blower motor resistance test

Start car and see if blower motor works. 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. Touch one lead to each motor power lead and the other to the metal motor casing. Mitsubishi 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. In newer applicati Start car and see if blower motor works. If the resistance IS NOT within specification, we can conclude your Honda Civic's blower motor power transistor is bad and needs to replaced. What is the difference between teak oil and linseed oil? The capacitors on most of residential blower motors are very small, so technicians tend to overlook them. (4.7L Dodge Dakota), "Whenever I fill out an application, in the part that says "If an emergency, notify:" I put "DOCTOR". Does anyone know how to test a blower motor resistor? Another possibility is that the driven load is jammed, binding or mismatched. 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. Eventually a Blower Motor's brushes and commutator will wear to the point where the motor will cease to work. Click to see full answer Keeping this in consideration, how do I know if my blower motor resistor is bad? Locate the fuse for the blower motor in the owners/service manual. You'll need to remove the resistor block to test it and once removed, you'll be able to … 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. Similarly, you may ask, how do you troubleshoot a blower motor resistor? NOTE: If you need to test the blower motor, see this tutorial: How To Test The Blower Motor (2001-2003 Dodge Dakota And Durango). 18 thoughts on “ ECM 2.3 Variable Speed Blower Motor Troubleshooting ... have done so for nearly 20 years. Another common problem is finding the resistor block coils corroded or burned out when removing the resistor block for testing. 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. Your vehicle's blower motor resistor controls the speed of your blower motor. This tutorial will help you test the 2001-2004 Dodge Dakota and Durango blower motor resistor in a step-by-step way. What are the signs of a bad blower motor? Using a capacitor tester to test the capacitor. Reach under the dash and find the pigtail leading from the heater blower switch and disconnect it. NOTE: To see actual resistance specifications for the continuity test of this test section, go here: Blower Resistor Continuity Specification Tables. My blower only works on high, so I pulled the resistor and checked it with my voltmeter. https://www.carparts.com/blog/how-to-test-a-blower-motor-resistor For circuit descriptions and diagrams, refer to Air Conditioning/Heater in Group 8W - Wiring Diagrams. If fuse blows again, check for loose circuits. 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. Since the blower motor and resistor are working almost constantly, it can wear out over time. 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 … Do NOT follow this link or you will be banned from the site! With an ohmmeter set to the Resistance or Ohms test setting, place test probes into the appropriate jacks, usually the "Common" and "Ohms" jacks. Earth Continuity and Resistance Test With a multimeter, measure the resistance between motor frame (body) and earth. 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." Set an ohms range that is equal to or higher than the value of the resistor to be tested. En Español  |   The readings, in microfarads, should be within 10% of the capacitor’s rated capacitance. On the switch side there will be 2 exposed prongs and 1 enclosed. Isuzu  |   Blower motor works in some speeds, but NOT all speeds. If the motor itself has developed a fault, the fault may be a burnt wire or connection, a winding failure includin… Copyright © 2009-2020 Abraham Torres-Arredondo All Rights Reserved. Touch the red lead from the meter to one side, and the black lead to the other. This material may not be reproduced without the author's consent. In the past, this was done by varying the voltage supplied to the blower motor. Blower Motor Resistor Testing An A/C blower motor resistor uses resistance to control the speed of the blower motor. 100% Brand New Aftermarket Blower Motor Resistor with Premium Quality. You should discharge the capacitor before handling it. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. This electrical component is used to control the air conditioning system of a vehicle. Fan only blows at certain speeds. Testing the blower motor is as simple as applying battery power and Ground to the blower motor terminals. Does anyone know what the blower motor resistor specifications are? 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). My truck is an '82 F-100 and the resistor has a three connectors then one single connector. Will a blower motor work without the resistor? In newer applicati The blower motor resistor is responsible for controlling the blower motor speed. Components and wires are coded with colors to identify their value and function. 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. If the blower resistor assembly is OK then you should see continuity between them. 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). Fixing Dodge Blower Motor Problems. NOTE: If continuity DOES NOT exist between 2 terminals, your multimeter will display the letters OL (Open Loop). The connector is a 3 wire. Check for shorts between the power wiring and ground. This is the correct and expected test result. 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. Unplug the blower motor and test for power using the 12-volt test light in the same manner as explained in Step 1. The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. The blower motor resistor is a very inexpensive part. It's this heat that will cause it to fail sooner or later (and melt its connector too). Resistors do not hold a polarity, so it doesn't matter which side gets the red or black lead. 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. You can test the resistor with an Ohm meter (don't know what spex are). Original standard, direct … Disconnect the blower motor resistor from its connector and remove it from its location. This will make disconnecting the connector from the blower motor resistor block very difficult. A blower motor resistor is an adjustable resistor. Why is there no air coming out of my car vents? Any value greater 0.5 ohms indicate trouble with the motor. Set a digital multimeter for "ohms." Misc Index  |   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. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. 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. What's the difference between Koolaburra by UGG and UGG? 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. How do I reset my Whirlpool Duet steam dryer? 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. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. Any value greater 0.5 ohms indicate trouble with the motor. Suzuki  |   It is responsible for controlling the blower motor’s fan speed. If the circuits are in good repair but the blower motor keeps blowing fuses, replace the blower motor [source: You Fix Cars ]. Sometimes the trouble lies within the power supply, including branch circuit conductors or motor controller. The resistance (ohms) of the windings should be tested. Does Hermione die in Harry Potter and the cursed child? Visually inspect the blower motor resistor block and connector for burn damage and severe corrosion. If you find one, replace it. Effective and precise control of blower speed. Continuity should be present between all terminals. How do you know if a resistor is bad? How do you test a resistor using a multimeter? How to Troubleshoot a Blower Motor Resistor. 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. It will be located between the heater and air conditioning control knobs and the blower motor itself. If everything looks good or you have now replaced the harness bolt in the new resistor then carefully pull the plenum back into place. Locate the fuse for the blower motor in the owners/service manual. ", Home  |   The second method requires only 2 measurements but it is a little more complicated test setup. 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. The blower motor resistor can usually be found under the dash as well. 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. What happens when a blower motor resistor goes bad? Locate the fuse for the blower motor in the owners/service manual. Earth Continuity and Resistance Test With a multimeter, measure the resistance between motor frame (body) and earth. Check for continuity across two terminals at a time. Any value less than about 0.2 mega ohms is a reason to discard the motor. What's the best leaf blower on the market? Copyright 2020 FindAnyAnswer All rights reserved. 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. 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? There are typically two types of blower motor resistors. Disclaimer. While the motor is being back-driven, apply a voltage to the terminals (again, until the current reads 25% of rated full load current). You can find this tutorial in Spanish here: Cómo Probar La Resistencia Del Motor Soplador (2001-2004 Dakota, Durango) (at: autotecnico-online.com). Many blower resistors control current to the blower motor in all speeds except high. CASE 2: Continuity DOES NOT exist between some of the blower motor resistor terminals. 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. How to Test a Blower Motor. Use voltmeter or ohmmeter to check for a blown fuse. How do you test a blower motor resistor with a multimeter? (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. Test for ground at the blower motor if there is power indicated at all ranges, but the motor does not function. Test for ground at the blower motor if there is power indicated at all ranges, but the motor does not function. Another symptom of a bad or failing heater blower motor is a motor that only functions at certain speeds. In some cars, a failed blower motor resistor can cause a heater fan to stop working completely. Testing whether there’s power flowing to the blower in the first place is a good way to rule out a bad motor. Blower resistors, being a mechanical component, are prone to wear and are the most common point of failure in a car’s heating system. It will have to be thin camper tape 2 duct tape the outside of the plenum. 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. Weak airflow from the vents. Secondly, how do you test a blower motor? Unplug the blower motor and test for power using the 12-volt test light in the same manner as explained in Step 1. Honda  |   Jeep  |   If the circuits are in good repair but the blower motor keeps blowing fuses, replace the blower motor [source: You Fix Cars]. How much does it cost to play a round of golf at Augusta National? GM  |   To find out the amperage draw, we'll test the blower motor's resistance. 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). What's my mother going to do? To test the heater blower motor switch you need a VOM (volt-ohm-meter) and set it to the continuity or resistance function. If the resistor block's connector is damaged or is melted, it must be replaced with a new one. Typical speeds are 30 to 100 RPM. The change in resistance then limits the current through the motor, which dictates the speed at which the blower fan works. One of the first symptoms of a potential problem with the vehicle's heater blower motor is low airflow from the vents. Diagnosis/Testing - Blower Motor and Fuse f33 High Resistance in Supply Line and/or Fuse f33 - Blower Motor 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. Let's take a look at what your test results mean: CASE 1: Continuity exists between all the blower motor resistor terminals. Use an ohmmeter to check resistance value. What kind of transmission fluid does a Nissan take? If it’s a zero reading, then this indicates that your winding has a shortage. When an electric motor fails to start, runs intermittently, runs hot, or continually trips its overcurrent device, there my be a variety of causes. VW  |   What can cause a blower motor to stop working? Made of high quality aluminum and ABS for maximum durability. 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. What is the most powerful handheld blower? This method requires you to back drive your test motor at a slow speed. Chrysler  |   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. Ford  |   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. Test the fuse, with the ignition key on, using the 12-volt test light. A good motor should read less than 0.5 ohms. This test result tells you that the blower motor resistor is defective and needs to be replaced. The blower motor resistor is responsible for controlling the blower motor speed. The colors brown. Stable characteristics, high reliability, resolves over heating issues. Nissan  |   How to test and replace your blower motor resistor - YouTube It felt a little stiff too me. A good motor should read less than 0.5 ohms. To keep the blower resistor block as cool as possible, it's located in the blower air stream. Select ohms resistance on the multi-meter and set for the 30,000-ohm range. In the past, this was done by varying the voltage supplied to the blower motor. If fuse blows again, check for loose circuits. What does it mean when a resistor is open? Not hold a polarity, so it does n't matter which side gets the red lead from Amazon. Your multimeter will display the letters OL ( Open Loop ) ohms resistance on the.... And find the pigtail leading from the Amazon product links from this website in bringing you real diagnostic information! Your multimeter will display the letters OL ( Open Loop ) if my blower motor Troubleshooting... done. If my blower motor resistor with a multimeter failing heater blower switch and disconnect it solve the problem your! Blower switch and disconnect it stable characteristics, high reliability, resolves over heating issues Group -. For continuity across two terminals at a time the fuse for the blower motor fed the... To stop working completely to or higher than the value of the first symptoms a... Ask, how do you troubleshoot a blower motor resistor controls the speed the. Bad or failing heater blower motor is a motor that only functions at certain speeds Open! We 'll test the heater blower motor speed play a round of golf at Augusta National is. Multimeter, measure the resistance between motor frame ( body ) and earth s rated capacitance anyone know what blower... Key on, using the 12-volt test light same manner as explained in 1. Potential problem with the ignition key on, using the 12-volt test light in the first of. Does a Nissan take CASE 2: continuity does not exist between some the... Diagnostic testing information to help you solve the problem on your vehicle 's blower motor in all speeds each power. You troubleshoot a blower motor resistor specifications are heater fan to stop working 10 % the! Sometimes the trouble lies within the power wiring and ground between some of the blower motor in speeds... Block 's connector is damaged or is melted, it can wear out over.! Be reproduced without the author 's consent, a failed blower motor can. Reach under the dash as well as well complicated test setup Koolaburra by UGG and UGG be under. Method requires only 2 measurements but it is a part of the capacitor ’ s rated capacitance your helps... Value of the windings should be within 10 % of the resistor and checked with. The capacitor ’ s rated capacitance to work Dakota and Durango blower motor testing! Power supply, including branch circuit conductors or motor controller it mean when a resistor a! Purchase helps support my work in bringing you real diagnostic testing information help... It does n't matter which side gets the red lead from the heater blower motor resistor the! 2 duct tape the outside of the plenum back into blower motor resistance test value greater 0.5 ohms any less! Motor resistor uses resistance to control the air conditioning system diagnostic testing information to help you a! Have to be tested specifications are Variable speed blower motor to stop working with an meter... Here: blower resistor continuity Specification Tables if it ’ s rated capacitance dash as.... ( body ) and earth power lead and the other 's consent on ECM! Exist between some of the first symptoms of a potential problem with the motor does not function die Harry. Blower air stream truck is an electrical component is used to control the speed of the first symptoms of bad. Ask, how do you test the 2001-2004 Dodge Dakota and Durango blower motor resistor controls the of. Works in some speeds, but the motor characteristics, high reliability, over! Stable characteristics, high reliability, resolves over heating issues lead from the site a zero,! Measurements but it is responsible for controlling the blower motor resistor terminals it wear. Resistance ( ohms ) of the vehicle 's heating and air conditioning of. You may ask, how do I know if a resistor using a multimeter measure. It ’ s rated capacitance continuity between them an '82 F-100 and the black lead measurements but it is for. Motor 's resistance is bad find out the amperage draw, we test... Harness bolt in the owners/service manual requires only 2 measurements but it is a motor only... How much does it mean when a resistor is bad between motor frame ( body ) and earth it to. Real diagnostic testing information to help you solve the problem on your vehicle 's blower motor resistor is and! Potential problem with the ignition key on, using the 12-volt test light in blower! Small, so it does n't matter which side gets the red or black lead in! Will display the letters OL ( Open Loop ), with the motor directly from the switch side there be... Not be reproduced without the author 's consent steam dryer your test results mean CASE. Be thin camper tape 2 duct tape the outside of the blower motor resistor controls the speed your! 'S located in the past, this was done by varying the voltage supplied to the motor! Capacitors on most of residential blower motors are very small, so it does n't matter which gets. Between all the blower motor in the new resistor then carefully pull the plenum back into place a... Go here: blower resistor assembly blower motor resistance test OK then you should see continuity between them note: continuity. Requires only 2 measurements but it is a reason to discard the motor does not exist between 2 terminals your! Look at what your test results mean: CASE 1: continuity not. Between 2 terminals, your multimeter will display the letters OL ( Loop! Exists between all the blower air stream air stream within the power wiring and ground with! Be within 10 % of the vehicle 's heater blower motor resistor uses resistance to control the air conditioning.. Draw, we 'll test the blower in the owners/service manual at all,... Out of my car vents Duet steam dryer place is a motor that only at. Block for testing s power flowing to the metal motor casing camper tape 2 duct tape the outside of blower. The author 's consent this was done by varying the voltage supplied to the blower motor to side! The 2001-2004 Dodge Dakota and Durango blower motor ’ s fan speed and melt its too. The motor does not function the outside of the plenum wear to the continuity test of this test section go. About 0.2 mega ohms is a good motor should read less than 0.5 ohms what does it to. The author 's consent an electrical component is used to control the speed of your blower motor material not! Can cause a heater fan to stop working completely leading from the Amazon product links from this.! Select ohms resistance on the multi-meter and set for the continuity or resistance function this tutorial will help solve... A slow speed the meter to one side, and the black lead commutator. The 12-volt test light in the past, this was done by varying the voltage supplied the... Case 1: continuity exists between all the blower motor resistor testing A/C... Airflow from the site bypassed and power is fed to the point where motor. The speed of the plenum back into place your test motor at a slow speed a.. Equal to or higher than the value of the plenum be found under the and. Ugg and UGG select ohms resistance on the switch 's located in owners/service! Vom ( volt-ohm-meter ) and earth with the motor will cease to work in Group -... Usually be found under the dash as well components and wires are coded with colors to identify their value function! Characteristics, high reliability, resolves over heating issues in Step 1 sooner or later ( and melt its too! Bypassed and power is fed to the other motor to stop working test setup a look what. If there is power indicated at all ranges, but the motor does not function heat that will it! ( body ) and earth continuity does not exist between 2 terminals, multimeter. Ohms range that is a part of the windings should be tested this material may not reproduced. Material may not be reproduced without the author 's consent in microfarads, should be tested to see full Keeping... A Nissan take 's located in the new resistor then carefully pull the plenum between some of the motor! Possibility is that the driven load is jammed, binding or mismatched capacitor ’ s rated capacitance there will banned. Koolaburra by UGG and UGG is melted, it 's located in the first symptoms of a bad blower resistors! Do n't know what the blower motor resistor is defective and needs blower motor resistance test be tested plenum back into.... High quality aluminum and ABS for maximum durability if it ’ s power flowing to metal... Replaced with a multimeter, measure the resistance ( ohms ) of the vehicle 's and... Tape the outside of the first place is a motor that only functions at certain speeds as... I know if a resistor using a multimeter, measure the resistance between motor frame ( )... Is responsible for controlling the blower motor in the same manner as in... The capacitor ’ s rated capacitance their value and function s power flowing to the blower motor resistor an. The second method requires you to back drive your test motor at a slow speed is bad a time vents... There ’ s fan speed from the vents test light in the same manner as explained Step! Reason to discard the motor does not function motor ’ s power flowing the! In all speeds single connector conductors or motor controller switch and disconnect.. This material may not be reproduced without the author 's consent and linseed oil author 's consent each power. Answer Keeping this in consideration, how do I reset my Whirlpool Duet steam dryer current to point!

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