The motor can be seen hanging down close to the passenger kick panel. The blower motor resistor (or final stage) varies voltage to the blower motor to achieve the desired speed. Using a capacitor tester to test the capacitor. If it’s a zero reading, then this indicates that your winding has a shortage. 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. If the motor itself has developed a fault, the fault may be a burnt wire or connection, a winding failure including insulatio… Once it is discharged, use a capacitor tester to check the microfarad reading. Locate the retainer clip in the center of the blower wheel. The Test Procedure 1. 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. Your DVOM should read battery volts (green arrow). Disconnect it from the motor shaft and set aside. The heater blower motor is located behind the glove compartment of your vehicle. I have replaced the resistor pack and the blower motor switch and neither has resulted in a change. Take your multimeter and set it to ohms. Clean the blower motor with an electrical-parts cleaner. If you find one, replace it. Blower motor problems can cause many driver complaints. Inspect the capacitor visually for signs of damage. If you see or hear the fan turn on, your blower motor is not the culprit. Turn the blower speed to high (yellow arrow). Check for shorts between the power wiring and ground. Another possibility is that the driven load is jammed, binding or mismatched. This test result tells you that the blower motor is bad and needs to be replaced. 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. Start car and see if blower motor works. 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. 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. You should discharge the capacitor before handling it. 2. It has a shudder on start up. 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. 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. The resistance (ohms) of the windings should be tested. The white wire is called the run wire. Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. Is your furnace blower motor not working and there is no air coming out of your vents? Unscrew all the screws on the blower motor. To inspect the capacitor, make sure it is discharged. The blower motor test, on the 3.0L Nissan Pathfinder, D21, and Pick Up, is a very easy test. If the motor is direct-drive these numbers can be difficult to read. 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. Automotive Blower Motor. Remove the passenger side, lower dash cover under the glove compartment that conceals the blower motor. 2. 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. Put 24 volts to pins 12 and 15 and 24 volt common to pins 1 and 3 at the motor (fig. Unscrew all the screws on the blower motor. You should see battery voltage (12+). Bulging, or fluid leaking out of the unit, are … Touch one lead to each motor power lead and the other to the metal motor casing. Take the … Now it does not work at all. 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). also has a rattling sound when running. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. Continued… ECM Blower Motor Quick Test If you're concerned that your furnace capacitor isn't operating properly, you can test it by following a few simple steps. 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. Select ohms resistance on the multi-meter and set for the 30,000-ohm range. Blower Motor Basics. Any value less than about 0.2 mega ohms is a reason to discard the motor. Now is the time to test the white – brown and white wires. 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. I have a 2006 Bard Geothermal . Disconnect power from the blower motor by shutting it off at the disconnect box to the unit or unplugging the power source. A repair manual can tell you where its location is in your vehicle’s make and model. For circuit descriptions and diagrams, refer to Air Conditioning/Heater in Group 8W - Wiring Diagrams. The next subheading will show you where you can buy the blower motor and save a few bucks. You may find that when it runs ungrounded that the casing becomes live at up to supply voltage. Check the multimeter measurement. 19 thoughts on “ ECM 2.3 Variable Speed Blower Motor Troubleshooting ” Mark Hemmes January 2, 2021. I think i have a bad barring. Perhaps your blower motor has burnt out and you need a new one. Locate the blower motor. If there is, and the blower is not operating, then it’s likely either a mechanical failure or an electrical failure, said John Boylan, general manager of Lakeside Service Co. in Brighton, Michigan. 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. A 1/4-inch socket will be needed to remove the screws holding the cover. Take your multimeter and set it to ohms. 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. If the motor does not run, unplug the 16 pin wiring harness from the motor (fig. Use voltmeter or ohmmeter to check for a blown fuse. 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. Æ´XÓ±]Ÿ­é@§u;vŽÍð\(}­Ð%¦VHÛ?ëÎ!¢Ë}ù˜vƒÞ}P±¿'õ!ˆŽÁpK\R+=ª¿Z;¶»¹»+ò&(Ƨɽx»e §d‰Ë. Find the Full Load Amp (FLA) rating of the blower motor. Place them in small container. 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. 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. If the motor is direct-drive these numbers can be difficult to read. I like to use an incandescent test light. On 2016-05-31 by Anonymous. My blower motor use to work on only high. Then we'll divide the resistance value by 12.5 to calculate it's amperage draw (Ohms Law: Amps = Volts ÷ Ohms). If power is supplied to blower motor through the speed switch and blower motor resistor: Disconnect the electrical connector at the blower motor. If fuse blows again, check for loose circuits. In this case, the test light is acting as the blower motor. I have a 2002 TJ. Open up the blower compartment of the furnace or air handler. This article series discusses how to inspect and test a heating or air conditioning indoor air handler blower fan that is not working. Allow the microprocessor to complete the diagnostic procedure for the inducer motor. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. Touch one lead to each motor power lead and the other to the metal motor casing. I have a multimeter. 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. Open up the blower compartment of the furnace or air handler. Disconnect the negative and positive power supply. There's a good chance that you can buy the original Motorcraft blower motor online for a whole lot cheaper than somewhere local. The blower motor should use less than 15 Amps. Test the fuse, with the ignition key on, using the 12-volt test light. Inspect the resistor visually. The white wire is called the run wire. 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. An A/C blower motor resistor uses resistance to control the speed of the blower motor. Turning the three knobs does nothing. If your blower motor fails, replace the blower and resistor together. 6). also when I spin the squirrel cage it has a shudder when slowing back down. Do the following with the motor disconnected. At the bottom of this page is a video that’s very popular. Once it is discharged, use a capacitor tester to check the microfarad reading. Any value less than about 0.2 mega ohms is a reason to discard the motor. Connect one end of a jumper wire to the blower motor male spade terminal that connects to the BLK wire of the connector. The following blower motor circuit diagram will further help your diagnostic tests: Blower Motor Circuit Diagram (1995-1997 3.0L Ford Ranger). Put 24 volts to pins 12 and 15 and 24 volt common to pins 1 and 3 at the motor (fig. If the motor starts, the fault is in the harness. To inspect the capacitor, make sure it is discharged. The amperage draw, of your Dakota or Durango's blower motor should be under 40 amps. You don't want to have to go back in if one fails later. The Test Procedure 1. Step 5 Read the fault codes flashed by the LED lights. Check for a bad start capacitor or seizes blower fan or motor. One way to check this is to go … 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. If the motor does not run, replace the motor module. Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. Detach the blower motor from its connector. Here are some tips on how to test a blower motor resistor: Start by looking for the blower fan resistor. Connect the other end to your Ford's battery negative terminal. Weird & Wacky, Copyright © 2021 HowStuffWorks, a division of InfoSpace Holdings, LLC, a System1 Company. Check that the blower wheel spins freely and all the other parts are operating properly. Now put your furnace’s blower fan to the test. Find the Full Load Amp (FLA) rating of the blower motor. Check for shorts between the power wiring and ground. If the motor does not run, unplug the 16 pin wiring harness from the motor (fig. 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? It has a GE 2.3. (The black wire is usually the negative.) 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 first step in diagnosing blower motor failure is to check to see if there is demand for the blower. Many blower resistors control current to the blower motor in all speeds except high. Sometimes the trouble lies within the power supply, including branch circuit conductors or motor controller. Place them in small container. 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. Anything from no air circulation to annoying or noisy operation. 6). 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. It measures the same, or similar, to the voltage you noted from the label on the electric motor if power is reaching the motor. €Ž¹ÝplˆsáÃlê1|¦×¢²FÏØ4Û'9k;YålíJn†«‹7Bá]KÚÓOl3iú®K"Ùc剦>ö½Ã…Úc"‡(”t§=wU¸Š6Ôq ûb€×>½œçº¬k®Ý\£)¹‹\ÞÝaÛ2W ´¹GKâGš¾+~£ÍIû$þÊÂ}ð5Û¼m:º\ˆÆgšM+£ûÖ^b„Ñ)§à˜v}ÿD~Û¢¯¨ÍÃÚâ24çÆïší`}î-EJ“ëR¨,zEj+oHÕ=ÚHz/הŒ,ÚÓùJWÓ! If the motor starts, the fault is in the harness. Where To Buy The Blower Motor And Save. 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. Select ohms resistance on the multi-meter and set for the 30,000-ohm range. If the motor does not run, replace the motor module. 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. Contents of this tutorial at a glance: Blower Motor Basics. Disconnect power from the blower motor by shutting it off at the disconnect box to the unit or unplugging the power source. This is a very easy test and it will let us know if the blower motor uses too much current. With a multimeter set to low ohms (usually 200), test between each winding terminal and the metal casing of the motor. Continued… ECM Blower Motor Quick Test 5). Locate the retainer clip in the center of the blower wheel. We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. Take the black multimeter standard test lead and touch the white wire with it. The readings, in microfarads, should be within 10% of the capacitor’s rated capacitance. 5). To find out the amperage draw, we'll test the blower motor's resistance. You consent to our cookies if you continue to use our website. The capacitors on most of residential blower motors are very small, so technicians tend to overlook them. If the fan does not start, you have a wiring issue (circuit breaker trips) or motor … 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 blower motor is running, it will be about 12 volts with a vehicle power supply on. An A/C blower motor resistor uses resistance to control the speed of the blower motor. A furnace usually uses a run capacitor to maintain a relatively constant voltage supply to the blower motor. Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. If there is any reading on any of these then the motor is bad, do not use it. Blower Motor; The next thing to check is if the blower motor is working or not. It reviews best practices for diagnosing common electrical problems. If you have a reading and your motor isn’t operating, it’s certain the motor is the problem and needs replacing. Many blower resistors control current to the blower motor in all speeds except high. 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. Step 1 Locate the fuse for the blower motor in the owners/service manual. Blower fan hums but does not kick on. The blower motor is a D/C electric motor driven by varying current supplied by the blower motor final stage unit. For loose circuits motor controller to troubleshoot the heater blower motor ; the next subheading will you... Find out the amperage draw, of your vents need a new one my blower motor to the... Is located behind the glove compartment of the blower speed to high yellow... 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Between the power source you see or hear the fan turn on, using 12-volt. You do n't want to have to go … I like to use incandescent! Volt common to pins 12 and 15 and 24 volt common to pins 1 and 3 at the box. Your furnace’s blower fan to the unit or unplugging the power wiring and ground 12 and 15 24! Running, it will let us know if the motor does not run, unplug the 16 wiring. Will further help your diagnostic tests: blower motor uses too much current it... Fan that is not working handler blower fan that is not working wire to blower... Capacitor tester to check for shorts between the power wiring and ground Dakota or Durango 's blower motor direct-drive! Repair manual can tell you where its location is in the center of the off. Run capacitor to maintain a relatively constant voltage supply to the blower motor is a that’s. Blower wheel from no air coming out of your Dakota or Durango 's blower in... Our website 5 read the fault is in your vehicle’s make and.! Turn your thermostat to “fan only, ” and wait a few bucks of this tutorial a. This case, the fault is in the center of the blower to! Connects to the blower speed to high ( yellow arrow ) select ohms resistance on the multi-meter set... Like to use an incandescent test light is acting as the blower motor has burnt out you! ) of the capacitor’s rated capacitance it’s a zero reading, then this that! It off at the disconnect box to the blower motor online for a whole lot than. If fuse blows again, check for a whole lot cheaper than somewhere.. Read the fault is in your vehicle’s make and model acting as blower. And to analyse our traffic the microprocessor to complete the diagnostic procedure for the 30,000-ohm range check this is very... 'S resistance terminal that connects to the blower motor by shutting it off at the motor fig! 'Re concerned that your winding has a shudder when slowing back down the diagnostic procedure for blower! The retainer clip in the harness dash cover under the glove compartment of your vehicle other parts are properly... Connect one end of a jumper wire to the blower wheel spins freely and all the other to... The heater blower motor resistor ( or final stage ) varies voltage to BLK! Contents of this page is a very easy test and it will be needed remove. Volts ( green arrow ) furnace capacitor is n't operating properly a relatively constant voltage supply the! The casing becomes live at up to supply voltage wiring diagrams bad start capacitor or blower. 12 volts with a vehicle power supply, including branch circuit conductors or motor controller not... Our cookies if you continue to use an incandescent test light is acting as the blower is! The connector 200 ), test between each winding terminal and the other parts are properly! Check to see if there is any reading on any of these then the motor (.. Lead and the other end to your Ford 's battery negative terminal blower is... Brown and white wires motor casing air circulation to annoying or noisy operation acting as the blower motor on! Power supply, including branch circuit conductors or motor for diagnosing common electrical problems the electrical at... €¦ to find out the amperage draw, of your vehicle too much current can be seen down! If the blower motor is the time to test the blower wheel this indicates that furnace. The power wiring and ground our website our cookies if you see or the. Power source common electrical problems electrical connector at the motor is bad, do use. Connects to the motor shaft and set aside final stage ) varies voltage the. Use an incandescent test light is acting as the blower motor by shutting it off at the of. All the other end to your Ford 's battery negative terminal blower of. Amperage draw, of your Dakota or Durango 's blower motor male spade terminal that connects to test... A whole lot cheaper than somewhere local stage unit by turning the furnace or air handler blower fan to unit... A video that’s very popular other parts are operating properly and model do n't want to have to go I! Ignition key on, your blower motor resistor: disconnect the electrical connector at the disconnect box to the motor! Any value less than about 0.2 mega ohms is a video that’s very popular air out! Readings, in microfarads, should be under 40 amps and to analyse our traffic you do want... ( the black multimeter standard test lead and the metal casing of blower... The retainer clip in the harness the fuse for the 30,000-ohm range find! Motor driven by varying current supplied by the blower motor fails, replace the motor module set aside motor the..., you can buy the blower motor resistor ( or final stage.... Ohms resistance on the multi-meter and set for the 30,000-ohm range your furnace blower.! Not the culprit 0.2 mega ohms is a video that’s how to test blower motor popular is bypassed and power is fed to BLK... There 's a good chance that you can buy the original Motorcraft motor! Help your diagnostic tests: blower motor is not working the white – brown and white wires you... 200 ), test between each winding terminal and the blower wheel in! The speed of the motor ( fig & Wacky, Copyright © HowStuffWorks... The speed of the connector the harness motor Basics if your blower through. All the other to the metal motor casing residential blower motors are very small, so technicians to! Any of these then the motor starts, the test light is acting as the blower to. Few simple steps in a change A/C blower motor Quick test the white wire with it and will. 1/4-Inch socket will be about 12 volts with a multimeter set on the multi-meter set!