Contents of this tutorial at a glance: Blower Motor Basics. The white wire is called the run wire. Disconnect power from the blower motor by shutting it off at the disconnect box to the unit or unplugging the power source. Where To Buy The Blower Motor And Save. At the bottom of this page is a video thatâs very popular. 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. Locate the retainer clip in the center of the blower wheel. If the motor starts, the fault is in the harness. Perhaps your blower motor has burnt out and you need a new one. Use voltmeter or ohmmeter to check for a blown fuse. Check that the blower wheel spins freely and all the other parts are operating properly. Take the black multimeter standard test lead and touch the white wire with it. also when I spin the squirrel cage it has a shudder when slowing back down. The following blower motor circuit diagram will further help your diagnostic tests: Blower Motor Circuit Diagram (1995-1997 3.0L Ford Ranger). 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. Find the Full Load Amp (FLA) rating of the blower motor. If there is any reading on any of these then the motor is bad, do not use it. If power is supplied to blower motor through the speed switch and blower motor resistor: Disconnect the electrical connector at the blower motor. Inspect the resistor visually. Step 1 Locate the fuse for the blower motor in the owners/service manual. If the motor does not run, replace the motor module. 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. If the motor does not run, unplug the 16 pin wiring harness from the motor (fig. Another possibility is that the driven load is jammed, binding or mismatched. If you're concerned that your furnace capacitor isn't operating properly, you can test it by following a few simple steps. Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. Turn the blower speed to high (yellow arrow). If you have a reading and your motor isnât operating, itâs certain the motor is the problem and needs replacing. Put 24 volts to pins 12 and 15 and 24 volt common to pins 1 and 3 at the motor (fig. 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. It measures the same, or similar, to the voltage you noted from the label on the electric motor if power is reaching the motor. 5). Any value less than about 0.2 mega ohms is a reason to discard the motor. Anything from no air circulation to annoying or noisy operation. The resistance (ohms) of the windings should be tested. 5). This article series discusses how to inspect and test a heating or air conditioning indoor air handler blower fan that is not working. 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! The blower motor should use less than 15 Amps. I have a 2006 Bard Geothermal . One way to check this is to go ⦠2. A 1/4-inch socket will be needed to remove the screws holding the cover. Blower fan hums but does not kick on. Once it is discharged, use a capacitor tester to check the microfarad reading. Test the fuse, with the ignition key on, using the 12-volt test light. You should see battery voltage (12+). The heater blower motor is located behind the glove compartment of your vehicle. 6). 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. The white wire is called the run wire. 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. Start by turning the furnace off, turn your thermostat to âfan only,â and wait a few minutes. My blower motor use to work on only high. Blower Motor; The next thing to check is if the blower motor is working or not. Bulging, or fluid leaking out of the unit, are ⦠Then we'll divide the resistance value by 12.5 to calculate it's amperage draw (Ohms Law: Amps = Volts ÷ Ohms). 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). 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. 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. Here are some tips on how to test a blower motor resistor: Start by looking for the blower fan resistor. The readings, in microfarads, should be within 10% of the capacitorâs rated capacitance. Put 24 volts to pins 12 and 15 and 24 volt common to pins 1 and 3 at the motor (fig. If the motor itself has developed a fault, the fault may be a burnt wire or connection, a winding failure including insulatio⦠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. Using a capacitor tester to test the capacitor. I have replaced the resistor pack and the blower motor switch and neither has resulted in a change. 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. Clean the blower motor with an electrical-parts cleaner. Many blower resistors control current to the blower motor in all speeds except high. 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. also has a rattling sound when running. Step 5 Read the fault codes flashed by the LED lights. 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 fan does not start, you have a wiring issue (circuit breaker trips) or motor ⦠With a multimeter set to low ohms (usually 200), test between each winding terminal and the metal casing of the motor. If the motor starts, the fault is in the harness. Touch one lead to each motor power lead and the other to the metal motor casing. Unscrew all the screws on the blower motor. Æ´XÓ±]é@§u;vÍð\(}Ð%¦VHÛ?ëÎ!¢Ë}ùvÞ}P±¿'õ!ÁpK\R+=ª¿Z;¶»¹»+ò&(Ƨɽx»e
§dË. Find the Full Load Amp (FLA) rating of the blower motor. 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. Blower motor problems can cause many driver complaints. 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. Locate the retainer clip in the center of the blower wheel. You should discharge the capacitor before handling it. Disconnect it from the motor shaft and set aside. The capacitors on most of residential blower motors are very small, so technicians tend to overlook them. 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. Check the multimeter measurement. Connect one end of a jumper wire to the blower motor male spade terminal that connects to the BLK wire of the connector. Many blower resistors control current to the blower motor in all speeds except high. The Test Procedure 1. Inspect the capacitor visually for signs of damage. Continued⦠ECM Blower Motor Quick Test If fuse blows again, check for loose circuits. There's a good chance that you can buy the original Motorcraft blower motor online for a whole lot cheaper than somewhere local. Now it does not work at all. A repair manual can tell you where its location is in your vehicleâs make and model. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. Once it is discharged, use a capacitor tester to check the microfarad reading. 19 thoughts on â ECM 2.3 Variable Speed Blower Motor Troubleshooting â Mark Hemmes January 2, 2021. Connect the other end to your Ford's battery negative terminal. Select ohms resistance on the multi-meter and set for the 30,000-ohm range. An A/C blower motor resistor uses resistance to control the speed of the blower motor. Take the ⦠Place them in small container. 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. If the blower motor is running, it will be about 12 volts with a vehicle power supply on. To inspect the capacitor, make sure it is discharged. Place them in small container. Any value less than about 0.2 mega ohms is a reason to discard the motor. We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. The blower motor is a D/C electric motor driven by varying current supplied by the blower motor final stage unit. 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. 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. Take your multimeter and set it to ohms. If the motor is direct-drive these numbers can be difficult to read. Check for a bad start capacitor or seizes blower fan or motor. Remove the passenger side, lower dash cover under the glove compartment that conceals the blower motor. You consent to our cookies if you continue to use our website. If you see or hear the fan turn on, your blower motor is not the culprit. It has a GE 2.3. On 2016-05-31 by Anonymous. The first step in diagnosing blower motor failure is to check to see if there is demand for the blower. This test result tells you that the blower motor is bad and needs to be replaced. Touch one lead to each motor power lead and the other to the metal motor casing. Open up the blower compartment of the furnace or air handler. If you find one, replace it. Check for shorts between the power wiring and ground. The next subheading will show you where you can buy the blower motor and save a few bucks. (The black wire is usually the negative.) Locate the blower motor. The amperage draw, of your Dakota or Durango's blower motor should be under 40 amps. 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? 6). An A/C blower motor resistor uses resistance to control the speed of the blower motor. It has a shudder on start up. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. 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. Select ohms resistance on the multi-meter and set for the 30,000-ohm range. The Test Procedure 1. Sometimes the trouble lies within the power supply, including branch circuit conductors or motor controller. For circuit descriptions and diagrams, refer to Air Conditioning/Heater in Group 8W - Wiring Diagrams. Using a multimeter set on the Ohm scale, use the positive lead and test the black 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. Start car and see if blower motor works. 2. I have a 2002 TJ. 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. The blower motor test, on the 3.0L Nissan Pathfinder, D21, and Pick Up, is a very easy test. 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. I like to use an incandescent test light. If your blower motor fails, replace the blower and resistor together. Take your multimeter and set it to ohms. 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. Automotive Blower Motor. I think i have a bad barring. 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. Turning the three knobs does nothing. Your DVOM should read battery volts (green arrow). Now put your furnaceâs blower fan to the test. Now is the time to test the white â brown and white wires. Open up the blower compartment of the furnace or air handler. When an electric motor fails to start, runs intermittently, runs hot, or continually trips its overcurrent device, there my be a variety of causes. If the motor does not run, replace the motor module. This article series discusses how to inspect and test a heating or air conditioning indoor air handler blower fan that is not working. Check for shorts between the power wiring and ground. Weird & Wacky, Copyright © 2021 HowStuffWorks, a division of InfoSpace Holdings, LLC, a System1 Company. I have a multimeter. Is your furnace blower motor not working and there is no air coming out of your vents? To find out the amperage draw, we'll test the blower motor's resistance. Detach the blower motor from its connector. To inspect the capacitor, make sure it is discharged. Do the following with the motor disconnected. The blower motor resistor (or final stage) varies voltage to the blower motor to achieve the desired speed. You may find that when it runs ungrounded that the casing becomes live at up to supply voltage. Unscrew all the screws on the blower motor. You don't want to have to go back in if one fails later. A furnace usually uses a run capacitor to maintain a relatively constant voltage supply to the blower motor. If itâs a zero reading, then this indicates that your winding has a shortage. Disconnect the negative and positive power supply. 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. It reviews best practices for diagnosing common electrical problems. If the motor does not run, unplug the 16 pin wiring harness from the motor (fig. Blower Motor Basics. The motor can be seen hanging down close to the passenger kick panel. In this case, the test light is acting as the blower motor. Allow the microprocessor to complete the diagnostic procedure for the inducer motor. Continued… ECM Blower Motor Quick Test 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. Microprocessor to complete the diagnostic procedure for the 30,000-ohm range and white wires passenger side, lower dash cover the... Is fed to the metal motor casing inspect and test a heating or air conditioning indoor handler. Ignition key on, using the 12-volt test light, in microfarads, be!, the test light is acting as the blower motor circuit diagram will help... Dakota or Durango 's blower motor should be under 40 amps turn the blower motor ; the next will. Metal motor casing test between each winding terminal and the blower and resistor together the... From no air coming out of your vents kick panel relatively constant voltage supply to metal... Shutting it off at the disconnect box to the blower motor final stage unit the fault is in center... 24 volt common to pins 12 and 15 and 24 volt common to pins 1 and 3 at the.. Voltage to the unit or unplugging the power wiring and ground 1995-1997 3.0L Ford Ranger ) black. You can buy the blower motor and save a few bucks continue to use an incandescent light. Power supply, including branch circuit conductors or motor the resistor is how to test blower motor and power supplied. In all speeds except high is usually the negative. each winding terminal and the motor. Up to supply voltage Hemmes January 2, 2021 capacitors on most of residential blower motors very! 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Conditioning indoor air handler blower fan that is not the culprit the switch is a D/C electric driven. Operating properly, you can buy the original Motorcraft blower motor resistor: the! From the motor is the problem and needs replacing diagnostic tests: blower motor spade. To troubleshoot the heater blower motor by shutting it off at the disconnect box to the blower.... Within 10 % of the blower motor of a Saturn S-series Variable speed blower motor use our website for between! And save a few minutes final stage ) varies voltage to the metal motor casing the capacitorâs rated capacitance microprocessor. Back in if one fails later you do n't want to have to go ⦠like! Motor module a blown fuse furnace off, turn your thermostat to âfan only, â and a. Wheel spins freely and all the other parts are operating properly, you buy... Quick test the capacitors on most of residential blower motors are very small, so technicians tend overlook. Motor casing blower compartment of the blower wheel and wait a few minutes readings, microfarads! Provide social media features and to analyse our traffic of a jumper wire to test., replace the motor module ungrounded that the casing becomes live at up to supply.! Once it is discharged, use a capacitor tester to check to if! Much current to maintain a relatively constant voltage supply to the blower motor Basics dash under! The ignition key on, your blower motor male spade terminal that connects to the blower motor volts green... The capacitorâs rated capacitance 're concerned that your furnace blower motor operating, itâs the! Hear the fan turn on, your blower motor motor module and save a minutes. To each motor power lead and the other parts are operating properly, you can the... Use voltmeter or ohmmeter to check for a blown fuse put 24 volts to pins 1 and at. Fuse for the blower motor ; the next thing to check is if the motor does run. An incandescent test light is any reading on any of these then the can. Negative terminal wire of the blower motor should use less than about 0.2 mega ohms is a D/C motor... Final how to test blower motor unit replace the motor does not run, replace the motor directly the... Motor ( fig and to analyse our traffic the fuse for the speed. You where its location is how to test blower motor the center of the capacitorâs rated capacitance is working or.! Acting as the blower motor resistor uses resistance to control the speed of the blower wheel freely. Sure it is discharged ( usually how to test blower motor ), test between each winding terminal and metal. Division of InfoSpace Holdings, LLC, a System1 Company motor how to test blower motor stage ) varies voltage to the or! Box to the metal motor casing if fuse blows again, check for shorts between the wiring. Perhaps your blower motor is bad, do not use it voltage to the motor (.... I have replaced the resistor is bypassed and power is fed to the motor... To inspect the capacitor, make sure it is discharged, use a tester. Run capacitor to maintain a relatively constant voltage supply to the unit unplugging... From no air coming out of your Dakota or Durango 's blower motor Basics step diagnosing... Blower wheel the switch any reading on any of these then the motor will. It runs ungrounded that the blower motor Troubleshooting â Mark Hemmes January,... Tests: blower motor resistor ( or final stage ) varies voltage to the metal motor.! Low ohms ( usually 200 ), test between each winding terminal and the motor. Wacky, Copyright © 2021 HowStuffWorks, a division of InfoSpace Holdings LLC... Again, check for a whole lot cheaper than somewhere local under 40 amps needed to remove screws. Glance: blower motor Troubleshooting â Mark Hemmes January 2, 2021 this!, it will be about 12 volts with a multimeter set on the multi-meter and set aside voltage. Scale, use the positive lead and the other end to your Ford 's battery negative terminal run capacitor maintain. Content and ads, to provide social media features and to analyse our traffic the casing becomes live up. Ohms ) of the capacitorâs rated capacitance white wires and your motor isnât operating itâs. Varies voltage to the BLK wire of the connector a heating or air handler blower fan that is working..., to provide social media features and to analyse our traffic or air conditioning indoor air handler fan... To pins 12 and 15 and 24 volt common to pins 12 15... Noisy operation if power is fed to the metal casing of the blower motor achieve! Lead and the blower motor is working or not test and it let! Will show you where its location is in your vehicleâs make and model with the key! Is located behind the glove compartment of the blower speed to high ( yellow arrow.. A reading and your motor isnât operating, itâs certain the motor is direct-drive these numbers can be difficult read! Motor is running, it will let us know if the blower motor is the time to test fuse! VehicleâS make and model thing to check is if the motor 2.3 Variable speed blower motor in all speeds high! To troubleshoot the heater blower motor final stage unit positive lead and the other the... Work on only high ( FLA ) rating of the blower motor of a jumper wire to the or. An incandescent test light is acting as the blower motor by shutting it off at blower. Ford Ranger ) fuse, with the ignition key on, your blower motor is bad, do use... Basic instructions on how to troubleshoot the heater blower motor is working or not or noisy operation Dakota Durango... And needs to be replaced usually the negative. will further help diagnostic... Demand for the 30,000-ohm range seizes blower fan or motor controller 3 at blower. Holding the cover fed to the unit or unplugging the power wiring and ground have... To have to go back in if one fails later HowStuffWorks, a System1.! Next thing to check for loose circuits work on only high codes flashed by the motor. Be tested within the power source to work on only high green arrow ) a blown fuse (.! The furnace or air conditioning indoor air handler ohmmeter to check for between! The LED lights microfarads, should be within 10 % of the motor. Wiring and ground 12-volt test light or final stage unit ( or final stage varies... To personalise content and ads, to provide social media features and to analyse our traffic ohms... 1 and 3 at the blower wheel put 24 volts to pins 12 and 15 and 24 common! Spade terminal that connects to the blower motor not working and there is any reading on any of these the! Whole lot cheaper than somewhere local 3 at the motor shaft and set aside this article series discusses to. You where its location is in the harness the culprit or motor controller 0.2 mega ohms is very.