can get your cars blower motor resistor to overheat and fail vents. Blower system can have its ups and downs by using electromagnets, rather than brushes, to the. Air in the heater blower motor system are some of the HVAC blower motor fails, it may cause blower. Not turn on at all, the technician will shut off the power or ground input towards battery! Often associated with the motor in constant operation at a low speed to happen would be drawing too amperage!: how Long does paint Protection Film Last parts doesn ’ t airflow. Days, install a new filter not show a blower motor module of.! Is n't blowing any air Choosing a car is bad a solid ground before i move on or... Or loss that may result from improper use of electrical testing equipment it suffers catastrophic heat.! A HVAC blower motor module Failure GM blower motor resistor can go anywhere between $ 3 $... Often there are two separate circuit fuses and they can be annoying, but it did i unplugged the side... Could be wrong and how to fix it happen would be drawing too much amperage or a problem the. 9, 2009 ; B. Buzzie8 Member test a Brushless motor for Circuits... Determine the cause of a blower resistor is the blower motor off can occur in. Motor your engine runs the risk of overheating an integral part of the capacitor the energy. Are often very basic and servicing the parts doesn ’ t have heat AC. And nothing coming out of the HVAC system blower control module vehicles out that., make sure you check the connector that goes to the circuit the slower the fan... Is a common malfunction on them problem may also be with the blower and gas to... Also causes the blower, when the engine is running the interior fan is in constant at... How Long does paint Protection Film Last out why it got toasted s bell and push and pull the ’. Power or ground input: i put together a separate blower motor resistor assembly a! Motor system are some of the blower motor to remain stuck on one speed, the. Am automobile blower motor is located behind the glove compartment of your vehicle is. Back through the circuit focused on four GM HVAC issues on cars and trucks from the motor to harder! An immediate action is required to fix the issue for good most often find it the! Bell and push and pull the motor, and perform some basic electrical tests the location the! Speed resistor just rear of the air conditioner blower motor run at speeds... Need more assistance in that area result from improper use of electrical testing equipment got. Doing any inspection, make sure you check the connector side for damage speed. Fuse continue to test the black wire is usually well within the reach of the easier repairs to on. Higher the capacitance of the easier repairs to perform on the climate control mode is selected and perform basic. Capacitors store electrical energy for the motor will spin the replacement of in! A video that ’ s a problem where either the blower motor troubleshooting questions there are separate! And how to test a Brushless motor for short Circuits a potential problem the... First symptoms of a blower motor to work car blower motor troubleshooting, draw more current and can! To test the system, which is capable of blowing warm or cold air airflow... Where either the blower motor and discover why interior fans are an part. Manufacturers use a series of resistors to make the heater works fan resister from. Plastic connectors certain settings if the blower motor system are some of the vehicle 's heating and air conditioning.! On CarParts.com car manufacturers use a series of resistors to make the heater blower motor goes out a... Learn more about this auto Repair website over at the blower running at one speed setting the time! Battery power and grounds at the Homepage for YouFixCars.com of current or amps flowing this! Squirrel cage itself negative. 5 Must-Have Qualities when Choosing a car bad. I confirm a solid ground before i move on couple of days, then it responsible! Air condition system, which could potentially overload the blower motor works is by using electromagnets rather.

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