{"id":109520,"date":"2024-06-28T00:11:05","date_gmt":"2024-06-28T07:11:05","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=109520"},"modified":"2024-07-31T21:27:48","modified_gmt":"2024-08-01T04:27:48","slug":"tips-on-how-to-test-the-radiator-fan","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/tips-on-how-to-test-the-radiator-fan\/","title":{"rendered":"Tips on How to Test the Radiator Fan"},"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-column109520_b4bbc2-f3 > .kt-inside-inner-col,.kadence-column109520_b4bbc2-f3 > .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-column109520_b4bbc2-f3 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column109520_b4bbc2-f3 > .kt-inside-inner-col{flex-direction:column;}.kadence-column109520_b4bbc2-f3 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column109520_b4bbc2-f3 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column109520_b4bbc2-f3{position:relative;}@media all and (max-width: 1024px){.kadence-column109520_b4bbc2-f3 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column109520_b4bbc2-f3 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column109520_b4bbc2-f3 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-a49089  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-dc3946\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading109520_bee3c4-67, .wp-block-kadence-advancedheading.kt-adv-heading109520_bee3c4-67[data-kb-block=\"kb-adv-heading109520_bee3c4-67\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading109520_bee3c4-67 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading109520_bee3c4-67[data-kb-block=\"kb-adv-heading109520_bee3c4-67\"] 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-heading109520_bee3c4-67 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading109520_bee3c4-67[data-kb-block=\"kb-adv-heading109520_bee3c4-67\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading109520_bee3c4-67 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading109520_bee3c4-67\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>There are a few ways to test the radiator fan.<\/li>\n\n\n\n<li>You can connect the radiator fan to the car battery with jumper wires to see if the fan runs normally.<\/li>\n\n\n\n<li>You can connect a low impedance lamp in series with the motor, turn it through, and see if the lamp ever goes dark, which is the most sensible way.<\/li>\n\n\n\n<li>You can also use a multimeter to test the radiator fan but it&rsquo;s not recommended.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Is your engine&rsquo;s radiator fan not spinning when it&rsquo;s supposed to cool your vehicle&rsquo;s engine? Don&rsquo;t go shopping for a replacement <a href=\"https:\/\/www.carparts.com\/cooling-fan-assembly\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"cooling fan\">cooling fan<\/a> yet. The issue might not lie with the fan but with another part that supplies it with power or sends the activation signal. Fortunately, you can run a test on the radiator fan to determine if the part has a problem or not.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Testing Methods For the Radiator Fans<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"1059\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/standard-gm-fan-wiring-diagram.jpg\" alt=\"standard gm fan wiring diagram\" class=\"wp-image-115286\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/standard-gm-fan-wiring-diagram.jpg 1600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/standard-gm-fan-wiring-diagram-300x199.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/standard-gm-fan-wiring-diagram-1024x678.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/standard-gm-fan-wiring-diagram-768x508.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/standard-gm-fan-wiring-diagram-1536x1017.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/standard-gm-fan-wiring-diagram-150x99.jpg 150w\" sizes=\"(max-width: 1600px) 100vw, 1600px\"><figcaption class=\"wp-element-caption\">Standard GM fan wiring | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<p>There are a few methods to test the radiator fan, with varying effectiveness. You can use the car battery to test the cooling fan for issues. You can also check the fan&rsquo;s commutator for open circuits. If it stops on a &ldquo;dark&rdquo; spot, the fan won&rsquo;t run then and the problem will be intermittent.<\/p>\n\n\n\n<p>Another method is to use a <a href=\"https:\/\/www.carparts.com\/multimeter\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"multimeter\">multimeter<\/a>, but it&rsquo;s not recommended because of the amount of current a fan circuit carries.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Test Radiator Fan with the Car Battery<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"1173\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/diagram-showing-how-to-test-a-radiator-fan-with-a-car-battery.jpg\" alt=\"diagram showing how to test a radiator fan with a car battery\" class=\"wp-image-115287\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/diagram-showing-how-to-test-a-radiator-fan-with-a-car-battery.jpg 1600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/diagram-showing-how-to-test-a-radiator-fan-with-a-car-battery-300x220.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/diagram-showing-how-to-test-a-radiator-fan-with-a-car-battery-1024x751.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/diagram-showing-how-to-test-a-radiator-fan-with-a-car-battery-768x563.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/diagram-showing-how-to-test-a-radiator-fan-with-a-car-battery-1536x1126.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/diagram-showing-how-to-test-a-radiator-fan-with-a-car-battery-150x110.jpg 150w\" sizes=\"(max-width: 1600px) 100vw, 1600px\"><figcaption class=\"wp-element-caption\">Diagram showing how to test a radiator fan with a car battery | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<p>You can use the <a href=\"https:\/\/www.carparts.com\/battery\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"car battery\">car battery<\/a> to check the radiator fan. Hook up the cooling fan to the battery with jumper wires. This method lets you bypass other parts of the circuit that might affect the connection, allowing you to concentrate on the fan.<\/p>\n\n\n\n<p>Observe the radiator fan after you connect it to the car battery. If it starts to spin immediately and steadily without making any strange noises, then it&rsquo;s probably fine. The issue probably lies with other parts, such as the fuses, relays, connectors, and wires.<\/p>\n\n\n\n<p><strong>Pro Tip:<\/strong> <em>With a light connected in series, you can find intermittent fan issues. This is very common.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Should You Test the Radiator Fan With a Multimeter?<\/h2>\n\n\n\n<p>A multimeter is a versatile tool that can test various electrical devices for problems, but when you&rsquo;re checking a circuit that carries as much current as a fan, using a multimeter is a waste of time in most cases. But if you want to try this anyway, here are some tips that could help.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tips for Testing a Radiator with a Multimeter (Not Recommended)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Prepare the Engine Before the Test<\/h3>\n\n\n\n<p>Begin the test with the engine off and the key off. The fan runs all the time with the A\/C on, but if the A\/C isn&rsquo;t on, it only runs when the engine reaches temperature. Some platforms will have two fans side by side. Older Jeep Cherokees have an electric fan and a belt driven fan; there are various different configurations.<\/p>\n\n\n\n<p>Start the engine. Alternatively, switch the ignition key to the ignition 2 (IG2) position. IG2 is the ignition switch&rsquo;s driving position. The radiator fan should start running when the vehicle&rsquo;s ignition is in the IG2 position if the A\/C is on. Note that some systems will only engage the fan if the engine is running.<\/p>\n\n\n\n\n\n\n<h3 class=\"wp-block-heading\">Locate the Fuse Box That Contains the Relay and the Fan Fuse<\/h3>\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/fuse-box\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuse box\">fuse box<\/a> contains the <a href=\"https:\/\/www.carparts.com\/blog\/car-fuse-facts-what-you-need-to-know-about-automotive-fuses\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuses\">fuses<\/a> that protect the vehicle&rsquo;s electrical system. Its location varies between vehicle models. Some fuse boxes are located under the dashboard.<\/p>\n\n\n\n<p>Other fuse boxes can be found in the engine bay under the car&rsquo;s front hood, and some vehicles have fuse panels under the back seat or in the trunk.<\/p>\n\n\n\n<p><strong>Pro Tip:<\/strong> <em>Some will have as many as four fuse panels and may have a fuse panel on both the driver side and passenger side of the instrument panel. But the cooling fan relay is just about always under the hood in the power distribution center fuse panel. Some vehicles (like Crown Victorias) will have a &ldquo;high current relay center&rdquo; that only has a couple of relays, one being the fan relay.<\/em><\/p>\n\n\n\n<p>Depending on its location, the fuse box might have a different connection point for the multimeter. We&rsquo;ll cover the differences in greater detail later.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Check the Right Fuses<\/h3>\n\n\n\n<p>The multimeter method measures the voltage of the specific fuse that protects the radiator fan circuit, but note that this information is useless when you consider that voltage without current flow can&rsquo;t do any real work. If you use your multimeter in series with the fan, you&rsquo;ll blow the fuse in your meter, so don&rsquo;t try this.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"535\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/heavy-fuse-for-radiator-fans-and-cooling-fans-.jpg\" alt=\"heavy fuse for radiator fans and cooling fans\" class=\"wp-image-115288\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/heavy-fuse-for-radiator-fans-and-cooling-fans-.jpg 700w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/heavy-fuse-for-radiator-fans-and-cooling-fans--300x229.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2024\/06\/heavy-fuse-for-radiator-fans-and-cooling-fans--150x115.jpg 150w\" sizes=\"(max-width: 700px) 100vw, 700px\"><figcaption class=\"wp-element-caption\">Radiator fans and cooling fans pull quite a bit of current and will usually have a heavy fuse. Furthermore, fans tend to heat up any place in the circuit where there is resistance due to oxidation of terminals (see photo). | Image Source: Richard McCuistian<\/figcaption><\/figure>\n\n\n\n<p>You can save yourself time, labor costs, and potential repair costs by testing the radiator fan yourself. Get the right data that you need to make an informed decision.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/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>Is your engine&rsquo;s radiator fan not spinning when it&rsquo;s supposed to cool your vehicle&rsquo;s engine? Don&rsquo;t go shopping for a&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/tips-on-how-to-test-the-radiator-fan\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":109659,"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":[1167],"ppma_author":[2607,2985],"class_list":{"0":"post-109520","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-cooling-system","8":"category-diy","9":"tag-radiator-fan-2","10":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Tips on How to Test the Radiator Fan - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Are you wondering if the radiator fan stopped because it or another part has failed? 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He has produced a coffee table book of digital watercolors called \u201cMemories of South Alabama\u201d created from his personal photos, along with a dozen Christian fiction short original novels and a collection of short stories, all available in Kindle or softcover format. 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