{"id":52887,"date":"2017-07-31T09:35:18","date_gmt":"2017-07-31T14:35:18","guid":{"rendered":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/?p=52887"},"modified":"2024-02-11T11:22:56","modified_gmt":"2024-02-11T19:22:56","slug":"motor-runs-hot-and-looses-coolant","status":"publish","type":"post","link":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2017\/07\/motor-runs-hot-and-looses-coolant","title":{"rendered":"Motor runs hot and looses coolant 1991 Isuzu Trooper"},"content":{"rendered":"<p><img decoding=\"async\" class=\"alignnone size-full wp-image-52899\" src=\"\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2017\/07\/1991-isuzu-trooper.jpg\" alt=\"1991 Isuzu Trooper\" width=\"600\" height=\"312\" srcset=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2017\/07\/1991-isuzu-trooper.jpg 600w, https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2017\/07\/1991-isuzu-trooper-300x156.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p>\n<h2>Motor runs hot<\/h2>\n<p>My motor runs hot and looses coolant at about 2 quarts a week. I see no puddle of coolant underneath or any where. I&#8217;ve had the radiator, pressure cap and thermostat replaced. It starts fine cold but when hot, it doesn&#8217;t start up quickly but it does start, almost every time.<\/p>\n<hr \/>\n<p>Most likely scenario is the engine has a blown head gasket.<\/p>\n<ul>\n<li><strong><a href=\"\/\/www.freeautomechanic.com\/blown-head-gasket.html\">Blown Head Gasket Symptoms<\/a><\/strong><\/li>\n<li><a href=\"https:\/\/www.freeautomechanic.com\/overheating.html\"><strong>Engine Overheating<\/strong><\/a><\/li>\n<\/ul>\n<p>You can rule out an external leak by using a pressure tester tool and pressure testing the cooling system. This will allow you to see if the leak is external or internal. Since you are pressure testing you can remove the spark plugs to see if coolant comes out the holes.<\/p>\n<p><code><a href=\"https:\/\/www.amazon.com\/Goplus-Radiator-Pressure-Tester-Cooling\/dp\/B01MY4HY21\/ref=as_li_ss_il?ie=UTF8&amp;qid=1501511489&amp;sr=8-6&amp;keywords=coolant+pressure+tester&amp;linkCode=li3&amp;tag=freea08-20&amp;linkId=8e96cfa648b59e463703776971e12e68\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" src=\"\/\/ws-na.amazon-adsystem.com\/widgets\/q?_encoding=UTF8&amp;ASIN=B01MY4HY21&amp;Format=_SL250_&amp;ID=AsinImage&amp;MarketPlace=US&amp;ServiceVersion=20070822&amp;WS=1&amp;tag=freea08-20\" border=\"0\" \/><\/a><img decoding=\"async\" style=\"border: none !important; margin: 0px !important;\" src=\"https:\/\/ir-na.amazon-adsystem.com\/e\/ir?t=freea08-20&amp;l=li3&amp;o=1&amp;a=B01MY4HY21\" alt=\"\" width=\"1\" height=\"1\" border=\"0\" \/><\/code><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-52743\" src=\"\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2017\/06\/shop-item.jpg\" alt=\"Shop Automotive\" width=\"140\" height=\"30\" \/><code><\/code><\/p>\n<h3>How to pressure test the cooling system<\/h3>\n<ol>\n<li>Top off cooling system radiator and overflow when engine is COLD<\/li>\n<li>Attach pressure tester and build pressure to radiator cap limit (usually between 15-17 lbs will do)<\/li>\n<li>Let stand under pressure and observe any external leaks<\/li>\n<li>If no external leaks are found but pressure is still dropping, Re-leave pressure from tester and remove spark plugs.<\/li>\n<li>Build pressure back up and observe spark plugs holes for coolant coming out.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Motor runs hot My motor runs hot and looses coolant at about 2 quarts a week. I see no puddle of coolant underneath or any where. I&#8217;ve had the radiator, pressure cap and thermostat replaced. It starts fine cold but when hot, it doesn&#8217;t start up quickly but it does start, almost every time. Most&hellip;&nbsp;<a href=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2017\/07\/motor-runs-hot-and-looses-coolant\" rel=\"bookmark\">Read More &raquo;<span class=\"screen-reader-text\">Motor runs hot and looses coolant 1991 Isuzu Trooper<\/span><\/a><\/p>\n","protected":false},"author":14646,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[1,17],"tags":[19462,19463,19461,7562],"class_list":["post-52887","post","type-post","status-publish","format-standard","hentry","category-auto-repair-questions","category-isuzu","tag-looses-coolant","tag-motor-runs-hot","tag-runs-hot","tag-trooper"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.0 (Yoast SEO v27.1.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Motor runs hot and looses coolant 1991 Isuzu Trooper - FreeAutoMechanic Advice<\/title>\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.freeautomechanic.com\/mechanic\/forum\/2017\/07\/motor-runs-hot-and-looses-coolant\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Motor runs hot and looses coolant 1991 Isuzu Trooper\" \/>\n<meta property=\"og:description\" content=\"Motor runs hot My motor runs hot and looses coolant at about 2 quarts a week. I see no puddle of coolant underneath or any where. I&#8217;ve had the radiator, pressure cap and thermostat replaced. It starts fine cold but when hot, it doesn&#8217;t start up quickly but it does start, almost every time. 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I see no puddle of coolant underneath or any where. I&#8217;ve had the radiator, pressure cap and thermostat replaced. It starts fine cold but when hot, it doesn&#8217;t start up quickly but it does start, almost every time. 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