Now put your furnaceâs blower fan to the test. Turning the three knobs does nothing. It has a GE 2.3. 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. Continued… ECM Blower Motor Quick Test Check for a bad start capacitor or seizes blower fan or motor. Use voltmeter or ohmmeter to check for a blown fuse. There's a good chance that you can buy the original Motorcraft blower motor online for a whole lot cheaper than somewhere local. 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 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. If the motor itself has developed a fault, the fault may be a burnt wire or connection, a winding failure including insulatio⦠Inspect the capacitor visually for signs of damage. Turn the blower speed to high (yellow arrow). I have a multimeter. Any value less than about 0.2 mega ohms is a reason to discard the motor. If the motor does not run, unplug the 16 pin wiring harness from the motor (fig. Check the multimeter measurement. 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 blower motor is a D/C electric motor driven by varying current supplied by the blower motor final stage unit. To inspect the capacitor, make sure it is discharged. The heater blower motor is located behind the glove compartment of your vehicle. 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. In this case, the test light is acting as the blower motor. 5). The amperage draw, of your Dakota or Durango's blower motor should be under 40 amps. 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). Locate the retainer clip in the center of the blower wheel. Here are some tips on how to test a blower motor resistor: Start by looking for the blower fan resistor. Your DVOM should read battery volts (green arrow). Connect the other end to your Ford's battery negative terminal. Blower fan hums but does not kick on. Unscrew all the screws on the blower motor. Check that the blower wheel spins freely and all the other parts are operating properly. Open up the blower compartment of the furnace or air handler. Sometimes the trouble lies within the power supply, including branch circuit conductors or motor controller. At the bottom of this page is a video thatâs very popular. 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. Now it does not work at all. Blower Motor; The next thing to check is if the blower motor is working or not. Step 5 Read the fault codes flashed by the LED lights. Disconnect power from the blower motor by shutting it off at the disconnect box to the unit or unplugging the power source. 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. (The black wire is usually the negative.) Any value less than about 0.2 mega ohms is a reason to discard the motor. If the motor starts, the fault is in the harness. The blower motor resistor (or final stage) varies voltage to the blower motor to achieve the desired speed. Æ´XÓ±]é@§u;vÍð\(}Ð%¦VHÛ?ëÎ!¢Ë}ùvÞ}P±¿'õ!ÁpK\R+=ª¿Z;¶»¹»+ò&(Ƨɽx»e
§dË. Perhaps your blower motor has burnt out and you need a new one. Continued⦠ECM Blower Motor Quick Test Find the Full Load Amp (FLA) rating of the blower motor. Locate the blower motor. The Test Procedure 1. Open up the blower compartment of the furnace or air handler. 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. 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. 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. 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. The white wire is called the run wire. This article series discusses how to inspect and test a heating or air conditioning indoor air handler blower fan that is not working. Using a capacitor tester to test the capacitor. 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. Take the black multimeter standard test lead and touch the white wire with it. 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. Check for shorts between the power wiring and ground. Connect one end of a jumper wire to the blower motor male spade terminal that connects to the BLK wire of the connector. If itâs a zero reading, then this indicates that your winding has a shortage. If the motor is direct-drive these numbers can be difficult to read. Blower Motor Basics. If the motor does not run, unplug the 16 pin wiring harness from the motor (fig. This is a very easy test and it will let us know if the blower motor uses too much current. Take your multimeter and set it to ohms. The blower motor test, on the 3.0L Nissan Pathfinder, D21, and Pick Up, is a very easy test. Blower motor problems can cause many driver complaints. The blower motor should use less than 15 Amps. Contents of this tutorial at a glance: Blower Motor Basics. Put 24 volts to pins 12 and 15 and 24 volt common to pins 1 and 3 at the motor (fig. I like to use an incandescent test light. Step 1 Locate the fuse for the blower motor in the owners/service manual. Unscrew all the screws on the blower motor. If your blower motor fails, replace the blower and resistor together. Automotive Blower Motor. Place them in small container. You consent to our cookies if you continue to use our website. Test the fuse, with the ignition key on, using the 12-volt test light. If you have a reading and your motor isnât operating, itâs certain the motor is the problem and needs replacing. 5). The white wire is called the run wire. It reviews best practices for diagnosing common electrical problems. If the fan does not start, you have a wiring issue (circuit breaker trips) or motor ⦠I have a 2006 Bard Geothermal . Touch one lead to each motor power lead and the other to the metal motor casing. If power is supplied to blower motor through the speed switch and blower motor resistor: Disconnect the electrical connector at the blower motor. Start by turning the furnace off, turn your thermostat to âfan only,â and wait a few minutes. To find out the amperage draw, we'll test the blower motor's resistance. Allow the microprocessor to complete the diagnostic procedure for the inducer motor. 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. This test result tells you that the blower motor is bad and needs to be replaced. Put 24 volts to pins 12 and 15 and 24 volt common to pins 1 and 3 at the motor (fig. 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. 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. Anything from no air circulation to annoying or noisy operation. 6). Locate the retainer clip in the center of the blower wheel. Remove the passenger side, lower dash cover under the glove compartment that conceals the blower motor. 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. 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. 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. 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. 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? Bulging, or fluid leaking out of the unit, are ⦠Another possibility is that the driven load is jammed, binding or mismatched. I have a 2002 TJ. 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. A 1/4-inch socket will be needed to remove the screws holding the cover. The first step in diagnosing blower motor failure is to check to see if there is demand for the blower. I have replaced the resistor pack and the blower motor switch and neither has resulted in a change. Clean the blower motor with an electrical-parts cleaner. It measures the same, or similar, to the voltage you noted from the label on the electric motor if power is reaching the motor. Disconnect it from the motor shaft and set aside. Once it is discharged, use a capacitor tester to check the microfarad reading. Many blower resistors control current to the blower motor in all speeds except high. The Test Procedure 1.