{"id":83985,"date":"2023-05-25T02:25:03","date_gmt":"2023-05-25T09:25:03","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=83985"},"modified":"2023-10-03T19:52:23","modified_gmt":"2023-10-04T02:52:23","slug":"symptoms-of-a-bad-a-c-compressor-relay","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/symptoms-of-a-bad-a-c-compressor-relay\/","title":{"rendered":"Symptoms of a Bad A\/C Compressor Relay"},"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-column_cdc995-30 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_cdc995-30 > .kt-inside-inner-col,.kadence-column_cdc995-30 > .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-column_cdc995-30 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_cdc995-30 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_cdc995-30 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_cdc995-30 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_cdc995-30{position:relative;}@media all and (max-width: 1024px){.kadence-column_cdc995-30 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_cdc995-30 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_cdc995-30 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-8ee108  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-31721d\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_c695c0-ca, .wp-block-kadence-advancedheading.kt-adv-heading_c695c0-ca[data-kb-block=\"kb-adv-heading_c695c0-ca\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_c695c0-ca mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_c695c0-ca[data-kb-block=\"kb-adv-heading_c695c0-ca\"] 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-heading_c695c0-ca img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_c695c0-ca[data-kb-block=\"kb-adv-heading_c695c0-ca\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_c695c0-ca summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_c695c0-ca\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The A\/C compressor relays is responsible for powering the A\/C compressor and clutch.<\/li><li>P0645 is a diagnostic trouble code that may be set due to a bad A\/C compressor relay.<\/li><li>Common symptoms of failure include an A\/C that doesn&rsquo;t work, a blinking A\/C light, and clicking noises.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The last thing you want on a hot day is to notice that your car&rsquo;s air conditioning (A\/C) <a href=\"https:\/\/www.carparts.com\/a-c-compressor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"compressor\">compressor<\/a> won&rsquo;t turn on. There can be multiple reasons the A\/C won&rsquo;t cool, but this article focuses on the A\/C compressor clutch relay.<\/p>\n\n\n\n<p>If the relay is defective, the electromagnetic clutch can&rsquo;t activate. If, for some reason the A\/C relay has failed to engage the compressor clutch and nothing else is wrong but the relay, you may notice the following symptoms:<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A\/C Not Cooling or Freezing Up<\/h2>\n\n\n\n<p>The most obvious symptom of a faulty <a href=\"https:\/\/www.carparts.com\/a-c-compressor-control-relay\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"A\/C compressor relay\">A\/C compressor relay<\/a> is that your <a href=\"https:\/\/www.carparts.com\/blog\/car-a-c-not-cooling-5-reasons-why\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"A\/C won&rsquo;t function normally\">A\/C won&rsquo;t function normally<\/a>. In fact, in most cases, your A\/C will stop cooling entirely. Nothing but warm or room-temperature air will be dispensed.<\/p>\n\n\n\n<p>If you turn on the A\/C and the compressor doesn&rsquo;t spin, the relay is usually an easy place to start, even though the cause of a non-engaging compressor isn&rsquo;t typically due to a faulty relay. But here&rsquo;s how you can check to see if the relay may be the issue:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/diagram-where-ac-is-switched-on-and-the-clutch-coil-is-energized-1024x822.jpg\" alt=\"diagram where ac is switched on and the clutch coil is energized\" class=\"wp-image-86075\" width=\"1024\" height=\"822\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/diagram-where-ac-is-switched-on-and-the-clutch-coil-is-energized-1024x822.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/diagram-where-ac-is-switched-on-and-the-clutch-coil-is-energized-300x241.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/diagram-where-ac-is-switched-on-and-the-clutch-coil-is-energized-768x616.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/diagram-where-ac-is-switched-on-and-the-clutch-coil-is-energized-1536x1233.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/diagram-where-ac-is-switched-on-and-the-clutch-coil-is-energized-150x120.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/diagram-where-ac-is-switched-on-and-the-clutch-coil-is-energized.jpg 1600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption><strong>Pro Tip:<\/strong> In the diagram, you&rsquo;ll notice that when the A\/C is switched on and the clutch coil is energized, you should have 2 powers and 2 grounds. If you have 2 powers and 2 grounds at the socket with the relay removed but the A\/C clutch doesn&rsquo;t energize, the relay is probably not working. Note that just because the relay &ldquo;clicks&rdquo; it might still be bad and not feed power to the compressor. | Image Source: Richard McCuistian.<\/figcaption><\/figure>\n\n\n\n<p>If your A\/C unit bounces between blowing out cool air and releasing warm air, it might be freezing up. This intermittent cooling is often the result of ice forming in the system after air and moisture has built up.<\/p>\n\n\n\n<p>A bad A\/C compressor relay could be the culprit in both cases. The relay is part of the electrical circuit of the compressor, and anything that goes wrong here spells disaster for your A\/C.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Blinking A\/C Light<\/h2>\n\n\n\n<p>A blinking A\/C light means that the clutch on the <a href=\"https:\/\/www.carparts.com\/blog\/bad-a-c-compressor-symptoms-diagnosis-replacement-cost\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"A\/C compressor isn&rsquo;t spinning\">A\/C compressor isn&rsquo;t spinning<\/a>. This doesn&rsquo;t immediately indicate that the relay is to blame, but the relay is part of the system that keeps the compressor turning.<\/p>\n\n\n\n<p>This feature isn&rsquo;t available on all vehicles, but it&rsquo;ll help you know right away that something&rsquo;s wrong.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A\/C Compressor Not Spinning<\/h2>\n\n\n\n<p>If the A\/C relay isn&rsquo;t functioning, the compressor might not turn at all, meaning the clutch doesn&rsquo;t open and you get no cool air even when the A\/C 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<h2 class=\"wp-block-heading\">Clicking Noises<\/h2>\n\n\n\n<p>Clicking noises are normal whenever the A\/C&rsquo;s cooling cycles turn the compressor on and off. However, if you hear clicking outside of this normal cycle, that means the A\/C relay or part of the A\/C controls are malfunctioning.<\/p>\n\n\n\n<p>The lack of clicking noises is also a cause for concern if you have your A\/C on. No clicking noises means that the car&rsquo;s A\/C compressor isn&rsquo;t switching on and off at all, which it should be doing to follow the cooling cycles.<\/p>\n\n\n<style>.kadence-column_7b20c0-55 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_7b20c0-55 > .kt-inside-inner-col,.kadence-column_7b20c0-55 > .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-column_7b20c0-55 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_7b20c0-55 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_7b20c0-55 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_7b20c0-55 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_7b20c0-55{position:relative;}@media all and (max-width: 1024px){.kadence-column_7b20c0-55 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_7b20c0-55 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_7b20c0-55 kb-section-dir-vertical kb-section-sm-dir-vertical pro-tip-widget\"><div class=\"kt-inside-inner-col\"><style>#kt-layout-id_6fe8c4-53 > .kt-row-column-wrap{align-content:start;}:where(#kt-layout-id_6fe8c4-53 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}#kt-layout-id_6fe8c4-53 > .kt-row-column-wrap{column-gap:var(--global-kb-gap-none, 0rem );row-gap:var(--global-kb-gap-md, 2rem);padding-top:var( --global-kb-row-default-top, 25px );padding-bottom:var( --global-kb-row-default-bottom, 25px );padding-top:20px;padding-bottom:20px;padding-left:16px;padding-right:32px;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)));}#kt-layout-id_6fe8c4-53 > .kt-row-layout-overlay{opacity:0.00;}#kt-layout-id_6fe8c4-53 .kt-row-layout-bottom-sep{height:100px;}#kt-layout-id_6fe8c4-53 .kt-row-layout-bottom-sep svg{width:100%;}#kt-layout-id_6fe8c4-53 .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}#kt-layout-id_6fe8c4-53 .kt-row-layout-top-sep{height:100px;}#kt-layout-id_6fe8c4-53 .kt-row-layout-top-sep svg{width:100%;}#kt-layout-id_6fe8c4-53 .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){#kt-layout-id_6fe8c4-53 > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){#kt-layout-id_6fe8c4-53 .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){#kt-layout-id_6fe8c4-53 .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){#kt-layout-id_6fe8c4-53 > .kt-row-column-wrap{padding-top:28px;padding-bottom:25px;padding-left:16px;padding-right:16px;grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}#kt-layout-id_6fe8c4-53 .kt-row-layout-bottom-sep{height:px;}#kt-layout-id_6fe8c4-53 .kt-row-layout-bottom-sep svg{width:%;}}<\/style>\n<div class=\"wp-block-kadence-rowlayout alignnone pro-tip-wrap\"><div id=\"kt-layout-id_6fe8c4-53\" class=\"kt-row-layout-inner kt-layout-id_6fe8c4-53\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-gutter-none kt-v-gutter-default kt-row-valign-top kt-row-layout-right-golden kt-tab-layout-right-golden kt-m-colapse-left-to-right kt-mobile-layout-right-golden  kt-custom-first-width-10  kt-custom-second-width-90\"><style>.kadence-column_7083a1-37 > .kt-inside-inner-col{display:flex;}.kadence-column_7083a1-37 > .kt-inside-inner-col{min-height:45px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_7083a1-37 > .kt-inside-inner-col,.kadence-column_7083a1-37 > .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-column_7083a1-37 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column_7083a1-37 > .kt-inside-inner-col > *, .kadence-column_7083a1-37 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_7083a1-37 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_7083a1-37 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column_7083a1-37 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_7083a1-37{position:relative;}@media all and (max-width: 1024px){.kadence-column_7083a1-37 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}}@media all and (min-width: 768px) and (max-width: 1024px){.kadence-column_7083a1-37 > .kt-inside-inner-col > *, .kadence-column_7083a1-37 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_7083a1-37 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_7083a1-37 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column_7083a1-37 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column_7083a1-37 > .kt-inside-inner-col > *, .kadence-column_7083a1-37 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_7083a1-37 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_7083a1-37 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_7083a1-37 kb-section-dir-horizontal kb-section-md-dir-horizontal pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image_a0c129-91.kb-image-is-ratio-size, .kb-image_a0c129-91 .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image_a0c129-91.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image_a0c129-91 .kb-image-is-ratio-size{align-self:unset;}.kb-image_a0c129-91 figure{max-width:45px;}.kb-image_a0c129-91 .image-is-svg, .kb-image_a0c129-91 .image-is-svg img{width:100%;}.kb-image_a0c129-91 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image_a0c129-91\"><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-column_05847b-6a > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_05847b-6a > .kt-inside-inner-col,.kadence-column_05847b-6a > .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-column_05847b-6a > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_05847b-6a > .kt-inside-inner-col{flex-direction:column;}.kadence-column_05847b-6a > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_05847b-6a > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_05847b-6a{position:relative;}@media all and (max-width: 1024px){.kadence-column_05847b-6a > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_05847b-6a > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-2 kadence-column_05847b-6a 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>\n            <span>If the A\/C is &ldquo;short-cycling&rdquo; and it&rsquo;s a hot day, the system may just be low on refrigerant. This won&rsquo;t have anything to do with the relay.<\/span>\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">P0645<\/h2>\n\n\n\n<p>A bad A\/C compressor relay is a common cause for <a href=\"https:\/\/www.carparts.com\/blog\/p0645-code-a-c-clutch-relay-control-circuit\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Diagnostic Trouble Code\">Diagnostic Trouble Code<\/a> (DTC) P0645 on some platforms. This code means &ldquo;A\/C Clutch Relay Control Circuit.&rdquo; This typically refers to the primary or trigger side of the A\/C relay or its circuit. The secondary side is the load-carrying part of the relay.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/ac-compressor-relay-diagram-and-actual-photo-1024x774.jpg\" alt=\"ac compressor relay diagram and actual photo\" class=\"wp-image-86076\" width=\"1024\" height=\"774\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/ac-compressor-relay-diagram-and-actual-photo-1024x774.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/ac-compressor-relay-diagram-and-actual-photo-300x227.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/ac-compressor-relay-diagram-and-actual-photo-768x580.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/ac-compressor-relay-diagram-and-actual-photo-1536x1161.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/ac-compressor-relay-diagram-and-actual-photo-150x113.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/ac-compressor-relay-diagram-and-actual-photo.jpg 1600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>A\/C compressor relay diagram and actual photo | Image Source: Richard McCuistian.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Does the A\/C Compressor Relay Fail Often?<\/h2>\n\n\n\n<p>The A\/C compressor relay is controlled by the PCM and when the PCM triggers the A\/C relay to close, the power that energizes the compressor clutch is delivered by the secondary load carrying terminals. When the relay tells the compressor&rsquo;s magnetic clutch to activate, the clutch hub is pulled against the spinning pulley that is driven by the belt. Since the hub is connected to the compressor shaft, snapping it hard against the spinning pulley will cause the pulley to drive the compressor by way of the hub and its shaft. This drives the inside of the compressor where the important work is done.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>The A\/C compressor relay is controlled by the PCM and when the PCM triggers the A\/C relay to close, the power that energizes the compressor clutch is delivered by the secondary load carrying terminals.<\/p><cite><em>&ndash;&nbsp;<\/em><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><strong>The truth is the relay is very seldom the problem. Usually, the relay is only doing what it&rsquo;s commanded to do, and there are many reasons why the PCM might not engage the relay.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Much Does a Replacement A\/C Compressor Relay Cost?<\/h2>\n\n\n\n<p>Depending on the model of your vehicle&rsquo;s sources, the cost of a replacement A\/C compressor relay ranges from $10 to 150. For certain cars, a multi-purpose relay will do the trick just fine. Others, however, might need a specific relay to work with their system. To be safe, consult a mechanic or your vehicle&rsquo;s manual before making a purchase.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where Is the A\/C Compressor Relay Located?<\/h2>\n\n\n\n<p>The A\/C compressor relay is located in the engine compartment along with a bunch of other fuses and relays. The cover of the engine compartment usually has a guide to tell you which fuse or relay does what. The A\/C compressor relay can be found by searching for the anagram MGCLT, which stands for Magnetic Clutch Relay.<\/p>\n\n\n\n<p>At the end of the day, a bad compressor relay can cause a lot of problems with your A\/C system. It&rsquo;s the one of the first things you should check whenever your car&rsquo;s compressor won&rsquo;t turn on.<\/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 last thing you want on a hot day is to notice that your car&rsquo;s air conditioning (A\/C) compressor won&rsquo;t&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/symptoms-of-a-bad-a-c-compressor-relay\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":84210,"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":[3753,52],"tags":[3787],"ppma_author":[2607,2985],"class_list":{"0":"post-83985","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-cooling-system","8":"category-diy","9":"tag-a-c-compressor-control-relay","10":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Symptoms of a Bad A\/C Compressor Relay - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"When your car\u2019s A\/C compressor isn\u2019t turning on, you know you\u2019re in for an uncomfortable drive. 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