{"id":82039,"date":"2023-03-23T18:49:26","date_gmt":"2023-03-24T01:49:26","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=82039"},"modified":"2025-05-26T18:47:12","modified_gmt":"2025-05-27T01:47:12","slug":"blower-motor-relay-function-causes-of-failure-and-replacement-cost","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/blower-motor-relay-function-causes-of-failure-and-replacement-cost\/","title":{"rendered":"Blower Motor Relay: Function, Causes of Failure, and Replacement Cost"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column82039_80cd23-ae > .kt-inside-inner-col,.kadence-column82039_80cd23-ae > .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-column82039_80cd23-ae > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column82039_80cd23-ae > .kt-inside-inner-col{flex-direction:column;}.kadence-column82039_80cd23-ae > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column82039_80cd23-ae > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column82039_80cd23-ae{position:relative;}@media all and (max-width: 1024px){.kadence-column82039_80cd23-ae > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column82039_80cd23-ae > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column82039_80cd23-ae inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-decc78  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-157af8\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading82039_1932c8-56, .wp-block-kadence-advancedheading.kt-adv-heading82039_1932c8-56[data-kb-block=\"kb-adv-heading82039_1932c8-56\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading82039_1932c8-56 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading82039_1932c8-56[data-kb-block=\"kb-adv-heading82039_1932c8-56\"] 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-heading82039_1932c8-56 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading82039_1932c8-56[data-kb-block=\"kb-adv-heading82039_1932c8-56\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading82039_1932c8-56 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading82039_1932c8-56\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The blower motor relay manages the amount of voltage that the blower motor receives, allowing it to function at different speeds.<\/li>\n\n\n\n<li>On some platforms, a faulty blower motor relay will cause the blower not to work at all, which means there will be no airflow from the A\/C. On others, the blower won&rsquo;t work on &ldquo;high blow&rdquo; but all the other speeds will work.<\/li>\n\n\n\n<li>The blower motor relay fails because it regularly deals with high current loads. As a result, it can overheat and eventually melt, resulting in the relay fusing itself into the fuse box.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/blower-motor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"blower motor\">blower motor<\/a> is an important part of your vehicle&rsquo;s air-conditioning system. It&rsquo;s responsible for pushing air into the cabin through the vents. It&rsquo;s controlled by the fan control switch and blower motor <a href=\"https:\/\/www.carparts.com\/relay\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"relay\">relay<\/a>, which are responsible for managing the amount of voltage the blower motor receives, allowing it to function at different speeds.<\/p>\n\n\n\n<p>In older cars, when you turn the fan control switch to the lower settings, such as low or medium, the current passes through a block of resistors before reaching the motor. The resistors regulate the flow of current, allowing you to control the blower fan speed.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"700\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/ford-blower-schematic-1024x700.jpg\" alt=\"ford blower schematic diagram\" class=\"wp-image-82615\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/ford-blower-schematic-1024x700.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/ford-blower-schematic-300x205.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/ford-blower-schematic-768x525.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/ford-blower-schematic-150x103.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/ford-blower-schematic.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">On newer vehicles, the blower is typically controlled by a module. On this Ford blower schematic, notice how the blower relay feeds power directly to the blower, and the blower resistor and the four-position blower switch are on the ground side of the circuit. This is more often true than not on most vehicles. | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"746\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/chevy-blower-schematic-1024x746.jpg\" alt=\"chevy blower schematic diagram\" class=\"wp-image-82617\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/chevy-blower-schematic-1024x746.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/chevy-blower-schematic-300x219.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/chevy-blower-schematic-768x560.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/chevy-blower-schematic-150x109.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/chevy-blower-schematic.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">On 2000s era Chevy pickups such as this diagram illustrates, the blower relay is part of the blower resistor and plays a different part in the circuit. Meanwhile, on Auto Temp Control Fords, the relay also does this. | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Symptoms of a Bad Blower Motor Relay<\/h2>\n\n\n\n<p>On platforms where the blower is directly controlled by the switch rather than a module, the relay will cause the blower not to work at all, which means there will be no airflow across the evaporator, and the effect will be the same as the A\/C not working at all.<\/p>\n\n\n\n<p>On Chevy platforms,, a faulty blower relay will cause the blower not to work on &ldquo;high blow&rdquo; but all the other speeds will work. If the blower relay on one of these sticks is closed, the blower will always run on &ldquo;high blow&rdquo; as long as the key is on.<\/p>\n\n\n\n<div id=\"article-search-widget\">\n<div class=\"cp-search\">\n<div align=\"center\">\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/w_auto,dpr_auto\/carparts\/logos\/badge_wordmark\/full_color\/CP_LOGO_COLOUR_RGB\" alt=\"CarParts.com\" width=\"300\" height=\"56\">\n<\/div>\n<form id=\"cpsearchform\" name=\"cpsearchform\" action=\"https:\/\/www.carparts.com\/search\" method=\"get\" target=\"_blank\" accept-charset=\"character_set\" aria-label=\"search CarParts.com\">\n    <input type=\"text\" class=\"keyword\" name=\"q\" placeholder=\"Search for parts on CarParts.com\" value=\"\" aria-label=\"Search CarParts.com\"><input type=\"submit\" class=\"btn-search\" value=\"Search\" aria-label=\"Search\">\n<\/form>\n<\/div>\n<\/div>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"926\" height=\"1024\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/faulty-blower-motor-relay-926x1024.jpg\" alt=\"image of a faulty blower motor relay\" class=\"wp-image-82618\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/faulty-blower-motor-relay-926x1024.jpg 926w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/faulty-blower-motor-relay-271x300.jpg 271w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/faulty-blower-motor-relay-768x850.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/faulty-blower-motor-relay-150x166.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/faulty-blower-motor-relay.jpg 1356w\" sizes=\"(max-width: 926px) 100vw, 926px\"><figcaption class=\"wp-element-caption\">A bad blower motor relay can also heat up inside the fuse box. | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<p>Because the relay&rsquo;s secondary (load carrying) terminals carry so much current, sometimes the relay and\/or blower resistor terminals will oxidize and melt their connectors.<\/p>\n\n\n\n<p>This happens more often to the blower resistor than it does to the relay. The fan motor connector shown in the photo is an example of the oxidizing and burning that takes place sometimes on a high current circuit like the blower fan or a radiator cooling fan.<\/p>\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>In some cars, a little part called a relay helps control the fan that blows air for your A\/C. If this relay breaks, the fan might stop working completely, so no cool air comes out&mdash;just like the A\/C is broken. In some Chevys, a bad relay means the fan won&rsquo;t work on the highest speed, or it might get stuck and always blow super hard. Because the fan uses a lot of power, the wires and connectors can get hot, rusty, or even melted. This happens more often to the blower resistor, but the relay can have problems too. So if your car fan acts weird or smells burnt, the relay or resistor might be the problem.<\/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\">How Does the Blower Motor Relay Work?<\/h2>\n\n\n\n<p>When you turn the fan control switch to its most powerful setting, it will send a small electric current that will activate the blower motor relay. The blower motor relay has a small electromagnetic coil between the primary (trigger) terminals on the relay.<\/p>\n\n\n\n<p>The core of this coil is soft iron and becomes a powerful magnet that pulls the secondary (load carrying) contacts together. Thus, the relay is basically an electromagnetic switch. The blower motor is a hard working component that is supposed to last the life of the vehicle but sometimes fails.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Does the Blower Motor Relay Fail?<\/h2>\n\n\n\n<p>The relay is often partnered with a fuse. If there&rsquo;s a power surge, then the fuse will sever the circuit and prevent the power surge from reaching the blower motor.<br><br>Like any other relay, the blower motor relay regularly deals with high current loads. As a result, it can overheat and eventually melt, resulting in the relay fusing itself into the fuse box.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Much Does a Replacement Blower Motor Relay Cost<\/h2>\n\n\n\n<p>Most blower motor relays cost around 15$ to $60. Their prices mostly depend on the make and model of the vehicle that they&rsquo;re made for.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Finding a Replacement Blower Motor Relay For Your Ride<\/h2>\n\n\n\n<p>It&rsquo;s best to get your vehicle checked by a mechanic right away if you suspect that it has a failed <a href=\"https:\/\/www.carparts.com\/hvac-blower-motor-relay\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"blower motor relay\">blower motor relay<\/a>. Thankfully, you can get a replacement that fits your vehicle with the help of <a href=\"https:\/\/www.carparts.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"CarParts.com\">CarParts.com<\/a>.<\/p>\n\n\n\n<p>You won&rsquo;t even have to take one step outside your door to get yourself a brand-new relay. All you need to do is visit our website and use your vehicle selector. Just be sure to input the year, make, and model of your vehicle to check out the compatible parts for your ride.<\/p>\n\n\n\n<p>We make it a point to source our auto components from some of the most reliable names in the industry. With our warehouses strategically located all over the US, you&rsquo;ll receive your order in just a few days.<\/p>\n\n\n\n<p>No good can come from waiting too long before replacing a bad blower motor relay. Browse our collection of high-quality parts, and place your order today!<\/p>\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\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>The blower motor is an important part of your vehicle&rsquo;s air-conditioning system. It&rsquo;s responsible for pushing air into the cabin&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/blower-motor-relay-function-causes-of-failure-and-replacement-cost\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1651,"featured_media":82040,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":true,"_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":[],"ppma_author":[2607,2985],"class_list":{"0":"post-82039","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":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Blower Motor Relay: Function, Causes of Failure, and Replacement Cost - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Curious about the purpose of a vehicle\u2019s blower motor relay? Learn about its function and more in this article.\" \/>\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\/blower-motor-relay-function-causes-of-failure-and-replacement-cost\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Blower Motor Relay: Function, Causes of Failure, and Replacement Cost - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Curious about the purpose of a vehicle\u2019s blower motor relay? Learn about its function and more in this article.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/blower-motor-relay-function-causes-of-failure-and-replacement-cost\/\" \/>\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=\"2023-03-24T01:49:26+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-05-27T01:47:12+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/03\/automotive-blower-motor-relay.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"1000\" \/>\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=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/blower-motor-relay-function-causes-of-failure-and-replacement-cost\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/blower-motor-relay-function-causes-of-failure-and-replacement-cost\\\/\"},\"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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