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