{"id":81691,"date":"2023-03-09T02:13:40","date_gmt":"2023-03-09T10:13:40","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=81691"},"modified":"2025-10-23T21:18:43","modified_gmt":"2025-10-24T04:18:43","slug":"leaking-coolant-reservoir-symptoms-and-replacement-cost","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/leaking-coolant-reservoir-symptoms-and-replacement-cost\/","title":{"rendered":"Leaking Coolant Reservoir: Symptoms 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-column81691_25a964-69 > .kt-inside-inner-col,.kadence-column81691_25a964-69 > .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-column81691_25a964-69 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column81691_25a964-69 > .kt-inside-inner-col{flex-direction:column;}.kadence-column81691_25a964-69 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column81691_25a964-69 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column81691_25a964-69{position:relative;}@media all and (max-width: 1024px){.kadence-column81691_25a964-69 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column81691_25a964-69 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column81691_25a964-69 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-ca2384  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-0a959c\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading81691_bd6ad3-11, .wp-block-kadence-advancedheading.kt-adv-heading81691_bd6ad3-11[data-kb-block=\"kb-adv-heading81691_bd6ad3-11\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading81691_bd6ad3-11 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading81691_bd6ad3-11[data-kb-block=\"kb-adv-heading81691_bd6ad3-11\"] 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-heading81691_bd6ad3-11 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading81691_bd6ad3-11[data-kb-block=\"kb-adv-heading81691_bd6ad3-11\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading81691_bd6ad3-11 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading81691_bd6ad3-11\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The coolant reservoir is a container for excess engine coolant fluid.<\/li>\n\n\n\n<li>A cracked coolant reservoir displays symptoms like coolant leaks, coolant odor, low coolant levels, and the engine overheating.<\/li>\n\n\n\n<li>Coolant reservoirs are either degas tanks or surge tanks.<\/li>\n\n\n\n<li>A replacement coolant reservoir tank costs anywhere from $10 to $90.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The coolant reservoir or coolant overflow tank is an important part of your vehicle&rsquo;s cooling system. While the <a href=\"https:\/\/www.carparts.com\/radiator\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"radiator\">radiator<\/a> also stores coolant, it needs the coolant reservoir so that it can reduce the pressure when the coolant expands due to increased temperature.<\/p>\n\n\n\n<p>The coolant reservoir can fail because of several reasons. It&rsquo;s usually made of plastic, which can become brittle since it&rsquo;s regularly exposed to heat. After some time, the reservoir can also become more susceptible to vibration and pressure. If your vehicle&rsquo;s coolant reservoir has cracked, then it might show the following symptoms:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"664\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/03\/damaged-coolant-reservoir-1024x664.jpg\" alt=\"stains due to coolant leaks\" class=\"wp-image-81704\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/03\/damaged-coolant-reservoir-1024x664.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/03\/damaged-coolant-reservoir-300x195.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/03\/damaged-coolant-reservoir-768x498.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/03\/damaged-coolant-reservoir-150x97.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/03\/damaged-coolant-reservoir.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">The coolant reservoir can fail because of several reasons. It&rsquo;s usually made of plastic, which can become brittle since it&rsquo;s regularly exposed to heat.<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Coolant Leaks<\/h3>\n\n\n\n<p>If you notice that there are puddles of liquid accumulating under your vehicle, you should verify if it&rsquo;s actually <a href=\"https:\/\/www.carparts.com\/coolant-antifreeze\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"coolant\">coolant<\/a> and not water from your vehicle&rsquo;s air-conditioning system. Leaking coolant can be an early sign of a cracked coolant reservoir. Spotting this symptom immediately can prevent worse issues down the line.<\/p>\n\n\n\n<p>Remember that coolant is toxic since it&rsquo;s a mix of glycol and water. If you spot a <a href=\"https:\/\/www.carparts.com\/blog\/coolant-leak-symptoms-plus-faq\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"coolant leak\">coolant leak<\/a>, clean it immediately to prevent your pets from ingesting the compound. Coolant is also considered hazardous waste, so it should be <a href=\"https:\/\/www.carparts.com\/blog\/how-do-i-get-rid-of-my-cars-contaminated-coolant\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"thrown away in a sealed container\">thrown away in a sealed container<\/a> and sent to service centers or auto repair shops.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Coolant Odor<\/h3>\n\n\n\n<p>Coolant smells sweet when it&rsquo;s exposed to air or when it burns, so check for leaks if you smell something sweet around your vehicle.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Low Coolant Level<\/h3>\n\n\n\n<p>If your engine&rsquo;s temperature is abnormally high, even though it isn&rsquo;t overheating, it could be a sign that your radiator might be running low on coolant. While your vehicle does need coolant refills every now and then, frequent coolant refills can be a sign of a ruptured coolant reservoir.<\/p>\n\n\n\n<p>You can have a leaking coolant reservoir without noticing other signs because the crack can be small, which means that coolant will evaporate slowly. Knowing when your radiator&rsquo;s coolant levels are dropping can be difficult since the radiator isn&rsquo;t see-through. That&rsquo;s why you should regularly check your <a href=\"https:\/\/www.carparts.com\/blog\/coolant-temperature-warning-light-meaning-causes-what-to-do\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"vehicle&rsquo;s temperature gauge\">vehicle&rsquo;s temperature gauge<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Overheating<\/h3>\n\n\n\n<p>If the coolant reservoir has leaked too much coolant, there might not be enough to keep the engine cool. When an engine&rsquo;s temperature exceeds its intended operating temperature, the engine&rsquo;s cylinders or pistons can warp and deform, causing a lot of problems. The resulting <a href=\"https:\/\/www.carparts.com\/blog\/what-type-of-damage-to-expect-from-an-overheating-car\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"engine damage\">engine damage<\/a> can be extensive, and repairing it can be quite costly.<\/p>\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\/rb603205_1\">\n  <\/div>\n  <div class=\"rsi-info\">\n    <span class=\"rsi-title\">The Best Coolant Reservoir Brands for DIYers<\/span>\n    <span class=\"rsi-desc\">Check out the best aftermarket coolant reservoir brands that offer reliable fit, strong warranties, and lasting performance.<\/span>\n    <a href=\"https:\/\/www.carparts.com\/blog\/the-best-coolant-reservoir-brands-for-diyers-quickref\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Discover Your Options\">Discover Your Options<\/a>\n  <\/div>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">Types of Coolant Reservoirs<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Degas Tank<\/h3>\n\n\n\n<p>There are two basic types of coolant reservoirs. One is a degas tank that simply stores coolant while the engine is warm and the expanding coolant is pushed past the radiator cap&rsquo;s spring-loaded seal.<\/p>\n\n\n\n<p>On this type of reservoir, as the coolant contracts while cooling, the degas bottle allows the coolant to return to the radiator through the same hose by way of the small one-way valve in the center of the radiator cap.<\/p>\n\n\n\n<p>This kind of tank isn&rsquo;t designed to hold pressure and won&rsquo;t typically cause engine damage even if it does leak.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"1000\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/degas-tank-coolant-reservoir.jpg\" alt=\"degas tank coolant reservoir\" class=\"wp-image-82548\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/degas-tank-coolant-reservoir.jpg 1000w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/degas-tank-coolant-reservoir-300x300.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/degas-tank-coolant-reservoir-768x768.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/degas-tank-coolant-reservoir-75x75.jpg 75w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/degas-tank-coolant-reservoir-600x600.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/degas-tank-coolant-reservoir-96x96.jpg 96w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/degas-tank-coolant-reservoir-150x150.jpg 150w\" sizes=\"(max-width: 1000px) 100vw, 1000px\"><figcaption class=\"wp-element-caption\">Reservoirs like this one can leak but usually don&rsquo;t unless they&rsquo;ve been physically damaged.<\/figcaption><\/figure>\n\n\n\n<p>This tank has two chambers: the left hand chamber is the coolant degas tank and the right hand chamber is for the windshield washer. Notice that the filler cap for this particular 1990s Ford pickup truck-style reservoir just snaps on and has a tether attached to keep it from getting lost. Reservoirs like this one can leak but usually don&rsquo;t unless they&rsquo;ve been physically damaged.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Surge Tank with Screw-on Filler Cap<\/h3>\n\n\n\n<p>The other type of reservoir is actually a heavy-duty pressure-holding surge tank with a robust screw-on filler cap. This type reservoir is made to hold pressure but can release it externally by way of the valves in the cap if the cooling system pressure is excessive for whatever reason.<\/p>\n\n\n\n<p>Reservoirs like this one can crack and leak. If they are not replaced when they begin to leak, the engine can be destroyed by coolant loss.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"689\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/surge-tank-with-screw-on-filler-cap-1024x689.jpg\" alt=\"surge tank with screw on filler cap\" class=\"wp-image-82547\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/surge-tank-with-screw-on-filler-cap-1024x689.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/surge-tank-with-screw-on-filler-cap-300x202.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/surge-tank-with-screw-on-filler-cap-768x517.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/surge-tank-with-screw-on-filler-cap-1536x1034.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/surge-tank-with-screw-on-filler-cap-150x101.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/04\/surge-tank-with-screw-on-filler-cap.jpg 1600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">A heavy-duty pressure-holding surge tank with a robust screw-on filler cap | Image Source: Richard McCuistian.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How Much Does a Replacement Coolant Reservoir Tank Cost?<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.carparts.com\/coolant-reservoir\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Coolant reservoir\">Coolant reservoir<\/a> tanks cost anywhere from $10 to $90 depending on their size and brand. Coolant reservoirs can also be sold with other cooling system components, such as the radiator and <a href=\"https:\/\/www.carparts.com\/cooling-fan-assembly\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"cooling fan assembly\">cooling fan assembly<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Get a Coolant Reservoir for Your Ride<\/h2>\n\n\n\n<p>Coolant reservoir leaks can take a toll on your ride&rsquo;s cooling system, resulting in issues that require wallet-draining repairs. Fortunately, if you&rsquo;re in the market for a replacement, <a href=\"http:\/\/carparts.com\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"CarParts.com\">CarParts.com<\/a> has you covered with our wide array of OE-grade coolant reservoirs.<\/p>\n\n\n\n<p>With our vehicle selector, you can narrow down our wide selection to the coolant reservoirs that are compatible with your ride. Our parts come with accurate and detailed fitment information, so you&rsquo;re sure to get exactly what your car needs to get back on the road.<\/p>\n\n\n\n<p>We source our products from reputable brands in the industry to ensure they perform just like your stock coolant reservoir. And don&rsquo;t worry about going over budget, as we offer our parts at unbeatable prices.<\/p>\n\n\n\n<p>Need a new coolant reservoir as soon as possible? We ship from strategically located warehouses across the country, so you can get your order in as fast as two business days.&nbsp;<br>Check out our <a href=\"https:\/\/www.carparts.com\/search?q=coolant_reservoir\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"coolant reservoir replacements\">coolant reservoir replacements<\/a> 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 coolant reservoir or coolant overflow tank is an important part of your vehicle&rsquo;s cooling system. While the radiator also&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/leaking-coolant-reservoir-symptoms-and-replacement-cost\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1651,"featured_media":81702,"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":[3753,52],"tags":[1247],"ppma_author":[2607,2985],"class_list":{"0":"post-81691","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-cooling-system","8":"category-diy","9":"tag-coolant-reservoir","10":"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>Leaking Coolant Reservoir: Symptoms and Replacement Cost - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"A cracked coolant reservoir can ruin your engine. Learn about the signs you should look out for 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\/leaking-coolant-reservoir-symptoms-and-replacement-cost\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Leaking Coolant Reservoir: Symptoms and Replacement Cost - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"A cracked coolant reservoir can ruin your engine. Learn about the signs you should look out for in this article.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/leaking-coolant-reservoir-symptoms-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=\"2023-03-09T10:13:40+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-24T04:18:43+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/03\/automotive-coolant-reservoir.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\\\/leaking-coolant-reservoir-symptoms-and-replacement-cost\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/leaking-coolant-reservoir-symptoms-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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