Detach the blower motor from its connector. I have replaced the resistor pack and the blower motor switch and neither has resulted in a change. Once it is discharged, use a capacitor tester to check the microfarad reading. Open up the blower compartment of the furnace or air handler. If the motor itself has developed a fault, the fault may be a burnt wire or connection, a winding failure including insulatio⦠Open up the blower compartment of the furnace or air handler. If you find one, replace it. An A/C blower motor resistor uses resistance to control the speed of the blower motor. The white wire is called the run wire. You may find that when it runs ungrounded that the casing becomes live at up to supply voltage. Put 24 volts to pins 12 and 15 and 24 volt common to pins 1 and 3 at the motor (fig. This is a very easy test and it will let us know if the blower motor uses too much current. Both the front blower motor resistor and the optional rear heater-A/C unit blower motor resistor can be diagnosed using the procedure that follows. Any value less than about 0.2 mega ohms is a reason to discard the motor. The first step you can do is to check that the furnace is getting power, if there is no power then the furnace blower motor will not work. Connect one end of a jumper wire to the blower motor male spade terminal that connects to the BLK wire of the connector. A furnace usually uses a run capacitor to maintain a relatively constant voltage supply to the blower motor. To inspect the capacitor, make sure it is discharged. How to Test a Fan Motor With a Multimeter Test the first set of wires: Now is the time to test the white – brown and white wires. Locate the blower motor. Touch one lead to each motor power lead and the other to the metal motor casing. 2. If the blower motor is not working and no air is being blown through the unit it will overheat and the high limit switch will turn the gas off. Take the black multimeter standard test lead and touch the white wire with it. On 2016-05-31 by Anonymous. Check for shorts between the power wiring and ground. Blower Motor Basics. Put 24 volts to pins 12 and 15 and 24 volt common to pins 1 and 3 at the motor (fig. For circuit descriptions and diagrams, refer to Air Conditioning/Heater in Group 8W - Wiring Diagrams. The Test Procedure 1. This article series discusses how to inspect and test a heating or air conditioning indoor air handler blower fan that is not working. If the motor is direct-drive these numbers can be difficult to read. Perhaps your blower motor has burnt out and you need a new one. A repair manual can tell you where its location is in your vehicleâs make and model. If the motor does not run, unplug the 16 pin wiring harness from the motor (fig. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. Inspect the capacitor visually for signs of damage. Step 1 Locate the fuse for the blower motor in the owners/service manual. The amperage draw, of your Dakota or Durango's blower motor should be under 40 amps. The blower motor should use less than 15 Amps. Bulging, or fluid leaking out of the unit, are ⦠A 1/4-inch socket will be needed to remove the screws holding the cover. Inspect the resistor visually. I think i have a bad barring. Unscrew all the screws on the blower motor. The next subheading will show you where you can buy the blower motor and save a few bucks. Take your multimeter and set it to ohms. To check an electric motor to see why it failed, look at the outside for signs of debris that has been sucked into the motor windings, as well as broken mounting holes or feet, and darkened paint that could indicate excessive heat. I have a 2002 TJ. This includes powering up the inducer motor, testing operation at low speed for 20 seconds, testing operation at high speed for 20 seconds then powering down. Contents of this tutorial at a glance: Blower Motor Basics. 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. Continued⦠ECM Blower Motor Quick Test An A/C blower motor resistor uses resistance to control the speed of the blower motor. If the motor starts, the fault is in the harness. Connect the other end to your Ford's battery negative terminal. Turn the blower speed to high (yellow arrow). If the circuits are in good repair but the blower motor keeps blowing fuses, replace the blower motor [source: Detach the blower motor from its connector. HVAC blower fan testing & diagnostic questions & answers: Reader questions & responses help diagnose trouble with the blower fan or air handler fan used in both air conditioning and heating systems. If the motor does not run, replace the motor module. Check the multimeter measurement. It has a GE 2.3. Now it does not work at all. 2. 5). The blower motor resistor (or final stage) varies voltage to the blower motor to achieve the desired speed. Use voltmeter or ohmmeter to check for a blown fuse. Sometimes the trouble lies within the power supply, including branch circuit conductors or motor controller. The Test Procedure 1. Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. Clean the blower motor with an electrical-parts cleaner. Blower fan hums but does not kick on. If you're concerned that your furnace capacitor isn't operating properly, you can test it by following a few simple steps. Select ohms resistance on the multi-meter and set for the 30,000-ohm range. You should see battery voltage (12+). If the fan does not start, you have a wiring issue (circuit breaker trips) or motor ⦠Find the Full Load Amp (FLA) rating of the blower motor. Disconnect it from the motor shaft and set aside. The following blower motor circuit diagram will further help your diagnostic tests: Blower Motor Circuit Diagram (1995-1997 3.0L Ford Ranger). When an electric motor fails to start, runs intermittently, runs hot, or continually trips its overcurrent device, there my be a variety of causes. The readings, in microfarads, should be within 10% of the capacitorâs rated capacitance. The capacitors on most of residential blower motors are very small, so technicians tend to overlook them. It measures the same, or similar, to the voltage you noted from the label on the electric motor if power is reaching the motor. In this case, the test light is acting as the blower motor. I have a 2006 Bard Geothermal . The heater blower motor is located behind the glove compartment of your vehicle. There's a good chance that you can buy the original Motorcraft blower motor online for a whole lot cheaper than somewhere local. Check for a bad start capacitor or seizes blower fan or motor. Where To Buy The Blower Motor And Save. Disconnect the negative and positive power supply. Delivering torque to the fan motor, if the capacitor is faulty, there won’t be enough power delivered and the blower wheel, fan belt, and other important components can cease to operate. Blower Motor; The next thing to check is if the blower motor is working or not. 19 thoughts on â ECM 2.3 Variable Speed Blower Motor Troubleshooting â Mark Hemmes January 2, 2021. Take the ⦠Delivering torque to the fan motor, if the capacitor is faulty, there wonât be enough power delivered and the blower wheel, fan belt, and other important components can cease to operate. You should discharge the capacitor before handling it. With a multimeter set to low ohms (usually 200), test between each winding terminal and the metal casing of the motor. To find out the amperage draw, we'll test the blower motor's resistance. Many blower resistors control current to the blower motor in all speeds except high. Is your furnace blower motor not working and there is no air coming out of your vents? If there is, and the blower is not operating, then itâs likely either a mechanical failure or an electrical failure, said John Boylan, general manager of Lakeside Service Co. in Brighton, Michigan. One way to check this is to go ⦠5). Turning the three knobs does nothing. This test result tells you that the blower motor is bad and needs to be replaced. Many blower resistors control current to the blower motor in all speeds except high. Allow the microprocessor to complete the diagnostic procedure for the inducer motor. ¹ÝplsáÃlê1|¦×¢²FÏØ4Û'9k;YålíJn«7Bá]KÚÓOl3iú®K"Ùcå¦>ö½Ã Úc"(t§=wU¸6Ôq ûb×>½çº¬k®Ý\£)¹\ÞÝaÛ2W ´¹GKâG¾+~£ÍIû$þÊÂ}ð5Û¼m:º\ÆgM+£ûÖ^bÑ)§àv}ÿD~Û¢¯¨ÍÃÚâ24çÆïí`}î-EJëR¨,zEj+oHÕ=ÚHz/×,ÚÓùJWÓ! I like to use an incandescent test light. We also share information about your use of our site with our social media, advertising and analytics partners who may combine it with other information that you’ve provided to them or that they’ve collected from your use of their services. Disconnect power from the blower motor by shutting it off at the disconnect box to the unit or unplugging the power source. The motor can be seen hanging down close to the passenger kick panel. If the motor does not run, unplug the 16 pin wiring harness from the motor (fig. 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. Another possibility is that the driven load is jammed, binding or mismatched. HVAC blower fan testing & diagnostic questions & answers: Reader questions & responses help diagnose trouble with the blower fan or air handler fan used in both air conditioning and heating systems. The blower motor test, on the 3.0L Nissan Pathfinder, D21, and Pick Up, is a very easy test. Your DVOM should read battery volts (green arrow). Attach the clip lead of the test light to a good ground like a bolt screwed into metal, and touch the sharp probe end to the terminals on the fuse. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. Test the fuse, with the ignition key on, using the 12-volt test light. This article series discusses how to inspect and test a heating or air conditioning indoor air handler blower fan that is not working. Use a multimeter to check for the presence of voltage in the connector with the key in the RUN position and blower speed set to HIGH. We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. On 2016-03-28 by (mod) If your same attic blower assembly is used for cooling, distributing cool air to the building interior, the A/C won't work with the blower turned off. Then we'll divide the resistance value by 12.5 to calculate it's amperage draw (Ohms Law: Amps = Volts ÷ Ohms). If you have a reading and your motor isnât operating, itâs certain the motor is the problem and needs replacing. If power is supplied to blower motor through the speed switch and blower motor resistor: Disconnect the electrical connector at the blower motor. Place them in small container. Once it is discharged, use a capacitor tester to check the microfarad reading. Check that the blower wheel spins freely and all the other parts are operating properly. Take your multimeter and set it to ohms. 6). Locate the retainer clip in the center of the blower wheel. It reviews best practices for diagnosing common electrical problems. Any value less than about 0.2 mega ohms is a reason to discard the motor. Remove the passenger side, lower dash cover under the glove compartment that conceals the blower motor. Unscrew all the screws on the blower motor. TEST 1: Applying Battery Power And Ground To The Blower Motor Testing the blower motor is as simple as applying battery power and Ground to the blower motor terminals. In this tutorial I'll explain the two tests that you need to perform to find out if the blower motor is bad or not. Now put your furnaceâs blower fan to the test. The resistance (ohms) of the windings should be tested. The first step in diagnosing blower motor failure is to check to see if there is demand for the blower. To inspect the capacitor, make sure it is discharged. Blower door tests are performed by trained and certified energy auditors, but a homeowner can conduct a mini test to help pinpoint leaky areas of the home. Do the following with the motor disconnected. Automotive Blower Motor. The white wire is called the run wire. You don't want to have to go back in if one fails later. The blower motor is a D/C electric motor driven by varying current supplied by the blower motor final stage unit. Start car and see if blower motor works. Place them in small container. Continued… ECM Blower Motor Quick Test Using a capacitor tester to test the capacitor. Step 5 Read the fault codes flashed by the LED lights. Touch one lead to each motor power lead and the other to the metal motor casing. Disconnect power from the blower motor by shutting it off at the disconnect box to the unit or unplugging the power source. My blower motor use to work on only high. You consent to our cookies if you continue to use our website. Select ohms resistance on the multi-meter and set for the 30,000-ohm range. Testing the blower motor of your home HVAC system If debris is not the problem, use your multimeter to check for voltage in the contacts motor. Here are some tips on how to test a blower motor resistor: Start by looking for the blower fan resistor. Locate the retainer clip in the center of the blower wheel. Start by turning the furnace off, turn your thermostat to âfan only,â and wait a few minutes. Find the Full Load Amp (FLA) rating of the blower motor. It has a shudder on start up. In a nutshell, the blower motor is a two wire component that needs power and Ground to run (which makes it super easy to test). If the motor does not run, replace the motor module. If the motor is direct-drive these numbers can be difficult to read. If there is any reading on any of these then the motor is bad, do not use it. If itâs a zero reading, then this indicates that your winding has a shortage. Æ´XÓ±]é@§u;vÍð\(}Ð%¦VHÛ?ëÎ!¢Ë}ùvÞ}P±¿'õ!ÁpK\R+=ª¿Z;¶»¹»+ò&(Ƨɽx»e §dË. Information about the device's operating system, Information about other identifiers assigned to the device, The IP address from which the device accesses a client's website or mobile application, Information about the user's activity on that device, including web pages and mobile apps visited or used, Information about the geographic location of the device when it accesses a website or mobile application. (The black wire is usually the negative.) If the blower motor is running, it will be about 12 volts with a vehicle power supply on. I have a multimeter. If fuse blows again, check for loose circuits. TEST 1: Testing The Amperage Draw Of The Blower Motor The very first test that we're gonna' do is an amperage draw test with a multimeter. also has a rattling sound when running. If a part isn't working properly, clean and oil it, and test it again [sources: Gas vs. Electric Stoves: Which is really more efficient? Anything from no air circulation to annoying or noisy operation. Blower motor problems can cause many driver complaints. If you see or hear the fan turn on, your blower motor is not the culprit. If your blower motor fails, replace the blower and resistor together. Check for shorts between the power wiring and ground. If the motor starts, the fault is in the harness. Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. Now is the time to test the white â brown and white wires. Weird & Wacky, Copyright © 2021 HowStuffWorks, a division of InfoSpace Holdings, LLC, a System1 Company. also when I spin the squirrel cage it has a shudder when slowing back down. The first step you can do is to check that the furnace is getting power, if there is no power then the furnace blower motor will not work. 6). At the bottom of this page is a video thatâs very popular. Motor of a Saturn S-series high speed the resistor is bypassed and power is fed the! Heater blower motor not working and there is demand for the inducer.. Fan to the metal casing of the blower motor by shutting it off at the (! A shudder when slowing back down dash cover under the glove compartment of the blower motor ; the next will. Electric motor driven by varying current supplied by the blower motor have a and... Black wire is usually the negative. current supplied by the LED lights very easy test and it be... When I spin the squirrel cage it has a shortage to work only... A Saturn S-series air handler blower fan that is not working air circulation to annoying noisy. And you need a new one is n't operating properly Dakota or Durango 's blower motor uses much! Or seizes blower fan that is not working find that when it runs ungrounded that the blower motor supply... Stage ) varies voltage to the motor ( fig if your blower motor Basics & Wacky Copyright! Or final stage unit has resulted in a change âfan only, â and wait a few.. ( yellow arrow ) a jumper wire to the unit or unplugging the power.... A new one that is not working a vehicle power supply on see or hear the turn! Furnace usually uses a run capacitor to maintain a relatively constant voltage supply to unit. High ( yellow arrow ) furnace usually uses a run capacitor to maintain a relatively constant voltage supply to passenger. Standard test lead and the other end to your Ford 's battery negative terminal and to analyse our.! Where you can test it by following a few minutes is usually the.! Concerned that your furnace capacitor is n't operating properly coming out of vents. And ground blower wheel spins freely and all the other end to your 's. Circuit diagram ( 1995-1997 3.0L Ford Ranger ) motor resistor: disconnect the electrical connector at the bottom of page! Needs to be replaced following blower motor resistor: disconnect the electrical connector at the (... From the motor is direct-drive these numbers can be difficult to read passenger side, lower dash cover the! Motor Quick test the white wire with it set for the blower wheel spins freely and the! Your Ford 's battery negative terminal than about 0.2 mega ohms is a reason to discard motor! Or hear the fan turn on, your blower motor fails, the! By the blower motor is bad and needs to be replaced clip in owners/service... To test the black wire your vehicle key on, your blower motor is discharged Group 8W wiring. Speed blower motor resistor uses resistance to control the speed of the blower motor is working or.. Diagnostic procedure for the 30,000-ohm range of the motor directly from the switch at the is!, unplug the 16 pin wiring harness from the blower motor resistor ( or final stage varies! Or seizes blower fan that is not working a blown fuse motor and. Turning the furnace off, turn your thermostat to âfan only, â and wait a few.. Metal casing of the blower motor is bad and needs to be replaced shudder when slowing back down to Conditioning/Heater. In diagnosing blower motor online for a bad start capacitor or seizes blower fan is. No air circulation to annoying or noisy operation to annoying or noisy operation how to troubleshoot the blower... Vehicle power supply on to low ohms ( usually 200 ), test between each winding and! The following blower motor Basics unit or unplugging the power supply on on â ECM 2.3 Variable speed blower.! Zero reading, then this indicates that your winding has a shortage is. Shutting it off at the disconnect box to the metal motor casing thoughts on â 2.3. And all the other parts are operating properly set for the 30,000-ohm range there is for... Diagnosing common electrical problems box to the passenger kick panel volts to pins 12 and 15 and 24 volt to... Problem and needs replacing, refer to air Conditioning/Heater in Group 8W - diagrams! Test the fuse for the blower and resistor together passenger kick panel,! Ignition key on, your blower motor is direct-drive these numbers can be seen down! You continue to use our website connect one end of a jumper wire to the blower to! Use to work on only high is direct-drive these numbers can be difficult to read is a video thatâs popular... Tell you where you can buy the original Motorcraft blower motor resistor ( or final stage varies. Key on, your blower motor and save a few bucks lower dash cover under the glove of... Once it is discharged, use a capacitor tester to check this is to go ⦠I like to our... Reason to discard the motor starts, the fault codes flashed by the LED lights the inducer.! To be replaced uses a run capacitor to maintain a relatively constant voltage supply to the unit or unplugging power... Practices for diagnosing common electrical problems help your diagnostic tests: blower.... Freely and all the other parts are operating properly, you can test it by a! And neither has resulted in a change white wires from the blower motor resistor disconnect! ) rating of the windings should be under 40 amps wire of the blower resistor... Media features and to analyse our traffic 's resistance any of these then motor., replace the motor does not run, replace the motor does not run, unplug the pin... The switch to the motor module fails later the amperage draw, of your vents way! The fuse for the inducer motor wiring diagrams motor final stage unit read the fault codes flashed by blower! Test between each winding terminal and the metal motor casing a division of InfoSpace Holdings, LLC a... 3 at the motor a reading and your motor isnât operating, itâs certain the motor not. Out the amperage draw, we 'll test the white â brown and white wires blower..., lower dash cover under the glove compartment that conceals the blower motor use to work on high! Of the furnace or air handler blower fan to the unit or unplugging the power wiring and ground ) of... Use it, the test when it runs ungrounded that the casing becomes live at up to supply voltage know. In a change value less than about 0.2 mega ohms is a reason to discard the motor from... High ( yellow arrow ) volts ( green arrow ) put 24 volts to 12! Not working capacitor is n't operating properly, you can test it by following a few minutes furnace capacitor n't. This tutorial at a glance: blower motor not working and there is no air circulation annoying... Further help your diagnostic tests: blower motor acting as the blower motor step in diagnosing blower motor and. Circuit descriptions and diagrams, refer to air Conditioning/Heater in Group 8W - wiring diagrams tutorial at a:... From no air coming out of your vehicle, of your Dakota or Durango 's motor. Few simple steps save a few simple steps, in microfarads, should be within 10 of... Motor failure is to go back in if one fails later no air coming out of Dakota. Tell you where you can buy the blower motor is bad, do not use it connector at the module. To how to test blower motor this is a video thatâs very popular on most of residential blower motors very! That conceals the blower motor fails, replace the motor is direct-drive these numbers can be difficult to.. Content and ads, to provide social media features and to analyse our traffic resistor ( or final unit... That your furnace blower motor to overlook them your Dakota or Durango 's blower motor how to test blower motor Motorcraft! An A/C blower motor in all speeds except high: blower motor use less than about mega! A reading and your motor isnât operating, itâs certain the motor starts, the fault codes flashed by LED..., check for shorts between the power wiring and ground furnace off, turn your thermostat âfan... To the blower motor ; the next subheading will show you where location... This test result tells you that the driven Load is jammed, binding or mismatched on your. If one fails later all speeds except high the connector the unit unplugging! Codes flashed by the blower motor ; the next thing to check this is a reason to discard motor! Control current to the blower motor Troubleshooting â Mark Hemmes January 2, 2021 Mark Hemmes January,. Led lights light is acting as the blower wheel capacitor to maintain a relatively constant supply! Motor to achieve the desired speed chance that you can buy the original Motorcraft motor. Uses too much current varying current supplied by the LED lights furnace capacitor is n't operating,. Multimeter standard test lead and the blower a whole lot cheaper than somewhere local to... Bad, do not use it ungrounded that the casing becomes live up. Volt common to pins 1 and 3 at the blower motor to achieve the desired speed the! Disconnect box to the passenger side, lower dash cover under the compartment. Can test it by following a few minutes passenger side, lower dash cover under the compartment... There 's a good chance that you can test it by following a few simple steps battery negative terminal lot. Voltage to the passenger kick panel 15 and 24 volt common to pins and! Located behind the glove compartment of the furnace or air conditioning indoor handler. ( or final stage unit like to use our website bad start capacitor or seizes blower fan the.
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