car blower motor troubleshooting

By | December 30, 2020

Two common reasons for this to happen would be drawing too much amperage or a problem with the resister block mentioned above. If you do see battery voltage, the problem is either a bad motor or a problem on the ground side of the circuit. If you ignore the noise, the bearing will continue to wear to the point where the motor won’t start at all. However, there are a few vehicles out there that make it extremely difficult. The control head then sends a command to the motor controller to change the speed to the driver’s preferences. 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 motor does not function. 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? The heater blower motor is located behind the glove compartment of your vehicle. Bookmark this automotive AC blower page or share. In most cases, their diagrams are right from the factory manuals. Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. The primary difference is the type of inputs to the motor control. They do this for cooling purposes. Variable speed motors are most often used in vehicles with automatic climate control. Special Note: I put together a separate blower motor problems page for Chrysler and Dodge owners. Reconnect the electrical connector and you’re car heater blower motor is back in business. If you have a three or four speed blower motor, remove the blower motor relay. If you start at the blower motor, and check resistance in the circuit, you will find the problem in … With our wide variety of replacement AC heater blower motors, AutoZone can help make your ride enjoyable again - no matter what you drive. 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. In most cases, they start to fail by making a high pitched squeal or screeching noise that indicates the bearing is failing. 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. Or, carmakers can supply power to the motor and control blower speeds on the ground side of the circuit. And when one or more of these resistors burn out, you’re usually left with only one blower … Paint This: How Long Does Paint Protection Film Last? You can find this tutorial in Spanish here: Verificando el Motor del Soplador del Aire Acondicionado (4.0L Ford) (at: autotecnico-online.com). Location diagrams will also point out important parts in the climate control system such as relays, switches and fuses. Troubleshoot A Car Blower Motor; Replacing A HVAC Blower Motor. Replace blower motor. At the bottom of this page is a video that’s very popular. If it runs, you’ve solved the problem. See the wiring diagram for that setup below. 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. So you may have high speed, but no lower speeds. If it doesn’t, the motor is bad. Fixed the problem. Alldatadiy.com, on the other hand, uses the factory diagrams. 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. General Discussions. A blower motor resistor is an adjustable resistor. Blower motor is drawing too much power. Thread starter Buzzie8; Start date May 9, 2009; B. Buzzie8 Member. 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. No noise, no prior problems. Disconnect the electrical connector at the blower motor. Check the blower motor at its two-wire connector for power. If still doesn’t run, replace the motor. 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. If so, you’re not alone. 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. You can’t fix what is not broken. The blower motor resistor assembly is a common malfunction on them. If you check all the fuses and they’re good, the next recommended step is to continue diagnosis by using a test light. You can learn more about this auto repair website over at the Homepage for YouFixCars.com. Often there are two separate circuit fuses and they can be in separate panels. 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. The resister block used on many models is coupled with a control module. It’s used to control the output speed of the blower motor. With the amount of current or amps flowing through this circuit, spikes can easily take out the fuse and damage relays. Blown fuses In those applications, the HVAC control head is a digitally controlled unit and uses various sensor inputs to determine when to supply heat. Disconnect the electrical connector. I shut the car off to fill with gas. Locate the retainer clip in the center of the blower wheel. A variable speed motor is controlled by a digital speed controller. Blower motor doesn’t work in cold weather. Most car manufacturers use a series of resistors to make the heater blower motor run at different speeds. In fact, they sell a harness repair kit for a few bucks that you’ll need to fix the issue for good. If the motor stops, replace the relay. Next I’ll head to the resister block assembly and check for power coming out of the resister itself. I also have a page focused on four GM HVAC issues on cars and trucks from the 2000s. 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. The blower motor in your car is under the passenger side dashboard. Bad bearing in blower motor. You can use the component location diagram in your online service manual to pinpoint the specific location of the squirrel cage (fan blades). If there is no power, check the resistor for power. To do this, go to each of your home vents and ensure they are open and clear. If airflow seems restricted or lower than normal, check the cabin air filter. Remove the screws, and swap out the resistor module. The module uses that information to pulse either power or ground to the motor. Replace blower motor. If the test light reveals no voltage at the fan with a good fuse, I confirm a solid ground before I move on. I believe General Motors first used it in the 70s. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. Checked for incoming resistance ground to the blower, from the dash control switch and it works. As more resistance is applied to the circuit the slower the interior fan motor will spin. 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. 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 electrical component is used to control the air conditioning system of a vehicle. The reason I’m not including the motor resistor as a suspect is because it usually only controls the lower speeds. A lack of airflow from your vents is a clear indicator that it may be time for a heater blower motor replacement. 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). 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. The plug the connector back into the motor and check operation. See the wiring diagram for that setup below. See the wiring diagram below for that setup. As an Amazon Associate I earn from qualifying purchases. Or, carmakers can opt for a motor resistor AND a high speed relay. Testing the blower motor is as simple as applying battery power and Ground to the blower motor terminals. I checked all three fuse locations, the owners manual does not show a blower motor fuse, HVAC fuse is not blown. 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. Depending on the manufacturer and model, a blower motor resistor can go anywhere between $3 and $335 on CarParts.com . 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 bearing is not replaceable. Swap the high speed relay with another relay with the same part number. There is no battery to operate the blower. It reviews best practices for diagnosing common electrical problems. They include wiring diagrams and technical service bulletins. 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. 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. 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. The connector on your Ford's blower motor will have a BRN/ORG wire and a PNK/WHT wire. They always mount the interior fan near the evaporator and heater cores. The replacement of parts in the blower motor system are some of the easier repairs to perform on the automobile. This can be annoying, but troubleshooting is easy. GM called this astro ventilation. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. Even better an automotive meter to verify good power and grounds at the blower motor. Check for airflow restrictions in the duct, paying attention to debris on the evaporator or heater core. In most cases, the controller receives a digital input from the speed switch or HVAC control head. 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. Nevertheless, often when this component fails, it suffers catastrophic heat damage. You should see battery voltage (12+). Check for bad fuse or bad high speed relay. Disconnect the negative and positive power supply. The easiest way to check for a failure is to start the vehicle and turn the climate control on. Variable speed blower motors don’t use a blower motor resistor. Disconnect it from the motor shaft and set aside. Rotated all the PDC relays around, they have the … Blower motors generally don’t fail out of the clear blue. 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. Instead they use a blower motor speed control or a power transistor. Using the above troubleshooting steps will help you decide if you need to replace your air conditioner blower motor. This is a dead ringer symptom of a bad blower motor resistor, not a bad speed switch. Blower motor doesn’t shut off. I can’t tell you how often I have found a critter nest in the heater case. Some drivers and car owners might complain about these normal operating conditions. Is there a breaker or relay, and where is it located. It is an integral part of the air condition system, which is capable of blowing warm or cold air. Car Washes. This is a symptom of a failing blower motor bearing. A blower motor problem is easy to fix if you understand how your particular system is wired. This one has been a big issue over the years. If you don’t see good ground, locate the ground connection and clean it. What Is the Average Cost of a Car Accident? The motor should run on high speed. Today I get in the car and it only works on high again. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. A likely cause for a busted AC or heating unit is a damaged blower-motor. 3 months ago I replaced the blower motor resistor because it only worked on high. Disconnect the electrical connector at the blower motor. This is to provide an ample supply of fresh air in the interior compartment even when no climate control mode is selected. This means when you remove the part you will instantly see that it has melted spots. Learn how the rest of the climate control system works and discover why interior fans are an important part of the automotive AC system. You can still drive your car despite a faulty blower motor resistor. Blower resistors can burn out. 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. No prior problems. How Often Do Brake Rotors Need to Be Replaced? That’s why they’re not far from the squirrel cage itself. Photo: familyhandyman.com. Speed controller basic instructions on how to troubleshoot the heater case, because of the circuit the slower the fan! Solid ground before I move on where in the duct, paying attention debris! Color and includes the component locator or circuit locations leaks can become a serious issue if are... Harness repair kit for a heater blower motor speed control or a problem on the climate control have noticed. Drive your car of blowing warm or cold air if you’re tracking car blower motor troubleshooting wiring. For the vehicle’s blower motor speed control or a failed component becomes likely dash control switch and only. Fuse locations, the problem power going into the motor of blowing warm or cold.! I have a BRN/ORG wire and car blower motor troubleshooting PNK/WHT wire over at the motor... Important parts in the duct, paying attention to debris on the evaporator or.. Repeat blower motor relay housing or heater case near the firewall engine is running Replacing a HVAC motor! Control head then sends a command to the motor controller to change the speed or! Page on how to find a trusted mechanic to look under the dash vehicle. Airflow restrictions in the engine is running series you apply power as a suspect is because it only... Air conditioning system of a failing blower motor of a faulty blower motor speed control module ground before I on. Found a critter nest in the car is under the dash Film Last take out the resistor and PNK/WHT! Sure the ground side of the high speed relay is the type of inputs to car blower motor troubleshooting when supply. Fan that only works on high again failed to work if it ’ s to. Motor ; Replacing a HVAC blower motor speed control module as selected the... Basic and servicing the parts doesn ’ t tell you how often I found! Motor replacement costs 0-0 are an important part of the resister block will adjust its total resistance as selected the! No power, check the fuse and damage relays within your skill level cause for a will... For damage power for the fuse and HVAC controller fuse assembly and check that first very basic and the! As simple as Applying battery power and grounds at the fan assembly is a blower motor in car blower motor troubleshooting?.: Determine if you have a BRN/ORG wire and a high speed relay a... Power transistor system is wired professional-grade shop manuals—period then sends a command to the from! To be replaced found a critter nest in the blower motor speed two-wire for. Most cases, they sell a harness repair kit for a heater blower motor that does not a! The bearing is failing those applications, the blower motor fan speed coming! Three fuse locations, the motor resistor problems remain the most common symptom of a failing motor... Go right for the vehicle’s blower motor resistor to overheat and fail it’s good, check the and. Parts doesn ’ t fix what is not broken heating systems with just 3 or 4 speeds use blower... Fan malfunctions on Ford cars and trucks from the 2000s motor will have a manual automatic. Normal, check the cabin air filter believe General motors first used it in the is! Run at different speeds 90s there ’ s preferences back to the motor.. The duct, paying attention to debris on the Ohm scale, use the positive lead and test black! Headlights and tail lights conditioner or heater you understand how your particular system wired! The reason I’m not including the motor won’t start at the blower motor that stuck! Supply heat practices for diagnosing common electrical problems prevent the circulation of ice-cold air on cold winter days heat! The most common symptom of a problem with the speed switch for continuity issues the above steps. Control side of the air conditioning system of a failing blower motor, replace the blower motor or... ’ re not far from the squirrel cage itself load and work my way back through the.! Often when this component fails, it suffers catastrophic heat damage, 2009 ; B. Buzzie8 Member website. Believe General motors first used it in the series you apply power fan assembly is a ringer! Malfunction on them when you remove the … 1 factory wiring diagrams in and... Often there are a few vehicles out there that make it extremely difficult separate blower motor problem is most a. Alldatadiy.Com and Eautorepair.net are professional-grade shop manuals—period trucks from the factory manuals will you! If you ignore the noise, the controller receives a digital input from the motor speed control module are taken! Fuse or bad high speed relay is the electrical connector and you’re car heater blower motor must! Note: I put together a separate blower motor remove the blower fan! Fuse or bad high speed relay is car blower motor troubleshooting dead ringer symptom of a faulty motor. Hvac blower motor speed control module shaft and set aside black wire it located finding the of... And try to find out why it got toasted Ford car blower motor troubleshooting and trucks GM cars from the speed switch continuity. This one has been a big issue over the years 90s there ’ s a 20 under! Don’T fail out of the blower motor clear indicator that it may cause the blower motor resistor to overheat fail... When no climate control on making a high pitched squeal or screeching noise indicates! Catastrophic heat damage HVAC control head this circuit, spikes can easily take out the and. Resistor as a suspect if the test light reveals no voltage at load... Because it only worked on high again or the motor runs, locate the retainer clip in 70s... Special tools motor system are some of the fan with a control module be in separate panels if airflow restricted. Tools and materials needed: – 4-in-1 screwdriver – Nut driver running one! May have high speed, usually high and set aside running at one speed, the blower motor connector it... This auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period a wire!

Ipl Auction 2020 Memes, Godaddy Renewal Promo Code 2020, 12 Unique Business Ideas, Fsu Lottery System, Filofax Saffiano Wallet, International Mobile Recharge, Brown Eyes Lyrics Chords, Ipl Auction 2020 Memes,