One of the first symptoms of a potential problem with the vehicle’s heater blower motor is low airflow from the vents. 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. You can still drive your car despite a faulty blower motor resistor. I unplugged the connector that goes to the blower motor and checked with a mulitmeter and it's getting juice. 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. Locate the retainer clip in the center of the blower wheel. Disconnect the negative and positive power supply. RepairPal makes it easy to find a trusted mechanic to look under the hood for you. How to troubleshoot where neither AC nor the heater works? unplug blower motor. 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. 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. If the blower motor then works for the next couple of days, install a new filter. If your blower motor goes out, you won’t have heat or AC. The most common complaint when this part fails is the motor will not turn on at all. 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. You can’t fix what is not broken. Pictured on the right is an interior fan resister assembly from a late 70s GM car or light truck. Typically it's done by measuring the voltage at the blower motor connector when it's turned on. Two common reasons for this to happen would be drawing too much amperage or a problem with the resister block mentioned above. Chevy Silverado Fan Noise My car has a buzzing sound from the fan when i turn on the heater or AC. Here are five of the most common issues experienced in the field. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. 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. Blown fuses Thread starter Buzzie8; Start date May 9, 2009; B. Buzzie8 Member. Bookmark this automotive AC blower page or share. The blower motor plays an extremely important role in forced-air systems. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. A blower motor resistor is an adjustable resistor. 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. 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. Take it … What Is the Average Cost of a Car Accident? Check the cabin air filter for clogging. Blowers in older furnaces generally employ single-speed permanent split capacitor (PSC) motors while many newer furnaces use variable-speed electronically commutated motors (ECMs). A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. When I diagnose electrical problems, I start at the load and work my way back through the circuit towards the battery. You're driving and something on your dashboard catches your eye: a flashing check engine light! 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. Be careful, on some vehicles when the engine is running the interior fan is in constant operation at a low speed. 5. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. Disconnect the negative and positive power supply. You’ll have to decide on your own if this is within your skill level. After a few day with a new board the stupid thing is like a gohst it does what it wants when it wants to. The blower motor relay is what cuts on the blower … Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained. 1. In-Depth Guide to Restoring Muscle Cars for Beginners, 5 Must-Have Qualities When Choosing a Car Repair Shop. Regardless of the type of strange sounds your blower motor is making, you should turn off the system and contact an HVAC technician immediately. Disconnect the electrical connector. At the bottom of this page is a video that’s very popular. Troubleshooting. Blower motor problems can cause many driver complaints. How to Test a Brushless Motor for Short Circuits. When a blower resistor is faulty, the fan will usually operate at one speed only, usually the highest speed setting possible. Anything from no air circulation to annoying or noisy operation. The way a brushless motor works is by using electromagnets, rather than brushes, to spin the motor. Blower motor problems can cause many driver complaints. 26 year ASE Master Automotive Technician and Advanced level ASE certified here to help you save money on your automotive repairsThe Flat Rate Mechanic is a participant in the Amazon Influencer Program. General Discussions. What are the Symptoms of a Bad Blower Motor Resistor? It could also smell like burnt hair. run positive and ground jumpers direct from battery to check in blower motor works. I believe General Motors first used it in the 70s. The heater blower motor is located behind the glove compartment of your vehicle. However, there are a few vehicles out there that make it extremely difficult. Remove the floor duct screw and the floor duct. GM called this astro ventilation. If your fan is not working, or will not turn ON, then it is often associated with the motor not working. Shop for New Auto Parts at 1AAuto.com http://1aau.to/c/112/aF/blower-motor Have the fans stopped blowing in your vehicle? General Discussions. After opening the access door to the blower motor compartment they will disconnect the wiring, remove the fasteners securing the blower assembly, and … Using the above troubleshooting steps will help you decide if you need to replace your air conditioner blower motor. Fixing your own problems in this system is usually well within the reach of the average do-it-yourself mechanic. This electrical component is used to control the air conditioning system of a vehicle. What Does a Flashing Check Engine Light Mean? The heater blower motor is located behind the glove compartment of your vehicle. Testing the blower motor is as simple as applying battery power and Ground to the blower motor terminals. Disconnect the blower motor electrical connector. Blower motor does not function. A wiring diagram for the specific vehicle is also helpful. If the test light reveals no voltage at the fan with a good fuse, I confirm a solid ground before I move on. No noise, no prior problems. Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. Unscrew all the screws on the blower motor. 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. The resister block used on many models is coupled with a control module. If so, you’re not alone. Car Washes. No prior problems. The magnets are attached to the motor’s bell and push and pull the motor as necessary. Remove the RH lower instrument panel insulator. I have a dedicated page on how to find electrical shorts if you need more assistance in that area. Electromagnets can also be used to generate power. If blower runs, it is more than likely the blower motor speed resistor just rear of the passenger side of engine. Without a functioning blower motor your engine runs the risk of overheating. It’s then typically installed in the ductwork, near the blower-either under the dash or under the hood. I checked all three fuse locations, the owners manual does not show a blower motor fuse, HVAC fuse is not blown. Do they only blow one speed? 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 the heater is broken because it's not blowing any air, it's likely due to a faulty blower motor or electrical connection. This is a problem where either the blower motor or resistor has failed. I shut the car off to fill with gas. Top 5 Troubleshooting Issues for Blower Systems. On vehicles with early climate control systems the fans may not activate until the engine reaches a specific temperature. Troubleshoot A Car Blower Motor; Replacing A HVAC Blower Motor. How Often Do Brake Rotors Need to Be Replaced? 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. 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. The Flat Rate Mechanic recommends safe practices when working on cars or trucks with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this repair video. 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. There is no battery to operate the blower. Make sure you check the connector side for damage. Read below how Experts have answered blower motor troubleshooting questions. But in most cases just tapping on it can get it going again a lot of the timing. Troubleshoot A Car Blower Motor; Replacing A HVAC Blower Motor. Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. 2. Blower motor circuits are often similar in design. A jump-start will, for a short period, add up to 24V to the system, which could potentially overload the blower. If you check all the fuses and they’re good, the next recommended step is to continue diagnosis by using a test light. 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. Special Note: I put together a separate blower motor problems page for Chrysler and Dodge owners. Most car manufacturers use a series of resistors to make the heater blower motor run at different speeds. 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 … It reviews best practices for diagnosing common electrical problems. Checked for incoming resistance ground to the blower, from the dash control switch and it works. Checked for battery at the blower, when the car is running. …, 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. Next I’ll head to the resister block assembly and check for power coming out of the resister itself. 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. If it’s in the engine bay you’ll most often find it near the firewall. 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. When you spin a motor by hand it generates power. The blower motor resistor controls the blower motor’s fan speed and ensures that the right amount of power reaches the motor. 2. A blower motor resistor is an adjustable resistor. This solution is quick, very easy and cheap (about $20). Experiencing a blower motor problem in a vehicle such as Kia is not a very unusual scenario. Rotated all the PDC relays around, they have the same ID, … Without it, you don’t have airflow in the system. 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. Anything from no air circulation to annoying or noisy operation. 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. A bad motor capacitor may cause starting problems or could shut off the motor while running. The blower motor plays an extremely important role in forced-air systems. It is responsible for controlling the blower motor’s fan speed. Is there a breaker or relay, and where is it located. Blower motor troubleshooting. The blower motor resistor is the component directly responsible for … Blower Motor Removal – If your blower motor requires cleaning, the technician will shut off the power and gas supply to your system. It reviews best practices for diagnosing common electrical problems. 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 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. Place them in small container. Reduced airflow also causes the blower motor to work harder, draw more current and that can cause repeat blower motor resistor failures. 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. 12.7 if I remember right. The fan will not blow on #5 witch is high speed. Blower motor fuse blows repeatedly. If you start at the blower motor, and check resistance in the circuit, you will find the problem … The replacement of parts in the blower motor system are some of the easier repairs to perform on the automobile. 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. Decreased airflow causes the blower motor resistor to overheat and fail. 2. It’s used to control the output speed of the blower motor. As more resistance is applied to the circuit the slower the interior fan motor will spin. Your car's blower motor is not only necessary for the operation of your air conditioner. This means when you remove the part you will instantly see that it has melted spots. Am automobile blower motor is usually just a simple dc motor. 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. In fact, they sell a harness repair kit for a few bucks that you’ll need to fix the issue for good. Troubleshooting Guide Choose your car’s symptom to learn what could be wrong and how to fix it. 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. Automotive Blower Motor. this video will also show you how you can get your cars blower motor going again. To determine the cause of a blower fan failure, isolate the motor, and perform some basic electrical tests. I also have a page focused on four GM HVAC issues on cars and trucks from the 2000s. Troubleshooting Guide Choose your car’s symptom to learn what could be wrong and how to fix it. Reconnect the electrical connector and you’re car heater blower motor is back in business. It’s the trigger that circulates conditioned air throughout the home. 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. 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. And when one or more of these resistors burn out, you’re usually left with only one blower speed-high. How to easily tell if the blower motor in your car is bad. The same effect can be seen when a car is jump-started. This electrical component is used to control the air conditioning system of a vehicle. The problem may also be with the blower switch, but that is most unlikely. 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 resistors’ internal components fail it may cause the blower motor to malfunction, or not function at all on one or more of the settings. 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. I have 2007 Civic 4dr with an A/C blower motor that works only part of the time. It worked for a few days, then the blower motor stopped working again. I have no idea what the problem is … To check the purple wire for current, use your ignition key and … The ground or negative is the lower blade. Remove the blower motor screws. Cause #1: Blower Failure To Rotate As an Amazon Associate I earn from qualifying purchases. As an example on GM cars from the 80s and 90s there’s a 20 amp under the dash. GM Blower Motor Module Failure GM Blower Module Repair Kit. Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. The resistor module is easy and inexpensive to replace. Nevertheless, often when this component fails, it suffers catastrophic heat damage. 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. They mount the resister block in the air conditioner or heater case, because of the generous amounts of air flow. Blower Motor. Another common symptom of a faulty blower motor resistor is a a blower motor that does not function on certain settings. Mine worked in his but no luck with his in mine. A few of the speeds don't work and i need a picture or diagram to replace it. You can use the component location diagram in your online service manual to pinpoint the specific location of the squirrel cage (fan blades). This can be annoying, but troubleshooting is easy. Acts like a fuse is blown. When this happens, an immediate action is required to fix them; otherwise, it might lead to a complicated situation. With the amount of current or amps flowing through this circuit, spikes can easily take out the fuse and damage relays. Some drivers and car owners might complain about these normal operating conditions. Now find and remove the blower motor mounting bolts which connect the motor to the assembly housing. And when one or more of these resistors burn out, you’re usually left with only one blower speed-high. If your test reveals power going into the resister with a solid ground present and nothing coming out, a failed component becomes likely. If the blower motor doesn't work at all, the blower motor itself must be tested first. Your car could be a fantastic piece of machinery that has never given you a problem. Blower Motor Resistor Location Where is the blower fan resistor in my Pontiac. The higher the capacitance of the capacitor the more energy it can store. If you do find a burnt fuse continue to test the system and try to find out why it got toasted. Remove the screws, and swap out the resistor module. The blower motor will need to be checked for 12V with the switch set to high. Remember, you need a good ground to complete the circuit. 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 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. A damaged or burnt out capacitor may … Location diagrams will also point out important parts in the climate control system such as relays, switches and fuses. Often there are two separate circuit fuses and they can be in separate panels. Paint This: How Long Does Paint Protection Film Last? 4. I was told the control pannel was out on this car I replaced the blower resistor and control pannel twice. Restarted car after filling and the blower motor failed to work. Depending on the manufacturer and model, a blower motor resistor can go anywhere between $3 and $335 on CarParts.com. 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. … How to easily tell if the blower motor in your car is bad. So if you turn on your HVAC and you don’t hear anything, you might start by checking out the blower motor operation. Finding the location of the fan assembly is a good place to start diagnosis. Purchase a new resistor module at the auto parts store (usually less than $25). The blower motor is really the heart of the HVAC system. Thread starter Buzzie8; Start date May 9, 2009; B. Buzzie8 Member. 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It on or off can occur either in the center of the motor!, add up to 24V to the blower wheel bell and push and the... Present and nothing coming out of the vehicle ’ s fan speed here are five of the air conditioning of. Direct from battery car blower motor troubleshooting check in blower motor resistor controls the blower motor of a faulty blower motor resistor the., which could potentially overload the blower motor resistor to overheat and fail automotive AC system has. Three fuse locations, the technician will shut off the power and supply. Four GM HVAC issues on cars and trucks from the dash control switch it! Car has a buzzing sound from the 80s and 90s there ’ s heater blower motor is really heart. The generous amounts of air flow a lot of the most common complaint when part.