{"id":9448,"date":"2021-05-13T01:00:00","date_gmt":"2021-05-13T08:00:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=9448"},"modified":"2025-11-07T03:17:02","modified_gmt":"2025-11-07T11:17:02","slug":"how-to-test-a-blower-motor-resistor","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/how-to-test-a-blower-motor-resistor\/","title":{"rendered":"How to Test a Blower Motor Resistor"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<!-- Added by Post\/Page Specific Custom Code plugin, thank you for using! --><html><head><style>#article-search-widget {display: none;}<\/style>\n<\/head><body><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 7<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column9448_911a92-dd > .kt-inside-inner-col,.kadence-column9448_911a92-dd > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column9448_911a92-dd > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column9448_911a92-dd > .kt-inside-inner-col{flex-direction:column;}.kadence-column9448_911a92-dd > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column9448_911a92-dd > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column9448_911a92-dd{position:relative;}@media all and (max-width: 1024px){.kadence-column9448_911a92-dd > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column9448_911a92-dd > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column9448_911a92-dd inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-9e7cde  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-4691a4\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading9448_a1518e-ac, .wp-block-kadence-advancedheading.kt-adv-heading9448_a1518e-ac[data-kb-block=\"kb-adv-heading9448_a1518e-ac\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading9448_a1518e-ac mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading9448_a1518e-ac[data-kb-block=\"kb-adv-heading9448_a1518e-ac\"] mark.kt-highlight{font-family:Inter;font-weight:500;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading9448_a1518e-ac img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading9448_a1518e-ac[data-kb-block=\"kb-adv-heading9448_a1518e-ac\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading9448_a1518e-ac summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading9448_a1518e-ac\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A visual inspection can reveal a faulty blower motor resistor because the wires are burned. Otherwise, testing a blower motor resistor involves testing it with a multimeter.<\/li>\n\n\n\n<li>Check your vehicle&rsquo;s wire schematic to find the terminal&rsquo;s input and output terminals. Then, with the multimeter set to the ohms setting, test the resistance between the resistance of the input and output terminals.<\/li>\n\n\n\n<li>If any of the input and output terminals show infinite resistance, then the blower motor resistor has failed.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>A very common issue with <a href=\"https:\/\/www.carparts.com\/blower-motor-resistor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"blower resistors\">blower resistors<\/a> is a <strong>burned out connector<\/strong>. Blower resistor terminals can develop resistance, and when they do, they get hot and begin to oxidize even further, creating large amounts of resistance where no resistance should be, heating the wire terminals and the wires feeding them until they scorch and melt the blower resistor connector. Eventually, the connector terminals become so damaged and oxidized that the blower stops working or perhaps you might notice that it only works when you wiggle the wires at the resistor connector.&nbsp;<\/p>\n\n\n\n<p><strong>Usually a simple visual inspection will reveal this kind of failure<\/strong> &ndash; the wires at the connector will be blistered and scorched with missing insulation, and sometimes the melting is severe enough that the connector may be fused to the blower resistor and can&rsquo;t be unplugged.<\/p>\n\n\n\n<p><strong>This kind of failure requires replacing the resistors as well as the resistor connector pigtail<\/strong>, but you need to do a really good job splicing the wires (and don&rsquo;t get them out of order) or you&rsquo;ll make bigger problems for yourself.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>(A burned out blower motor resistor connector) requires replacing the resistors as well as the resistor connector pigtail, but you need to do a really good job splicing the wires (and don&rsquo;t get them out of order) or you&rsquo;ll make bigger problems for yourself.<\/p>\n<cite>&ndash;<a href=\"https:\/\/www.carparts.com\/blog\/author\/richardmccuistian\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Richard McCuistian, ASE Certified Master Automobile Technician\">Richard McCuistian, ASE Certified Master Automobile Technician<\/a><\/cite><\/blockquote>\n\n\n\n<p>This meltdown type failure can also happen at the blower motor connector itself.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Blower Motor Resistor Test<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/05\/fan-level-control-1024x683.jpeg\" alt=\"adjusting fan speed of a car's a\/c\" class=\"wp-image-9454\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/05\/fan-level-control-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/05\/fan-level-control-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/05\/fan-level-control-768x512.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/05\/fan-level-control-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/05\/fan-level-control.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">Typically, if the fan will work on some speeds but not on others, the resistor is suspect.<\/figcaption><\/figure>\n\n\n\n<p>Okay, let&rsquo;s say there&rsquo;s no melting going on, but your fan doesn&rsquo;t work on all speeds. Typically, <strong>if the fan will work on some speeds but not on others, the resistor is suspect.<\/strong> If the fan won&rsquo;t work on any speeds except high speed, the blower resistor&rsquo;s thermal fuse may have failed, meaning the entire resistor needs to be replaced.&nbsp;<\/p>\n\n\n\n<p><strong><em>WARNING: Do NOT bypass the blower resistor thermal fuse if you don&rsquo;t want your car to catch fire!<\/em><\/strong><\/p>\n\n\n\n<p>Here are some tips on how to test your blower motor resistor:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Start by looking for the blower fan resistor. A repair manual can tell you where its location is in your vehicle&rsquo;s make and model.<\/li>\n\n\n\n<li>Inspect the resistor visually. Look for obvious signs of corrosion and burns from overheating. If you see signs of overheated connectors, replace the blower resistor and its connector, but again, you must splice the wires right, or you&rsquo;ll have problems at the splice later on.<\/li>\n<\/ul>\n\n\n\n<ul id=\"block-7fb68774-8585-4126-9764-a3ea2e3a80b1\" class=\"wp-block-list\">\n<li>If you want to do a quick test of the blower resistor, you can check the resistance of each of the resistors with a multimeter as follows: set the tool to read ohms (a measurement of resistance) and connect one of its probes to the common output terminal of the resistor. Use the other probe to measure the resistance between the output terminal and each of the resistor&rsquo;s input terminals. Measure the resistance between one pair of terminals at a time. Of course, to do this, you need to know which terminal is the common terminal (it&rsquo;s the one directly feeding the fan motor). And you&rsquo;ll also need to know which of the other terminals is which speed &ndash; you can find this information in an online wiring schematic for your vehicle if you know where to look.<\/li>\n\n\n\n<li><strong>If any of the points show infinite resistance, the blower motor resistor has failed.<\/strong> Infinite readings denote an open circuit.<\/li>\n<\/ul>\n\n\n\n<div class=\"rsi-card\">\n  <div class=\"rsi-thumb\">\n    <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/d_noimage.jpg\/b_white\/e_sharpen,e_auto_brightness,e_auto_contrast\/f_auto\/q_auto:eco,dpr_auto\/w_873,h_873,c_pad\/images\/kit-021424-100_1\">\n  <\/div>\n  <div class=\"rsi-info\">\n    <span class=\"rsi-title\">The Best Blower Motor Resistor Brands for Steady Airflow<\/span>\n    <span class=\"rsi-desc\">Check out the best blower motor resistor brands that offer durable, affordable replacements to restore your car&rsquo;s HVAC performance.<\/span>\n    <a href=\"https:\/\/www.carparts.com\/blog\/the-best-blower-motor-resistor-brands-for-steady-airflow-quickref\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Discover Your Options\">Discover Your Options<\/a>\n  <\/div>\n<\/div>\n\n<!-- Error, Advert is not available at this time due to schedule\/geolocation restrictions! -->\n\n\n<p>Be careful when handling the blower resistor. Since electric currents pass through the resistor for extended periods, the device can build up significant heat&mdash;enough to burn your fingers or worse.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is a Blower Motor Resistor and What Does it Do?<\/h2>\n\n\n\n<p>The blower motor resistor controls the fan speed of the <a href=\"https:\/\/www.carparts.com\/blower-motor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"blower motor\">blower motor<\/a> and the resulting change in air pressure produced by the movement of the blower fan. It accomplishes this by regulating the electric current that powers the motor.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Does a Blower Motor Resistor Work?<\/h2>\n\n\n\n<p>On climate control systems <em>without<\/em> automatic temperature controls, the <a href=\"https:\/\/www.carparts.com\/blog\/what-is-a-car-blower-motor-purpose-symptoms-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"blower motor speeds\">blower motor speeds<\/a> are controlled by a switch wired to a stepped resistor that usually includes a thermal fuse. Because resistance creates heat while current is flowing, the blower resistor is mounted in the duct near the blower motor so the resulting airflow will keep the resistor cool.&nbsp;<\/p>\n\n\n\n<p>If the fan malfunctions (like if the fan shaft is spinning in the blower cage hub without spinning the cage) so that no air is moving past the resistor but current is still creating heat in the resistor pack, the thermal fuse that is integral to the resistor assembly opens the electrical circuit to prevent the resistor(s) from getting too hot.<\/p>\n\n\n\n<p>To understand how the blower resistor works, a simple electrical principle called &ldquo;<strong>voltage drop<\/strong>&rdquo; is used. When a switch, a resistor, and a load are wired in series, the resistor &ldquo;drops&rdquo; some of the voltage passing through it, effectively reducing both current flow and voltage at the motor. A voltmeter connected to both ends of a resistor while current is passing through it to a load will measure the amount of voltage being &ldquo;dropped&rdquo; by the resistor. Because lower voltage means lower current delivered to the fan, the stepped resistor circuit can be used to control fan speed.<\/p>\n\n\n\n<p>The blower switch and its gang of resistors are wired so that when the blower switch is set at the lowest speed, the maximum amount of voltage is dropped and the least amount of current is fed to the motor because it is passing through an entire series of resistors &ndash; for our purposes we&rsquo;ll say there are three resistors.<\/p>\n\n\n\n<p>In the next highest speed, one of the three resistors is bypassed and since the voltage is only having to push the current through two resistors, the fan motor runs a bit faster. In the next highest speed, two of the three resistors are bypassed and only one resistor remains in series with the motor (load).&nbsp;<\/p>\n\n\n\n<p>Finally, with the fan switch on the highest speed, the fan motor is receiving system voltage (14.5 with the engine running). Some systems will energize a relay when the switch is set at the highest fan speed. The relay then closes its contacts, feeding full voltage to the fan, because a relay can handle the current better than the fan switch.<\/p>\n\n\n<style>.kadence-column9448_a15006-f1 > .kt-inside-inner-col,.kadence-column9448_a15006-f1 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column9448_a15006-f1 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column9448_a15006-f1 > .kt-inside-inner-col{flex-direction:column;}.kadence-column9448_a15006-f1 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column9448_a15006-f1 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column9448_a15006-f1{position:relative;}@media all and (max-width: 1024px){.kadence-column9448_a15006-f1 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column9448_a15006-f1 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column9448_a15006-f1 kb-section-dir-vertical kb-section-sm-dir-vertical inner-column-1 pro-tip-widget\"><div class=\"kt-inside-inner-col\"><style>.kb-row-layout-id9448_c48c5c-d5 > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id9448_c48c5c-d5 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id9448_c48c5c-d5 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-none, 0rem );row-gap:var(--global-kb-gap-md, 2rem);padding-top:20px;padding-right:32px;padding-bottom:20px;padding-left:16px;grid-template-columns:minmax(0, calc(10% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)))minmax(0, calc(90% - ((var(--global-kb-gap-none, 0rem ) * 1 )\/2)));}.kb-row-layout-id9448_c48c5c-d5 > .kt-row-layout-overlay{opacity:0.00;}.kb-row-layout-id9448_c48c5c-d5 .kt-row-layout-bottom-sep{height:100px;}.kb-row-layout-id9448_c48c5c-d5 .kt-row-layout-bottom-sep svg{width:100%;}.kb-row-layout-id9448_c48c5c-d5 .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}.kb-row-layout-id9448_c48c5c-d5 .kt-row-layout-top-sep{height:100px;}.kb-row-layout-id9448_c48c5c-d5 .kt-row-layout-top-sep svg{width:100%;}.kb-row-layout-id9448_c48c5c-d5 .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){.kb-row-layout-id9448_c48c5c-d5 > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){.kb-row-layout-id9448_c48c5c-d5 .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){.kb-row-layout-id9448_c48c5c-d5 .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){.kb-row-layout-id9448_c48c5c-d5 > .kt-row-column-wrap{padding-top:28px;padding-right:16px;padding-bottom:25px;padding-left:16px;grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}.kb-row-layout-id9448_c48c5c-d5 .kt-row-layout-bottom-sep{height:px;}.kb-row-layout-id9448_c48c5c-d5 .kt-row-layout-bottom-sep svg{width:%;}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id9448_c48c5c-d5 alignnone pro-tip-wrap wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-right-golden kt-tab-layout-right-golden kt-mobile-layout-right-golden kt-row-valign-top\">\n<style>.kadence-column9448_eff5df-e1 > .kt-inside-inner-col{display:flex;}.kadence-column9448_eff5df-e1 > .kt-inside-inner-col{min-height:45px;}.kadence-column9448_eff5df-e1 > .kt-inside-inner-col,.kadence-column9448_eff5df-e1 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column9448_eff5df-e1 > .kt-inside-inner-col{row-gap:0px;column-gap:0px;}.kadence-column9448_eff5df-e1 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column9448_eff5df-e1 > .kt-inside-inner-col > *, .kadence-column9448_eff5df-e1 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column9448_eff5df-e1 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column9448_eff5df-e1 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column9448_eff5df-e1 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column9448_eff5df-e1{position:relative;}@media all and (max-width: 1024px){.kadence-column9448_eff5df-e1 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column9448_eff5df-e1 > .kt-inside-inner-col > *, .kadence-column9448_eff5df-e1 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column9448_eff5df-e1 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column9448_eff5df-e1 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column9448_eff5df-e1 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column9448_eff5df-e1 > .kt-inside-inner-col > *, .kadence-column9448_eff5df-e1 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column9448_eff5df-e1 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column9448_eff5df-e1 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column9448_eff5df-e1 kb-section-dir-horizontal kb-section-md-dir-horizontal inner-column-1 pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image9448_9cda5f-e3.kb-image-is-ratio-size, .kb-image9448_9cda5f-e3 .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image9448_9cda5f-e3.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image9448_9cda5f-e3 .kb-image-is-ratio-size{align-self:unset;}.kb-image9448_9cda5f-e3 figure{max-width:45px;}.kb-image9448_9cda5f-e3 .image-is-svg, .kb-image9448_9cda5f-e3 .image-is-svg img{width:100%;}.kb-image9448_9cda5f-e3 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image9448_9cda5f-e3\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/f_auto,dpr_auto,q_auto,c_pad\/carparts\/blog\/widgets\/protip\/services-icon\" alt=\"\" class=\"kb-img\"><\/figure><\/div>\n<\/div><\/div>\n\n\n<style>.kadence-column9448_d12c3e-c5 > .kt-inside-inner-col,.kadence-column9448_d12c3e-c5 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column9448_d12c3e-c5 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column9448_d12c3e-c5 > .kt-inside-inner-col{flex-direction:column;}.kadence-column9448_d12c3e-c5 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column9448_d12c3e-c5 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column9448_d12c3e-c5{position:relative;}@media all and (max-width: 1024px){.kadence-column9448_d12c3e-c5 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column9448_d12c3e-c5 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column9448_d12c3e-c5 inner-column-2 pro-tip-item2\"><div class=\"kt-inside-inner-col\">\n<div class=\"protip-desc\">\n\t<div class=\"help-tip\">\n\t\t<p><strong>Pro Tips<\/strong> are nuggets of information direct from ASE-certified automobile technicians working with CarParts.com, which may include unique, personal insights based on their years of experience working in the automotive industry. These can help you make more informed decisions about your car.<\/p>\n\t<\/div>\n    <div class=\"help-caption\">\n        <p>\n            <strong>Pro Tip:<\/strong>\nMany blower fans will have a relay delivering power to the &ldquo;hot&rdquo; fan terminal and the blower resistor will provide the path to ground.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n\n<\/div><\/div><\/div><\/div>\n\n\n\n    <div class=\"ai-summary-widget\">\n\n        <div class=\"ai-summary-grid\">\n\n            <div>\n                <div class=\"ai-avatar\">\n                    <figure>\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/ai-summary\/ai-bot\" alt=\"AI robot\">\n                    <\/figure>\n                    <span>ELI5<\/span>\n                <\/div>\n            <\/div>\n            <div>\n                <p>A blower motor resistor is like a speed controller for your car&rsquo;s heater and AC fan. It changes how fast the fan blows by controlling how much electricity reaches the motor. When you turn the fan speed knob, it sends power through different resistors, which slow down the electricity to make the fan spin slower or faster. The resistor is placed near the fan so air can keep it cool, but if the fan stops working, the resistor can overheat and shut off to prevent damage. The lowest fan speed uses the most resistors, making the fan spin the slowest. As you turn the speed higher, fewer resistors are used, and at full blast, the fan gets full power. Some cars also use a relay to help send power safely to the fan on the highest setting.<\/p>    \n            <\/div>\n\n        <\/div>\n\n        <div class=\"ai-summary-tooltip\">   \n            <p>Not everyone is an auto repair expert. <strong>ELI5 (&ldquo;Explain Like I&rsquo;m Five&rdquo;)<\/strong> provides layperson-friendly explanations of complex automotive concepts, systems, &amp; parts, so you can fully understand their importance. Great for casual car owners and DIY beginners! Powered by AI.<\/p>\n        <\/div>\n\n    <\/div>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Symptoms of a Bad Blower Motor Resistor?<\/h2>\n\n\n\n<p>Every time you fiddle with the fan speed of your car&rsquo;s air conditioning or heating system, you change the current that flows through the blower motor resistor on the way to the blower motor.&nbsp;<\/p>\n\n\n\n<p>A bad or failing blower motor resistor hampers the efficiency of the heating and air conditioning system. The most common blower motor resistor symptoms include:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Blower Only Works on Higher Speeds<\/h3>\n\n\n\n<p>A working resistor can shift between speed settings according to the user&rsquo;s preference. If one of the resistors is burned out, the only speeds that will work are the speeds above the burned out resistor.<\/p>\n\n\n\n<p>A blower stuck on a high-speed setting will keep blasting you with hot or cold air when you don&rsquo;t need it, though one that&rsquo;s stuck on the low setting can be just as frustrating.<\/p>\n\n\n\n<p>This symptom isn&rsquo;t limited to a bad blower motor resistor. A broken blower motor switch can also stop the blower from changing to certain speed settings. If your blower motor cannot change to certain speeds, check both the resistor and the switch on your dashboard. The most common failure points are the resistor and the motor itself.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">No air comes out of the vents<\/h3>\n\n\n\n<p>There are instances where a bad resistor will prevent the current&nbsp; from reaching the blower motor altogether. Without any power, the motor won&rsquo;t run. As a result, the blower fan stays still and silent, and no air blows out of the vents.<\/p>\n\n\n\n<p>This symptom can also stem from a failed blower fan or several other issues, such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Burned connectors or thermal fuse failure<\/li>\n\n\n\n<li>Blown fuse or circuit breaker<\/li>\n\n\n\n<li>Faulty switch or wiring<\/li>\n\n\n\n<li>Bad ground<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Causes of a Bad Blower Motor Resistor<\/h2>\n\n\n\n<p>Resistors have it rough. They always have electricity flowing through them, and the voltage can change sharply as you adjust the strength of the blower fan.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"679\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/05\/broken-car-ac-1024x679.jpeg\" alt=\"broken car a\/c\" class=\"wp-image-9455\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/05\/broken-car-ac-1024x679.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/05\/broken-car-ac-300x199.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/05\/broken-car-ac-768x509.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/05\/broken-car-ac.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">If a motor finds it harder to move because of jamming or worn bearings, it can raise the resistor&rsquo;s temperatures to dangerous levels.<\/figcaption><\/figure>\n\n\n\n<p>The most likely reasons for blower motor resistor failure include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Corrosion from long exposure to air and moisture<\/li>\n\n\n\n<li>Overheating&mdash;if a motor finds it harder to move because of jamming or worn bearings, it can raise the resistor&rsquo;s temperatures to dangerous levels.<\/li>\n\n\n\n<li>Normal wear due to time and use<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What is the Cost of a Replacement Blower Motor Resistor?<\/h2>\n\n\n\n<p>You can still drive your car despite a faulty blower motor resistor. However, you&rsquo;ll probably find it uncomfortable to have the blower running at one speed setting the entire time or having limited access to certain settings.<\/p>\n\n\n\n<p>Depending on the manufacturer and model, a blower motor resistor can go anywhere between $3 and $335 on CarParts.com. The replacement parts come in individual units, sets of two resistors, or as part of a blower motor resistor kit.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Products Mentioned in this Guide<\/h2>\n\n\n\n<div class=\"reusable-productlink\">\n\n<!-- start of editable content -->\n\n<a href=\"https:\/\/www.carparts.com\/blower-motor-resistor\" target=\"_blank\" aria-label=\"blower motor resistor\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/repa191807_1\">\n<strong>Blower Motor Resistor<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/blower-motor\" target=\"_blank\" aria-label=\"blower motor\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/repc190201_1\">\n<strong>Blower Motor<\/strong>\n<\/a>\n\n<!-- end of editable content -->\n\n<\/div>\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 7<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>A very common issue with blower resistors is a burned out connector. Blower resistor terminals can develop resistance, and when&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/how-to-test-a-blower-motor-resistor\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1651,"featured_media":9451,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[3754,52],"tags":[1600],"ppma_author":[2607,2985],"class_list":{"0":"post-9448","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-air-conditioning-and-heating","8":"category-diy","9":"tag-blower-motor-resistor","10":"entry"},"acf":{"adrotate_specific_mobile_ad":"468","adrotate_specific_desktop_ad":"467"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Test a Blower Motor Resistor - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Do you think your vehicle\u2019s blower motor resistor is bad? This is how to test your blower motor resistor.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.carparts.com\/blog\/how-to-test-a-blower-motor-resistor\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Test a Blower Motor Resistor - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Do you think your vehicle\u2019s blower motor resistor is bad? This is how to test your blower motor resistor.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/how-to-test-a-blower-motor-resistor\/\" \/>\n<meta property=\"og:site_name\" content=\"In The Garage with CarParts.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:published_time\" content=\"2021-05-13T08:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-11-07T11:17:02+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/05\/car-ac.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"996\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"CarParts.com Research Team, Richard McCuistian, ASE Certified Master Automobile Technician\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@https:\/\/twitter.com\/CarPartscom\" \/>\n<meta name=\"twitter:site\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"CarParts.com Research Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"9 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/how-to-test-a-blower-motor-resistor\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/how-to-test-a-blower-motor-resistor\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"1651\",\"name\":\"CarParts.com Research Team\",\"jobTitle\":\"Expert Automotive Writer\",\"description\":\"The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. 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