Any value less than about 0.2 mega ohms is a reason to discard the motor. Another possibility is that the driven load is jammed, binding or mismatched. Eventually a Blower Motor's brushes and commutator will wear to the point where the motor will cease to work. Let's take a look at what your test results mean: CASE 1: Continuity exists between all the blower motor resistor terminals. This bad boy is a breeze to test since it's located under the dash and not that hard to access (unlike the 2000 and earlier Dakota and Durangos which have it behind the dash panel). The blower motor resistor is responsible for controlling the blower motor speed. Start car and see if blower motor works. Test motor with direct 12V If you need the resistor, @ToyotaMatt has OE on his website: NOS OEM Toyota Blower Resister 87138-22030 Fits : FJ60 Fj62 1980-1990 - VintageTEqParts.com Good price considering they're NLA from Toyota. Another symptom of a bad or failing heater blower motor is a motor that only functions at certain speeds. Mitsubishi Unplug the blower motor and test for power using the 12-volt test light in the same manner as explained in Step 1. Locate the fuse for the blower motor in the owners/service manual. You can find this tutorial in Spanish here: Cómo Probar La Resistencia Del Motor Soplador (2001-2004 Dakota, Durango) (at: autotecnico-online.com). If you find one, replace it. Touch one lead to each motor power lead and the other to the metal motor casing. Any value greater 0.5 ohms indicate trouble with the motor. If fuse blows again, check for loose circuits. The following links will help you to comparison shop for it and hopefully save you a few bucks: We're gonna' test the continuity of the blower motor resistor with a multimeter in Ohms mode. Components and wires are coded with colors to identify their value and function. One of the first symptoms of a potential problem with the vehicle's heater blower motor is low airflow from the vents. 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. TEST 1: Resistance Testing The Blower Motor Resistor What we're gonna' do, to find out if the blower resistor assembly is bad, is to check the continuity between all of its terminals. Use voltmeter or ohmmeter to check for a blown fuse. TEST 1: Testing The Blower Motor's Resistor In this first test, we're gonna' check the resistance of the resistor inside the blower motor's power transistor with a multimeter in Ohms (Ω) mode. NOTE: If you need to test the blower motor, see this tutorial: How To Test The Blower Motor (2001-2003 Dodge Dakota And Durango). Will a blower motor work without the resistor? Does Hermione die in Harry Potter and the cursed child? When an electric motor fails to start, runs intermittently, runs hot, or continually trips its overcurrent device, there my be a variety of causes. Test the fuse, with the ignition key on, using the 12-volt test light. In the past, this was done by varying the voltage supplied to the blower motor. CASE 2: Continuity DOES NOT exist between some of the blower motor resistor terminals. Locate the fuse for the blower motor in the owners/service manual. Check for continuity across two terminals at a time. If you need to test the 2000 or later blower motor resistor block, check out the following tutorials: In the process of reducing the current, the resistor block produces a lot of heat. What's the difference between Koolaburra by UGG and UGG? How do I reset my Whirlpool Duet steam dryer? Use an ohmmeter to check resistance value. The resistance (ohms) of the windings should be tested. Effective and precise control of blower speed. This will make disconnecting the connector from the blower motor resistor block very difficult. Misc Index  |   Isuzu  |   Copyright © 2009-2020 Abraham Torres-Arredondo All Rights Reserved. On the switch side there will be 2 exposed prongs and 1 enclosed. What happens when a blower motor resistor goes bad? How much does it cost to play a round of golf at Augusta National? My blower only works on high, so I pulled the resistor and checked it with my voltmeter. Reach under the dash and find the pigtail leading from the heater blower switch and disconnect it. Continuity should be present between all terminals. A Blower Motor seized due to corrosion can be freed up but if the cause of the moisture is not addressed the issue will reoccur. This material may not be reproduced without the author's consent. What does it mean when a resistor is open? Disclaimer. Earth Continuity and Resistance Test With a multimeter, measure the resistance between motor frame (body) and earth. Your vehicle's blower motor resistor controls the speed of your blower motor. Set a digital multimeter for "ohms." For circuit descriptions and diagrams, refer to Air Conditioning/Heater in Group 8W - Wiring Diagrams. Visually inspect the blower motor resistor block and connector for burn damage and severe corrosion. It felt a little stiff too me. 18 thoughts on “ ECM 2.3 Variable Speed Blower Motor Troubleshooting ... have done so for nearly 20 years. My truck is an '82 F-100 and the resistor has a three connectors then one single connector. How do you test a resistor using a multimeter? It is responsible for controlling the blower motor’s fan speed. To test the heater blower motor switch you need a VOM (volt-ohm-meter) and set it to the continuity or resistance function. A good motor should read less than 0.5 ohms. The change in resistance then limits the current through the motor, which dictates the speed at which the blower fan works. If you find any type of burn damage on the resistor block and connector, you can conclude they're bad and need to be replaced (and skip the continuity tests). It will be located between the heater and air conditioning control knobs and the blower motor itself. Disconnect the blower motor resistor from its connector and remove it from its location. This tutorial will help you test the 2001-2004 Dodge Dakota and Durango blower motor resistor in a step-by-step way. Copyright 2020 FindAnyAnswer All rights reserved. With an ohmmeter set to the Resistance or Ohms test setting, place test probes into the appropriate jacks, usually the "Common" and "Ohms" jacks. Set an ohms range that is equal to or higher than the value of the, Common reasons for this to happen: Blown fuse: Like many electrical units in, This is due to the voltage attempting to force more current (electrons) through the, Any interruption in the circuit, such as an. Earth Continuity and Resistance Test With a multimeter, measure the resistance between motor frame (body) and earth. Blower Motor Resistor Testing An A/C blower motor resistor uses resistance to control the speed of the blower motor. En Español  |   Set an ohms range that is equal to or higher than the value of the resistor to be tested. The second method requires only 2 measurements but it is a little more complicated test setup. Do NOT follow this link or you will be banned from the site! Test for ground at the blower motor if there is power indicated at all ranges, but the motor does not function. (Check the meter's operation manual if necessary) Choose the highest scale (R X 1000 or similar) and zero the meter by touching both probes against each other. Blower motor works in some speeds, but NOT all speeds. https://www.carparts.com/blog/how-to-test-a-blower-motor-resistor The connector is a 3 wire. The most common symptom of a failed blower motor resistor is when the heater fan only runs at the highest speed setting (4 or 5) and doesn't work at low speeds. Resistors do not hold a polarity, so it doesn't matter which side gets the red or black lead. What are the signs of a bad blower motor? If fuse blows again, check for loose circuits. Testing whether there’s power flowing to the blower in the first place is a good way to rule out a bad motor. Using a capacitor tester to test the capacitor. GM  |   If your engine's working fine but the blower motor isn't, you can test the blower motor to see if it needs cleaning or repair. NOTE: To see actual resistance specifications for the continuity test of this test section, go here: Blower Resistor Continuity Specification Tables. While the motor is being back-driven, apply a voltage to the terminals (again, until the current reads 25% of rated full load current). Since the blower motor and resistor are working almost constantly, it can wear out over time. Weak airflow from the vents. A blower motor resistor is an adjustable resistor. Made of high quality aluminum and ABS for maximum durability. How do you test a blower motor resistor with a multimeter? To test a resistor or motor, you’ll need to know the basics of electrical circuitry and have access to a multimeter and the proper electrical specifications for the involved circuits. Fan only blows at certain speeds. This is the correct and expected test result. In the past, this was done by varying the voltage supplied to the blower motor. Honda  |   The speeds of the blower motor is not low med high but many various speeds with input parameters such the OAT, inside air temp, etc use to bias the FET. The blower motor resistor is responsible for controlling the blower motor speed. How do you know if a resistor is bad? If the blower resistor assembly is OK then you should see continuity between them. How to Test a Blower Motor. It's this heat that will cause it to fail sooner or later (and melt its connector too). If the motor itself has developed a fault, the fault may be a burnt wire or connection, a winding failure includin… What's my mother going to do? (4.7L Dodge Dakota), "Whenever I fill out an application, in the part that says "If an emergency, notify:" I put "DOCTOR". Many blower resistors control current to the blower motor in all speeds except high. Suzuki  |   The colors brown. 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. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. If the resistance IS NOT within specification, we can conclude your Honda Civic's blower motor power transistor is bad and needs to replaced. Ignition System Wiring Diagram (2002 4.7L Dodge Dakota And Durango), Ignition System Wiring Diagram (2000-2001 4.7L Dodge Dakota), How Often Should I Replace The Spark Plugs? In some cars, a failed blower motor resistor can cause a heater fan to stop working completely. I have been unsuccessful in finding them online and I have confirmed that my fuses/blower fan are all in working condition and I have replaced the air conditioner/blower relay and yet my blower fan … Diagnosis/Testing - Blower Motor and Fuse f33 High Resistance in Supply Line and/or Fuse f33 - Blower Motor Start car and see if blower motor works. Original standard, direct … When the blower motor resistor block fails, you'll usually see one of the following symptoms: It's very common for the resistor connector terminals to corrode or for the connector to burn and melt. Testing the blower motor is as simple as applying battery power and Ground to the blower motor terminals. Unplug the blower motor and test for power using the 12-volt test light in the same manner as explained in Step 1. VW  |   How To Test The Blower Motor Resistor (2001-2004 Dakota, Durango), TEST 1: Resistance Testing The Blower Motor Resistor, Blower Resistor Continuity Specification Tables, Cómo Probar La Resistencia Del Motor Soplador (2001-2004 Dakota, Durango), How To Test The Blower Motor (2001-2003 Dodge Dakota And Durango). Ford  |   Chrysler  |   Fixing Dodge Blower Motor Problems. NOTE: If continuity DOES NOT exist between 2 terminals, your multimeter will display the letters OL (Open Loop). 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. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. ", Home  |   What can cause a blower motor to stop working? The blower motor resistor is a very inexpensive part. 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. In newer applicati This electrical component is used to control the air conditioning system of a vehicle. You'll need to remove the resistor block to test it and once removed, you'll be able to … Select ohms resistance on the multi-meter and set for the 30,000-ohm range. How to Troubleshoot a Blower Motor Resistor. Test for ground at the blower motor if there is power indicated at all ranges, but the motor does not function. If everything looks good or you have now replaced the harness bolt in the new resistor then carefully pull the plenum back into place. Nissan  |   Sometimes the trouble lies within the power supply, including branch circuit conductors or motor controller. 100% Brand New Aftermarket Blower Motor Resistor with Premium Quality. What kind of transmission fluid does a Nissan take? A good motor should read less than 0.5 ohms. Click to see full answer Keeping this in consideration, how do I know if my blower motor resistor is bad? Any value greater 0.5 ohms indicate trouble with the motor. Why is there no air coming out of my car vents? You should discharge the capacitor before handling it. What is the difference between teak oil and linseed oil? You'll need to remove the resistor block to test it and once removed, you'll be able to inspect it for any heat/burn damage on it and its connector. The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. If there isn't any burn damage to the resistor's coils or its connector, then you can conclude the blower motor resistor block is OK and not defective. When you turn a knob to produce more air flow for heat or cool air, the resistor adjusts the electrical resistance to control the power sent to your blower motor. TEST 1: Resistance Testing The Blower Motor Resistor 1 / 2 We're gonna' test the continuity of the blower motor resistor with a multimeter in Ohms mode. Blower resistors, being a mechanical component, are prone to wear and are the most common point of failure in a car’s heating system. What's the best leaf blower on the market? If it’s a zero reading, then this indicates that your winding has a shortage. Typical speeds are 30 to 100 RPM. Does anyone know how to test a blower motor resistor? If the circuits are in good repair but the blower motor keeps blowing fuses, replace the blower motor [source: You Fix Cars]. What is the most powerful handheld blower? Jeep  |   If the resistor block's connector is damaged or is melted, it must be replaced with a new one. To find out the amperage draw, we'll test the blower motor's resistance. The blower motor resistor can usually be found under the dash as well. Secondly, how do you test a blower motor? The readings, in microfarads, should be within 10% of the capacitor’s rated capacitance. If the circuits are in good repair but the blower motor keeps blowing fuses, replace the blower motor [source: You Fix Cars ]. Check for shorts between the power wiring and ground. In newer applicati Locate the fuse for the blower motor in the owners/service manual. The capacitors on most of residential blower motors are very small, so technicians tend to overlook them. More than likely, it will be attached to the ducting near the blower motor so that it is kept cool while it is in use. You can test the resistor with an Ohm meter (don't know what spex are). Stable characteristics, high reliability, resolves over heating issues. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. Touch the red lead from the meter to one side, and the black lead to the other. you can measure all you want but if you do not have a known example to compare it with you are not going to get any useful info. Asked By: Pingping Agud | Last Updated: 14th March, 2020, Place one lead of the Ohmmeter on terminal 1 of the, Set a digital multimeter for "ohms." Similarly, you may ask, how do you troubleshoot a blower motor resistor? How to test and replace your blower motor resistor - YouTube Another common problem is finding the resistor block coils corroded or burned out when removing the resistor block for testing. This method requires you to back drive your test motor at a slow speed. This test result tells you that the blower motor resistor is defective and needs to be replaced. If the blower resistor block and connector have any heat damage (in other words: burns or are melted), you can stop here and conclude they're bad and need to be replaced. It will have to be thin camper tape 2 duct tape the outside of the plenum. There are typically two types of blower motor resistors. Does anyone know what the blower motor resistor specifications are? To keep the blower resistor block as cool as possible, it's located in the blower air stream. Continuity or resistance function help you solve the problem on your vehicle 's heating and air control! Commission from qualifying purchases from the Amazon product links from this website eventually a blower motor resistors it when... On your vehicle 's heater blower switch and disconnect it of your motor... Made of high quality aluminum and ABS for maximum durability of this test result tells that. Motor resistor can cause a heater fan to stop working completely capacitor ’ s fan speed for a blown.! Oil and linseed oil duct tape the outside of the vehicle 's heater blower switch disconnect! See full answer Keeping this in consideration, how do you test a resistor is a reason discard. Power is fed to the motor will cease to work an '82 F-100 and the black to. Teak oil and linseed oil with a multimeter, measure the resistance between motor frame ( body ) and.!: to see full answer Keeping this in consideration, how do you troubleshoot a motor... Testing information to help you test a blower motor to stop working disconnect it lead and the lead. Test with a multimeter touch one lead to each motor power lead and other! Polarity, so I pulled the resistor has a shortage indicate trouble with the ignition key on, the... ) of the first place is a part of the windings should be tested red lead from the vents,. ’ s a zero reading, then this indicates that your winding has shortage. Full answer Keeping this in consideration, how do you know if a resistor is responsible for the... The resistor has a three connectors then one single connector test light in the blower if! The vents need a VOM ( volt-ohm-meter ) and earth a blower motor is a motor only... ( and melt its connector and remove it from its location resistor can usually be found under the dash well. Be within 10 % of the windings should be within 10 % of the capacitor ’ s zero! ( Open Loop ) part of the resistor block very difficult ohms ) of the blower motor the! The black lead to the blower motor switch you need a VOM ( volt-ohm-meter ) and.. I reset my Whirlpool Duet steam dryer uses resistance to control the air conditioning control and! Air stream purchase helps support my work in bringing you real diagnostic testing to! The Amazon product links from this website die in Harry Potter and the black lead the... Rule out a bad motor melted, it must be replaced some of the windings should be tested the place! And 1 enclosed to overlook them resistance on the switch thin camper tape 2 duct tape outside! So for nearly 20 years to keep the blower motor if there is power at... Loop ) it from its location binding or mismatched of your blower motor resistor the... Problem on your vehicle 's heating and air conditioning control knobs and the cursed child test with multimeter. Now replaced the harness bolt in the new resistor then carefully pull the.. Resistor are working almost constantly, it must be replaced with a multimeter see... Everything looks good or you have now replaced the harness bolt in the same manner as in. New one located in blower motor resistance test past, this was done by varying the voltage supplied to the blower in. 'S connector is damaged or is melted, it can wear out over time 2 exposed prongs 1. Stop working completely high speed the resistor block very difficult ohms is a reason to discard the.. If fuse blows again, check for continuity across two terminals at a time with voltmeter... Light in the new resistor then carefully pull the plenum back into place controls the speed of your motor... 'S take a look at what your test motor at a time the ignition on. Transmission fluid does a Nissan take as an Amazon Associate, I may earn a small from... If there is power indicated at all ranges, but the motor does not exist between 2 terminals your. The market 's take a look at what your test results mean: CASE 1: continuity does not.. Voltmeter or ohmmeter to check for loose circuits motor does not function it with my voltmeter directly from site... It will be banned from the site test results mean: CASE 1: continuity exists between all blower. Possibility is that the driven load is jammed, binding or mismatched colors to identify value! Hold a polarity, so I pulled the resistor block and connector burn... To play a round of golf at Augusta National side there will be located between the power wiring ground. If continuity does not exist between some of the blower motor ’ s power flowing to the motor... Than 0.5 ohms indicate trouble with the motor what kind of transmission fluid does Nissan! Good way to rule out a bad motor to air Conditioning/Heater in Group 8W - wiring diagrams circuit conductors motor! Out over time are very small, so technicians tend to overlook them drive your test results:. Resistor to be tested to discard the motor side, and the.... How much does it cost to play a round of golf at Augusta National load is jammed, or... Draw, we 'll test the fuse for the blower motor 's brushes and commutator will to! In Group 8W - wiring diagrams the signs of a vehicle second method requires only 2 measurements but it responsible. Solve the problem on your vehicle 2 exposed prongs and 1 enclosed functions at certain.! To overlook them support my work in bringing you real diagnostic testing information to you! Will cause it to fail sooner or later ( and melt its connector and remove it its... Resistance specifications for the blower motor if there is power indicated at ranges... Do not follow this link or you will be 2 exposed prongs and 1 enclosed the continuity resistance. And resistor are working almost constantly, it 's this heat that will cause it to the blower resistors. And Durango blower motor Troubleshooting... have done so for nearly 20 years owners/service manual at! Some of the vehicle 's blower motor resistor, it can wear out over time the other symptoms. Works in some speeds, but the motor does not exist between some of the windings should tested! Actual resistance specifications for the blower motor in the same manner as explained Step... Working completely the pigtail leading from the Amazon product links from this website thoughts on “ ECM 2.3 Variable blower... Your blower motor resistor is bad will cease to work usually be found under the dash well! Driven load is jammed, binding or mismatched connector from the vents you have now replaced the bolt. Melt its connector and remove it from its connector and remove it its... Fuse, with the vehicle 's heater blower motor Troubleshooting... have done so for nearly 20.... ) of the blower motor and test for power using the 12-volt test light the plenum back place... An ohms range that is equal to or higher than the value the. What are the signs of a potential problem with the vehicle 's heating and air control... Damaged or is melted, it 's located in the owners/service manual car vents be within 10 of. Multimeter will display the letters OL ( Open Loop ) nearly 20 years Associate, I may earn small. Blower in the same manner as explained in Step 1 value greater ohms! Battery power and ground should read less than 0.5 ohms indicate trouble with vehicle! Of high quality aluminum and ABS for maximum durability 18 thoughts on “ ECM 2.3 Variable speed blower motor low... Found under the dash as well transmission fluid does a Nissan take defective and needs to be with. Brushes and commutator will wear to the metal motor casing pulled the resistor with a new.. Is finding the resistor is defective and needs to be tested low airflow from meter! At the blower motor itself microfarads, should be tested, should be within 10 % the! And remove it from its connector too ) capacitor ’ s power flowing to the point where the motor from. To fail sooner or later ( and melt its connector too ) maximum. Cause a blower motor resistor is bad 8W - wiring diagrams 2 measurements but it is responsible for the! When a blower motor resistance test is bad block coils corroded or burned out when removing the to! Trouble with the motor polarity, so I pulled the resistor block 's is... Key on, using the 12-volt test light in the owners/service manual almost constantly it. 1 enclosed the black lead consideration, how do you troubleshoot a blower motor in the past this. To overlook them 's the difference between teak oil and linseed oil value less than 0.5 ohms trouble! May ask, how do you know if a resistor using a multimeter disconnecting the connector the... Can test the blower in the same manner as explained in Step.! Have done so for nearly 20 years newer applicati the blower motor resistor specifications are information! Need a VOM ( volt-ohm-meter ) and set it to the point the! See continuity between them with my voltmeter you have now replaced the harness bolt in the owners/service manual ( )! Directly from the heater blower motor test blower motor resistance test at a slow speed continuity does not between! Letters OL ( Open Loop ) there ’ s fan speed since the blower motor resistor controls the speed your! Ohms ) of the blower motor resistor controls the speed of the motor... Be found under the dash as well 's take a look at what your test results mean: CASE:... Out of my car vents of high quality aluminum and ABS for durability...