{"id":40221,"date":"2021-06-18T00:08:27","date_gmt":"2021-06-18T07:08:27","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=40221"},"modified":"2024-01-27T06:02:40","modified_gmt":"2024-01-27T14:02:40","slug":"how-a-heater-control-valve-works-with-diagram","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/how-a-heater-control-valve-works-with-diagram\/","title":{"rendered":"How a Heater Control Valve Works (with Diagram)"},"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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_2b4cc7-b4 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_2b4cc7-b4 > .kt-inside-inner-col,.kadence-column_2b4cc7-b4 > .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_2b4cc7-b4 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_2b4cc7-b4 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_2b4cc7-b4 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_2b4cc7-b4 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_2b4cc7-b4{position:relative;}@media all and (max-width: 1024px){.kadence-column_2b4cc7-b4 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_2b4cc7-b4 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_2b4cc7-b4 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-5627e1  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-07c520\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_717a08-fd, .wp-block-kadence-advancedheading.kt-adv-heading_717a08-fd[data-kb-block=\"kb-adv-heading_717a08-fd\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_717a08-fd mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_717a08-fd[data-kb-block=\"kb-adv-heading_717a08-fd\"] 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_717a08-fd img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_717a08-fd[data-kb-block=\"kb-adv-heading_717a08-fd\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_717a08-fd summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_717a08-fd\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>Heater control valves control the flow of coolant through the heater core.<\/li><li>The most common signs of a faulty heater control valve include inoperative heaters and coolant leaks.<\/li><li>The location of the heater control valve varies from vehicle to vehicle, but it can typically be found with the heater core&rsquo;s inlet hose.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>When the temperature outside begins to drop, it&rsquo;s important to have a functional heater inside of your car. On some vehicles, a component called the heater control valve plays a vital role in heater operation&mdash;and keeping your cabin warm.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Does a Heater Control Valve Work?<\/h2>\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\/2021\/06\/heater-control-valve-diagram-1024x614.png\" alt=\"heater control valve diagram\" class=\"wp-image-40223\" width=\"1024\" height=\"614\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/heater-control-valve-diagram-1024x614.png 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/heater-control-valve-diagram-300x180.png 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/heater-control-valve-diagram-768x461.png 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/heater-control-valve-diagram-1536x922.png 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/heater-control-valve-diagram.png 2048w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/heater-control-valve-diagram-150x90.png 150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption><em>An example of a heater control valve diagram<\/em>.<\/figcaption><\/figure>\n\n\n\n<p>Some vehicles (mostly older models) have a heater control valve. As its name implies, the heater control valve controls the flow of coolant through the heater core.&nbsp;<\/p>\n\n\n\n<p>To have a better understanding of the heater control valve, it&rsquo;s important to first know how your car&rsquo;s heater works.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How Your Car&rsquo;s Heater Works&nbsp;<\/h3>\n\n\n\n<p>Your car&rsquo;s heater relies on hot coolant&mdash;from the engine&rsquo;s cooling system&mdash;to warm the cabin. A typical cooling system has four primary components: the <a href=\"https:\/\/www.carparts.com\/water-pump\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"water pump\">water pump<\/a>, <a href=\"https:\/\/www.carparts.com\/radiator\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"radiator\">radiator<\/a>, <a href=\"https:\/\/www.carparts.com\/thermostat\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"thermostat\">thermostat<\/a>, and <a href=\"https:\/\/www.carparts.com\/heater-core\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"heater core\">heater core<\/a>.&nbsp;<\/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\/2021\/06\/car-front-revealing-large-radiator-and-intercooler-1024x654.jpg\" alt=\"car front revealing large radiator and intercooler\" class=\"wp-image-40226\" width=\"1024\" height=\"654\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/car-front-revealing-large-radiator-and-intercooler-1024x654.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/car-front-revealing-large-radiator-and-intercooler-300x192.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/car-front-revealing-large-radiator-and-intercooler-768x491.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/car-front-revealing-large-radiator-and-intercooler-1536x982.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/car-front-revealing-large-radiator-and-intercooler-150x96.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/car-front-revealing-large-radiator-and-intercooler.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>A typical cooling system has four primary components: the water pump, radiator, thermostat, and heater core.<\/figcaption><\/figure>\n\n\n\n<p>When the vehicle is running, the engine-driven water pump moves coolant through the engine (where the coolant picks up heat) and toward the thermostat. The thermostat blocks coolant flow to the radiator until the engine reaches operating temperature. Then, the thermostat opens, allowing coolant to flow from the engine to the radiator. After being cooled in the radiator, the coolant returns to the water pump to repeat the cycle.&nbsp;<\/p>\n\n\n\n<p>The water pump also forces hot coolant through the heater core during the cooling system&rsquo;s cycle. A pair of hoses connect the heater core to the cooling system. When the driver turns on the climate control system&rsquo;s fan, a <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\">blower motor<\/a> forces air across the heater core, transferring heat into the cabin.<\/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\/2021\/06\/car-water-pump-in-focus-1024x682.jpg\" alt=\"car water pump in focus\" class=\"wp-image-40227\" width=\"1024\" height=\"682\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/car-water-pump-in-focus-1024x682.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/car-water-pump-in-focus-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/car-water-pump-in-focus-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/car-water-pump-in-focus-1536x1024.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/car-water-pump-in-focus-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/car-water-pump-in-focus-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/car-water-pump-in-focus.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>When the vehicle is running, the engine-driven water pump moves coolant through the engine and toward the thermostat.<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">The Role of the Heater Control Valve&nbsp;<\/h3>\n\n\n\n<p>On most vehicles, coolant flows through the heater core whenever the water pump is turning. A blend door, which routes airflow toward or away from the heater core, regulates the temperature of the heat coming out of the vents.&nbsp;<\/p>\n\n\n\n<p>But there are also some vehicles that use a heater control valve to manage the flow of coolant through the heater core. Depending on the system design, the heater control valve may be normally closed (blocking coolant flow until activated) or normally open (allowing coolant flow until activated).&nbsp;<\/p>\n\n\n\n<p>Some heater control valves are operated via a cable or engine vacuum, while others are electronically controlled.&nbsp;<\/p>\n\n\n\n<p>The video below further discusses heater control valve operation:<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Automotive HVAC Heater Repair\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/16aLPuGMII4?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How Do I Know If My Heater Control Valve is Bad?<\/h2>\n\n\n\n<p>An inoperative heater is the most common sign of a faulty heater control valve. Heater control valves can also develop <a href=\"https:\/\/www.carparts.com\/blog\/coolant-leak-symptoms-plus-faq\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"coolant leaks\">coolant leaks<\/a>. Of course, other faulty components can produce the same symptoms, so you&rsquo;ll want to test the heater control valve to ensure it&rsquo;s to blame.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How Do You Test a Heater Control Valve?&nbsp;<\/h3>\n\n\n\n<p>Do you suspect your car&rsquo;s heater control valve might be faulty? To be sure, you&rsquo;ll want to perform a thorough diagnosis before replacing the valve.<\/p>\n\n\n\n<p><strong>Note:<\/strong> The method for testing the valve will vary, depending on the system design. So, it&rsquo;s a good idea to consult a <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"repair manual or repair database\">repair manual or repair database<\/a> before you begin testing.&nbsp;<\/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>Begin by performing a visual inspection of the valve, looking for leaks and other obvious signs of damage. If everything looks okay, you&rsquo;ll want to move on to checking the temperature of the valve&rsquo;s inlet and outlet hoses by doing the following:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Bring the engine up to operating temperature and switch the heater to the hottest setting.&nbsp;<\/li><li>Check the temperature of the valve&rsquo;s outlet hose (between the valve and the heater core)&mdash;it should feel nearly as hot as the valve&rsquo;s inlet hose.&nbsp;&nbsp;<\/li><li>If the outlet hose is noticeably cooler than the inlet hose, the valve is likely stuck closed, preventing coolant from circulating through the heater core.<\/li><\/ul>\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\/2021\/06\/Replacement-Heater-Valve-1024x637.jpg\" alt=\"Replacement Heater Valve\" class=\"wp-image-40225\" width=\"1024\" height=\"637\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/Replacement-Heater-Valve-1024x637.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/Replacement-Heater-Valve-300x186.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/Replacement-Heater-Valve-768x477.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/Replacement-Heater-Valve-1536x955.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/Replacement-Heater-Valve-150x93.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/Replacement-Heater-Valve.jpg 1850w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>The method for testing the valve will vary, depending on the system design.<\/figcaption><\/figure>\n\n\n\n<p>But before condemning the heater control valve, you&rsquo;ll want to make sure that its control system is operating properly.&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>If the valve is cable-operated, ensure that the cable operates smoothly without binding.&nbsp;<\/li><li>If the valve is vacuum-controlled, ensure that the vacuum line is properly routed and intact.<\/li><li>If the valve is electronically operated, ensure that the valve&rsquo;s control circuit is working properly.&nbsp;<\/li><\/ul>\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\/2021\/06\/Heater-Valve-Direct-Fit-1024x692.jpg\" alt=\"Heater Valve Direct Fit\" class=\"wp-image-40228\" width=\"1024\" height=\"692\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/Heater-Valve-Direct-Fit-1024x692.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/Heater-Valve-Direct-Fit-300x203.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/Heater-Valve-Direct-Fit-768x519.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/Heater-Valve-Direct-Fit-1536x1038.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/Heater-Valve-Direct-Fit-150x101.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/Heater-Valve-Direct-Fit.jpg 1850w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Perform a visual inspection of the valve by looking for leaks and other obvious signs of damage.<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Heater Control Valve Location<\/h3>\n\n\n\n<p>The heater control valve is typically in line with the heater core&rsquo;s inlet hose, which is often near the vehicle&rsquo;s firewall, but the exact location of the valve will vary by vehicle. To determine the location of your car&rsquo;s valve (if it has one), it&rsquo;s a good idea to consult a repair manual or repair database.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can You Bypass a Heater Control Valve?&nbsp;<\/h3>\n\n\n\n<p>Some people opt to bypass a faulty heater control valve rather than replace it. Unfortunately, bypassing the valve can cause several issues.&nbsp;<\/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\/2021\/06\/mechanic-performs-hood-inspection-1024x683.jpg\" alt=\"mechanic performs hood inspection\" class=\"wp-image-40229\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/mechanic-performs-hood-inspection-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/mechanic-performs-hood-inspection-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/mechanic-performs-hood-inspection-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/mechanic-performs-hood-inspection-1536x1025.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/mechanic-performs-hood-inspection-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/mechanic-performs-hood-inspection-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/mechanic-performs-hood-inspection.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Bypassing the heater control valve is not a good idea because the modification compromises the cooling system&rsquo;s integrity.<\/figcaption><\/figure>\n\n\n\n<p>If the valve is removed and the hose is connected directly to the heater core, hot coolant will be running through the core all of the time, potentially resulting in climate control performance problems. On the other hand, if the valve and heater core are both bypassed, the vehicle&rsquo;s heater will be inoperative.&nbsp;<\/p>\n\n\n\n<p>In either scenario, bypassing the heater control valve is not a good idea because the modification compromises the cooling system&rsquo;s integrity. Because heater control valves are generally fairly affordable and easy to replace, your best bet is to replace the valve rather than bypass it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Getting a Replacement Heater Control Valve for Your Vehicle<\/h2>\n\n\n\n<p>If you&rsquo;ve determined that a bad <a href=\"https:\/\/www.carparts.com\/heater-valve\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"heater valve\">heater valve<\/a> is causing problems for your vehicle, don&rsquo;t delay resolving it. Otherwise, dealing with uncomfortable cabin temperatures might become the norm whenever you hit the road. Luckily, you can get a replacement in no time at <a href=\"https:\/\/www.carparts.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"CarParts.com\">CarParts.com<\/a>.<\/p>\n\n\n\n<p>We want to give you the best value for your money. That&rsquo;s why our high-quality heater control valves come at competitive prices. Besides sourcing them from top aftermarket brands, our industry experts also handpicked them to ensure they&rsquo;re built to last.<\/p>\n\n\n\n<p>The best part? You can get your hands on a new heater control valve without ever leaving your house. You can access our website on your mobile device and computer. Use our vehicle selector and filters to find the parts that fit your daily driver and match your preferred brand, price, and features.<\/p>\n\n\n\n<p>Shop today, and get the part you need for repairs in as fast as two business days!<\/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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>When the temperature outside begins to drop, it&rsquo;s important to have a functional heater inside of your car. On some&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/how-a-heater-control-valve-works-with-diagram\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":40224,"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":[3031],"ppma_author":[2607],"class_list":{"0":"post-40221","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-heater-valve","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>How a Heater Control Valve Works (with Diagram) - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"The heater control valve plays a vital role in heater operation. 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