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