{"id":89187,"date":"2023-08-14T16:41:35","date_gmt":"2023-08-14T23:41:35","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=89187"},"modified":"2023-11-02T20:11:49","modified_gmt":"2023-11-03T03:11:49","slug":"where-is-the-a-c-low-pressure-switch-located","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/where-is-the-a-c-low-pressure-switch-located\/","title":{"rendered":"Where Is the A\/C Low-Pressure Switch Located?"},"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\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_6818b4-f4 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_6818b4-f4 > .kt-inside-inner-col,.kadence-column_6818b4-f4 > .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_6818b4-f4 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_6818b4-f4 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_6818b4-f4 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_6818b4-f4 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_6818b4-f4{position:relative;}@media all and (max-width: 1024px){.kadence-column_6818b4-f4 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_6818b4-f4 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_6818b4-f4 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-3474a5  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-234ef2\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_39b5f8-9f, .wp-block-kadence-advancedheading.kt-adv-heading_39b5f8-9f[data-kb-block=\"kb-adv-heading_39b5f8-9f\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_39b5f8-9f mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_39b5f8-9f[data-kb-block=\"kb-adv-heading_39b5f8-9f\"] 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_39b5f8-9f img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_39b5f8-9f[data-kb-block=\"kb-adv-heading_39b5f8-9f\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_39b5f8-9f summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_39b5f8-9f\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>The A\/C low-pressure switch is usually on one of the air conditioning pipes attached to the A\/C compressor&rsquo;s sides.<\/li><li>These switches help prevent compressor damage.<\/li><li>You can use a scan tool while the A\/C is running to diagnose issues with the low-pressure switch.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Q: Where Is the A\/C Low-Pressure Switch Typically Located?<\/h2>\n\n\n\n<p><strong>A:<\/strong> <strong>The A\/C low-pressure switch is usually on one of the <a href=\"https:\/\/www.carparts.com\/a-c-pipe\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"air conditioning pipes\">air conditioning pipes<\/a> that&rsquo;s attached to each side of the A\/C compressor. The low-pressure side is typically the one with the smaller pipe.<\/strong><\/p>\n\n\n\n<p><a href=\"https:\/\/www.carparts.com\/hvac-pressure-switch\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"A\/C high pressure switches\">A\/C high pressure switches<\/a> are typically used to prevent <a href=\"https:\/\/www.carparts.com\/a-c-compressor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"compressor\">compressor<\/a> damage.<\/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\/09\/illustration-of-ac-low-pressure-switch-location-1024x649.jpg\" alt=\"illustration of ac low pressure switch location\" class=\"wp-image-93475\" width=\"1024\" height=\"649\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/09\/illustration-of-ac-low-pressure-switch-location-1024x649.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/09\/illustration-of-ac-low-pressure-switch-location-300x190.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/09\/illustration-of-ac-low-pressure-switch-location-768x487.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/09\/illustration-of-ac-low-pressure-switch-location-1536x973.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/09\/illustration-of-ac-low-pressure-switch-location-150x95.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/09\/illustration-of-ac-low-pressure-switch-location.jpg 1600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>The A\/C low-pressure switch cycles the compressor to prevent evaporator icing. Usually, the low pressure switch (see illustration) will signal the compressor to disengage at about 25 psi of low side pressure and will re-engage the compressor at about 45 psi. On a hot day the low pressure switch may very seldom cycle the compressor due to higher refrigerant pressures unless the refrigerant is low. | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n<style>.kadence-column_1747db-0f > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_1747db-0f > .kt-inside-inner-col,.kadence-column_1747db-0f > .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_1747db-0f > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_1747db-0f > .kt-inside-inner-col{flex-direction:column;}.kadence-column_1747db-0f > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_1747db-0f > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_1747db-0f{position:relative;}@media all and (max-width: 1024px){.kadence-column_1747db-0f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_1747db-0f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_1747db-0f kb-section-dir-vertical kb-section-sm-dir-vertical pro-tip-widget\"><div class=\"kt-inside-inner-col\"><style>#kt-layout-id_c14ec2-c8 > .kt-row-column-wrap{align-content:start;}:where(#kt-layout-id_c14ec2-c8 > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}#kt-layout-id_c14ec2-c8 > .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_c14ec2-c8 > .kt-row-layout-overlay{opacity:0.00;}#kt-layout-id_c14ec2-c8 .kt-row-layout-bottom-sep{height:100px;}#kt-layout-id_c14ec2-c8 .kt-row-layout-bottom-sep svg{width:100%;}#kt-layout-id_c14ec2-c8 .kt-row-layout-bottom-sep svg{fill:#ffffff!important;}#kt-layout-id_c14ec2-c8 .kt-row-layout-top-sep{height:100px;}#kt-layout-id_c14ec2-c8 .kt-row-layout-top-sep svg{width:100%;}#kt-layout-id_c14ec2-c8 .kt-row-layout-top-sep svg{fill:#ffffff!important;}@media all and (max-width: 1024px){#kt-layout-id_c14ec2-c8 > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr) minmax(0, 2fr);}}@media all and (max-width: 1024px){#kt-layout-id_c14ec2-c8 .kt-row-layout-bottom-sep{height:px;}}@media all and (max-width: 1024px){#kt-layout-id_c14ec2-c8 .kt-row-layout-bottom-sep svg{width:%;}}@media all and (max-width: 767px){#kt-layout-id_c14ec2-c8 > .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_c14ec2-c8 .kt-row-layout-bottom-sep{height:px;}#kt-layout-id_c14ec2-c8 .kt-row-layout-bottom-sep svg{width:%;}}<\/style>\n<div class=\"wp-block-kadence-rowlayout alignnone pro-tip-wrap\"><div id=\"kt-layout-id_c14ec2-c8\" class=\"kt-row-layout-inner kt-layout-id_c14ec2-c8\"><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_5e0010-14 > .kt-inside-inner-col{display:flex;}.kadence-column_5e0010-14 > .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_5e0010-14 > .kt-inside-inner-col,.kadence-column_5e0010-14 > .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_5e0010-14 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;align-items:center;}.kadence-column_5e0010-14 > .kt-inside-inner-col > *, .kadence-column_5e0010-14 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_5e0010-14 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_5e0010-14 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}.kadence-column_5e0010-14 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_5e0010-14{position:relative;}@media all and (max-width: 1024px){.kadence-column_5e0010-14 > .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_5e0010-14 > .kt-inside-inner-col > *, .kadence-column_5e0010-14 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_5e0010-14 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_5e0010-14 > .kt-inside-inner-col > .kb-image-is-ratio-size{flex-grow:1;}}@media all and (max-width: 767px){.kadence-column_5e0010-14 > .kt-inside-inner-col{flex-direction:row;flex-wrap:wrap;justify-content:flex-start;}.kadence-column_5e0010-14 > .kt-inside-inner-col > *, .kadence-column_5e0010-14 > .kt-inside-inner-col > figure.wp-block-image, .kadence-column_5e0010-14 > .kt-inside-inner-col > figure.wp-block-kadence-image{margin-top:0px;margin-bottom:0px;}.kadence-column_5e0010-14 > .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_5e0010-14 kb-section-dir-horizontal kb-section-md-dir-horizontal pro-tip-item1\"><div class=\"kt-inside-inner-col\"><style>.kb-image_3ca967-5d.kb-image-is-ratio-size, .kb-image_3ca967-5d .kb-image-is-ratio-size{max-width:45px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image_3ca967-5d.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image_3ca967-5d .kb-image-is-ratio-size{align-self:unset;}.kb-image_3ca967-5d figure{max-width:45px;}.kb-image_3ca967-5d .image-is-svg, .kb-image_3ca967-5d .image-is-svg img{width:100%;}.kb-image_3ca967-5d .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image_3ca967-5d\"><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_7e6510-3a > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_7e6510-3a > .kt-inside-inner-col,.kadence-column_7e6510-3a > .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_7e6510-3a > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_7e6510-3a > .kt-inside-inner-col{flex-direction:column;}.kadence-column_7e6510-3a > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_7e6510-3a > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_7e6510-3a{position:relative;}@media all and (max-width: 1024px){.kadence-column_7e6510-3a > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_7e6510-3a > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-2 kadence-column_7e6510-3a 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>\nOn cold days even if the refrigerant isn&rsquo;t low, the compressor will cycle because when it comes to refrigerant, low ambient temperature means lower pressure.\n        <\/p>\n    <\/div>\n<\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n<p>The low pressure switch will be mounted on the accumulator or somewhere between the accumulator and the compressor on the suction line, where the refrigerant is a low pressure gas.<\/p>\n\n\n\n<p>On the other hand, the high-pressure switch prevents excessive refrigerant pressure buildup that can damage the compressor. Sometimes the high pressure switch is built into the compressor (as on older platforms) but more often it&rsquo;ll be on the discharge line between the compressor and the condenser where the refrigerant is a high pressure gas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tips on How to Access the A\/C Low-Pressure Switch<\/h2>\n\n\n\n<p>On newer vehicles, using a <a href=\"https:\/\/www.carparts.com\/scan-tool\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"scan tool\">scan tool<\/a> while the air conditioning system is running is one of the fastest ways to diagnose problems with the A\/C low-pressure switch. But if you don&rsquo;t have a scan tool, you can still assess the pressure switch manually using an A\/C pressure gauge set.<\/p>\n\n\n\n<p>Also, still on newer vehicles, there will also typically be a transducer rather than a switch that will report actual refrigerant pressures to the ECM\/PCM or the A\/C amplifier.<\/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<p>If the low pressure switch sticks closed, the evaporator will become a block of ice and airflow will cease. If the pressure switch fails open, the compressor won&rsquo;t engage even if the refrigerant level is as it should be.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>If the low pressure switch sticks closed, the evaporator will become a block of ice and airflow will cease.<\/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>In closing, recognize that low pressure cutout switches are typically used only on fixed orifice systems, since the expansion valve on TXV systems does the same job the low pressure cutout switch does, except that it regulates refrigerant flow through the evaporator based on suction line temperature.<\/p>\n\n\n\n<p>Some systems have an evaporator temperature switch or sensor for the same reason and will cycle the compressor.<\/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\"> 3<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Q: Where Is the A\/C Low-Pressure Switch Typically Located? A: The A\/C low-pressure switch is usually on one of the&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/where-is-the-a-c-low-pressure-switch-located\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":89229,"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":[1175,3909,3908],"ppma_author":[2607,2985],"class_list":{"0":"post-89187","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-a-c-compressor-2","10":"tag-a-c-pipe","11":"tag-hvac-pressure-switch","12":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Where Is the A\/C Low-Pressure Switch Located? - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Where is the A\/C low-pressure switch usually located? 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