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