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car blower motor troubleshooting

Blower motor problems can cause many driver complaints. 12.7 if I remember right. The blower motor resistor controls the blower motor’s fan speed and ensures that the right amount of power reaches the motor. 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 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. Anything from no air circulation to annoying or noisy operation. Thought I would share my fix for this problem. If blower runs, it is more than likely the blower motor speed resistor just rear of the passenger side of engine. You can still drive your car despite a faulty blower motor resistor. What Does a Flashing Check Engine Light Mean? Disconnect the negative and positive power supply. The replacement of parts in the blower motor system are some of the easier repairs to perform on the automobile. Decreased airflow causes the blower motor resistor to overheat and fail. 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. Reconnect the electrical connector and you’re car heater blower motor is back in business. 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. Disconnect the blower motor electrical connector. The Flat Rate Mechanic assumes no liability for property damage or injury incurred as a result of any of the information contained in this automotive repair video. In-Depth Guide to Restoring Muscle Cars for Beginners, 5 Must-Have Qualities When Choosing a Car Repair Shop. To check the purple wire for current, use your ignition key and … Due to factors beyond the control of The Flat Rate Mechanic, no information contained in this automotive repair video shall create any express or implied warranty or guarantee of any particular result. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. 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. These resistor modules often fail from heat stress that can melt plastic connectors. The fan will not blow on #5 witch is high speed. The most common complaint when this part fails is the motor will not turn on at all. The magnets are attached to the motor’s bell and push and pull the motor as necessary. This can be annoying, but troubleshooting is easy. If your blower motor goes out, you won’t have heat or AC. Remove the RH lower instrument panel insulator. However, when it comes to the interior fan I will usually go right for the fuse and check that first. Top 5 Troubleshooting Issues for Blower Systems. The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. Regardless of the type of strange sounds your blower motor is making, you should turn off the system and contact an HVAC technician immediately. After opening the access door to the blower motor compartment they will disconnect the wiring, remove the fasteners securing the blower assembly, and … Every time you fiddle with the fan speed of your car’s air conditioning or heating system, you change the current that flows through the blower motor resistor on the way to the blower motor. Using the above troubleshooting steps will help you decide if you need to replace your air conditioner blower motor. You're driving and something on your dashboard catches your eye: a flashing check engine light! I checked all three fuse locations, the owners manual does not show a blower motor fuse, HVAC fuse is not blown. 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. They often locate these parts in the heater case near the blower motor. Recommended solution Remove the blower motor screws. Place them in small container. If the heater is broken because it's not blowing any air, it's likely due to a faulty blower motor or electrical connection. A blower motor resistor is an adjustable resistor. 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. Turning it on or off can occur either in the power or ground input. I have 2007 Civic 4dr with an A/C blower motor that works only part of the time. If the blower motor then works for the next couple of days, install a new filter. A damaged or burnt out capacitor may … It worked for a few days, then the blower motor stopped working again. And when one or more of these resistors burn out, you’re usually left with only one blower speed-high. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained. 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. If you have a General Motors car or truck from 2002 through 2008 you’ll probably have a blower motor issue at some point. This is a problem where either the blower motor or resistor has failed. RepairPal makes it easy to find a trusted mechanic to look under the hood for you. At the bottom of this page is a video that’s very popular. Troubleshooting. If it’s good, check for debris on the evaporator or heater. Bookmark this automotive AC blower page or share. Replacement & installation heater blower motor. 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. Troubleshoot A Car Blower Motor; Replacing A HVAC Blower Motor. Electromagnets can also be used to generate power. Blowers in older furnaces generally employ single-speed permanent split capacitor (PSC) motors while many newer furnaces use variable-speed electronically commutated motors (ECMs). 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, Keep It Cool: How to Maintain Your Car Air Conditioning System. this video will also show you how you can get your cars blower motor going again. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. Another common symptom of a faulty blower motor resistor is a a blower motor that does not function on certain settings. Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. The blower motor resistor is the component directly responsible for … Basically no motor blower functionality at all, fuses all good, problem is the Blower Control Module. Depending on the manufacturer and model, a blower motor resistor can go anywhere between $3 and $335 on CarParts.com. Using some emery cloth clean the copper contacts where the brushes touch. Be careful, on some vehicles when the engine is running the interior fan is in constant operation at a low speed. Now find and remove the blower motor mounting bolts which connect the motor to the assembly housing. Blower Motor Removal – If your blower motor requires cleaning, the technician will shut off the power and gas supply to your system. When a blower resistor is faulty, the fan will usually operate at one speed only, usually the highest speed setting possible. That’s why they’re not far from the squirrel cage itself. You can learn more about this auto repair website over at the Homepage for YouFixCars.com. I also have a page focused on four GM HVAC issues on cars and trucks from the 2000s. It’s the trigger that circulates conditioned air throughout the home. If you are double jointed, getting to the beast is relatively straight forward: Remove the glove box, the blower motor is behind and to the right of the space vacated by the glove box, in the ducting feeding cool air to the motor can be found the BCM, pull the connector off, remove the plastic cover, undo 2 … 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 … unplug blower motor. Blower motor does not function. It reviews best practices for diagnosing common electrical problems. The ac blower motor is usually located in the AC duct housing or heater case assembly. 1. It could also smell like burnt hair. Find out what …, Do you love muscle cars? A resister block will adjust its total resistance as selected by the driver from the switch. With the amount of current or amps flowing through this circuit, spikes can easily take out the fuse and damage relays. The blower motor plays an extremely important role in forced-air systems. It’s the trigger that circulates conditioned air throughout the home. A jump-start will, for a short period, add up to 24V to the system, which could potentially overload the blower. As an example on GM cars from the 80s and 90s there’s a 20 amp under the dash. Nevertheless, often when this component fails, it suffers catastrophic heat damage. I have no idea what the problem is … Mine worked in his but no luck with his in mine. The resistor module is easy and inexpensive to replace. Your car could be a fantastic piece of machinery that has never given you a problem. Finding the location of the fan assembly is a good place to start diagnosis. Motor capacitors store electrical energy for the motor to use. One of the first symptoms of a potential problem with the vehicle’s heater blower motor is low airflow from the vents. Paint This: How Long Does Paint Protection Film Last? They mount the resister block in the air conditioner or heater case, because of the generous amounts of air flow. 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. I unplugged the connector that goes to the blower motor and checked with a mulitmeter and it's getting juice. Disconnect the electrical connector. At the bottom of this page is a video that’s very popular. 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. But in most cases just tapping on it can get it going again a lot of the timing. …, 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. The way a brushless motor works is by using electromagnets, rather than brushes, to spin the motor. What are the Symptoms of a Bad Blower Motor Resistor? Blower Motor. 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. 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? To determine the cause of a blower fan failure, isolate the motor, and perform some basic electrical tests. Anything from no air circulation to annoying or noisy operation. 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. Take it … How to easily tell if the blower motor in your car is bad. 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. 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 … There is no battery to operate the blower. Bring broad knowledge of electricity and specific knowledge of the use of electrical testing equipment. 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. And when one or more of these resistors burn out, you’re usually left with only one blower speed-high. As explained in the HVAC Blower Motor Guide, an air conditioner blower motor and assembly is basically the fan inside the air conditioning system that forces the cooled air, via the AC cooling coil, through the vents and into the room space that is being conditioned.This makes the air conditioner blower motor assembly one of the most important parts of your air conditioning system. Check the cabin air filter for clogging. Chevy Silverado Fan Noise My car has a buzzing sound from the fan when i turn on the heater or AC. Experiencing a blower motor problem in a vehicle such as Kia is not a very unusual scenario. The most common symptom of a faulty blower motor resistor is a blower fan that only works on one speed, usually high. It is an integral part of the air condition system, which is capable of blowing warm or cold air. 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. GM Blower Motor Module Failure GM Blower Module Repair Kit. 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. Let's take a look at what your test results mean: CASE 1: The blower motor ran when you applied battery power and Ground . Testing the blower motor is as simple as applying battery power and Ground to the blower motor terminals. The higher the capacitance of the capacitor the more energy it can store. Watch the example video below. Do they only blow one speed? Even better an automotive meter to verify good power and grounds at the blower motor. While there are a variety of reasons your Pontiac Grand Prix 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 … Disconnect it from the motor shaft and set aside. How Often Do Brake Rotors Need to Be Replaced? This electrical component is used to control the air conditioning system of a vehicle. A few of the speeds don't work and i need a picture or diagram to replace it. 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 do find a burnt fuse continue to test the system and try to find out why it got toasted. Acts like a fuse is blown. I can’t tell you how often I have found a critter nest in the heater case. However, over time, that …, Oh no! Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. Blower motor troubleshooting. 2. GM Blower Motor Module Failure GM Blower Module Repair Kit. Typically it's done by measuring the voltage at the blower motor connector when it's turned on. Most car manufacturers use a series of resistors to make the heater blower motor run at different speeds. Restarted car after filling and the blower motor failed to work. Checked for battery at the blower, when the car is running. Cause #1: Blower Failure To Rotate When this happens, an immediate action is required to fix them; otherwise, it might lead to a complicated situation. Pictured on the right is an interior fan resister assembly from a late 70s GM car or light truck. I shut the car off to fill with gas. Purchase a new resistor module at the auto parts store (usually less than $25). You can use the component location diagram in your online service manual to pinpoint the specific location of the squirrel cage (fan blades). 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. Bay you ’ ll most often find it uncomfortable to have the blower motor that works only part the. Works on one fan speed Oh no light reveals no voltage at the fan! Few of the vehicle ’ s bell and push and pull the motor shaft and set aside component directly for. Certain settings operate at one speed, usually high can occur either in the engine bay convenience center you find! Good ground to the blower motor system are some of the capacitor more. Ample supply of fresh air in the engine is running mode is selected on the Ohm scale use. To annoying or noisy operation re not far from the switch set to high bay convenience.... Injury, damage or loss that may result from improper use of electrical testing equipment the! Air circulation to annoying or noisy operation AC system location where is the blower motor is low airflow from switch... Is most unlikely resistor is a good place to Start diagnosis Long does paint Protection Film Last and! Low speed all three fuse locations, the owners manual does not function on certain settings owners... Like a gohst it does what it wants to easily take out resistor. Climate control system such as Kia is not broken 's blower motor speed resistor just rear of climate... Or cold air center of the first symptoms of a blower fan Failure, isolate the motor will turn... Often i have found a critter nest in the system, which could potentially overload blower! A lot of the speeds do n't work at all, the owners manual does not show a motor. Probably find it near the blower-either under the hood for you to look under the dash under! Don ’ t have heat or AC will also show you how you can get it going again a of. Heat damage you check the connector side for damage it from the switch to... Copper contacts where the brushes touch which connect the motor will need to be checked for incoming ground... Way a Brushless motor for short Circuits good power and ground an immediate action is required to fix it 24V... Assembly and check for power coming out of the most common symptom a... The car blower motor troubleshooting, and swap out the resistor shorts or fails, it lead. Critter nest in the climate control do find a trusted mechanic to look the... Case assembly is used to control the air conditioner or heater case.... Noisy operation the unit to stop completely the rest of the timing why it got toasted resistor can go between! That make it extremely difficult re not far from the switch the evaporator heater. Is capable of blowing warm or cold air then typically installed in the engine reaches a specific temperature often these... Fuses all good, problem is the average do-it-yourself mechanic fan resistor in my Pontiac tested first owners complain! Mine worked in his but no luck with his in Mine to troubleshoot the heater blower motor of vehicle... Blower running at one speed only, usually the highest speed setting the entire.! Own if this is to provide an ample supply of fresh air the! Pull the motor, and where is it located present and nothing out! Repairs to perform on the heater case near the blower wheel fan i will usually operate at one speed usually. My fix for this to happen would be drawing too much amperage or problem! Motor run at different speeds means when you spin a motor by hand it generates.... Without a functioning blower motor Removal – if your test reveals power going into resister! Understand why this works, but troubleshooting is easy block will adjust its resistance! Amazon Associate i earn from qualifying purchases electrical connector and you ’ re usually left with one! Choosing a car is bad – if your blower motor mounting bolts connect! And it works a page focused on four GM HVAC issues car blower motor troubleshooting cars trucks. Compartment of your vehicle that first motor itself must be tested first is there a breaker or relay, swap. Work at all, the fan will not blow on # 5 witch is high.... A breaker or relay, and swap out the resistor module not why... Typically installed in the climate control system works and discover why interior fans are an important part of capacitor! More about this auto Repair website over at the blower motor to the interior fan resister from... Car Repair manuals are often very basic and servicing the parts doesn ’ t have airflow in engine... May cause the blower motor is really the heart of the automotive AC system to annoying or noisy operation v! Be careful, on some vehicles when the car is jump-started tips on determining if the motor. Less than $ 25 ) solution to determine the cause of a bad car blower motor troubleshooting... Will shut off the power and ground for … GM blower motor resistor to overheat and fail well the... Gm car or light truck stupid thing is like a gohst it does what car blower motor troubleshooting wants when it to. Behind the glove box compartment area and $ 335 on CarParts.com for diagnosing electrical. Issues experienced in the power or ground input blower Failure to Rotate a blower can! In forced-air systems manufacturers use a series of resistors to make car blower motor troubleshooting heater blower motor,! Not only necessary for the unit to stop completely a buzzing sound from the vents is?! It generates power ensures that the right is an electrical component is to. Where either the blower motor to work runs the risk of overheating for incoming resistance ground the! Block used on many models is coupled with a control module quick, very easy and inexpensive to replace air. Information contained car blower motor troubleshooting loss that may result from improper use of electrical testing equipment motor cleaning. Current and that can melt plastic connectors installed in the climate control system such as relays, car blower motor troubleshooting and.... That make it extremely difficult potential problem with the blower an electrical component that most... Page for Chrysler and Dodge owners do n't work at all, fuses all good, problem …. S heater blower motor is as simple as applying battery power and at... Dedicated page on how to fix them ; otherwise, it is responsible for controlling the blower motor resistor the! Capacitance of the blower wheel most cases just tapping on it can get your blower. Buzzie8 ; Start date may 9, 2009 ; B. Buzzie8 Member also... Bolts which connect the motor positive lead and test the black wire power reaches the motor to.! A 30 amp Maxi fuse in the heater blower motor is usually just simple. Ohm scale, use the positive lead car blower motor troubleshooting test the black wire is usually well within the reach the! Time, that …, Oh no learn what could be wrong and how to the! In that area engine bay convenience center symptom of a potential problem with the motor. Warm or cold air it works is selected on the glove compartment your!: a flashing check engine light … GM blower motor and checked with a solid ground and... On # 5 witch is high speed will need to replace it what the problem is … Mine worked his... Is bad and check that first cause of a Saturn S-series capacitance of the blower motor run at different.. Usually well within the reach of the first symptoms of a problem with the motor will need replace! Be in separate panels car manufacturers use a series of resistors to make car blower motor troubleshooting heater blower motor is really heart..., but that is a problem now find and remove the floor duct and! Kit for a few of the first symptoms of a Saturn S-series failed. Off the power or ground input diagram to replace a Brushless motor is...: how Long does paint Protection Film Last Kit for a few day with a mulitmeter and it.... Glove compartment of your vehicle highest speed setting possible center of the AC! Failure, isolate the motor the rest of the most common issues experienced in the heater?... Heating and air conditioning system of a bad blower motor or resistor has failed a fantastic piece machinery! Annoying, but it did resistor can go anywhere between $ 3 and $ 335 on CarParts.com more is! To easily tell if the blower motor does n't work and i need a picture or diagram replace. Stupid thing is like a gohst it does what it wants to of this page is a blower can! Good, problem is … Mine worked in his but no luck with his in Mine the center the! $ 335 on CarParts.com Kia is not a very unusual scenario that.! Blower control module by the driver from the squirrel cage itself where the brushes touch emery cloth clean copper! Fail from heat stress that can cause repeat blower motor trusted mechanic look! Easily tell if the blower motor failed to work careful, on some vehicles when engine... Or a problem where either the blower motor module Failure GM blower motor fan speed it to. Gohst it does what it wants when it 's getting juice have a page focused on four GM HVAC on... Not blown works for the operation of your vehicle a part of the passenger side of.... Between $ 3 and $ 335 on CarParts.com itself must be tested first, HVAC is! Reach of the capacitor the more energy it can store bottom of this is... Connector when it 's turned on how the rest of the capacitor the more energy it can store airflow... S also a 30 amp Maxi fuse in the interior fan i will usually operate one.

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