{"id":32312,"date":"2016-08-03T12:17:39","date_gmt":"2016-08-03T17:17:39","guid":{"rendered":"http:\/\/www.freeautomechanic.com\/mechanic\/forum\/?p=32312"},"modified":"2016-08-03T12:17:57","modified_gmt":"2016-08-03T17:17:57","slug":"leaking-coolant-1999-buick-century","status":"publish","type":"post","link":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2016\/08\/leaking-coolant-1999-buick-century","title":{"rendered":"Leaking Coolant 1999 Buick Century"},"content":{"rendered":"<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-34121\" src=\"\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2016\/01\/2001-buick-century.jpg\" alt=\"2001 Buick Century\" width=\"600\" height=\"263\" srcset=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2016\/01\/2001-buick-century.jpg 600w, https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2016\/01\/2001-buick-century-300x132.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/>I have a problem with my <a href=\"\/\/www.freeautomechanic.com\/cooling-system.html\">cooling system in my 1999 Buick Century Custom<\/a>. I am leaking coolant. I tried stop leak, is not working. I can drive for long periods of time, open the radiator cap without any problem. It is cold to the touch and there is no pressure when I release the cap.<\/p>\n<hr \/>\n<p>RESPONSE<\/p>\n<p>Sounds like your thermostat may be stuck in the open position as well as leaking coolant. Also the radiator cap may be faulty if no pressure is building or you have a large leak. You will need to use a cooling system pressure tester.<\/p>\n<h3>How to find leaking coolant<\/h3>\n<ul>\n<li>With the engine off,\u00a0 Remove the radiator cap and attach the pressure tester<\/li>\n<li>Pump up the tester to apply pressure on the system. Pressure should be the same as the radiator cap. (around 17-20 psi)<\/li>\n<li>Look for the leak, put cardboard underneath to help if needed. If no external leak is found, remove spark plugs and look for coolant to come out spark plug holes.<\/li>\n<li>Repair the leak<\/li>\n<li>Pump up the tester again<\/li>\n<li>Watch for the pressure to hold, this indicate no more leak in the system.<\/li>\n<\/ul>\n<p><code><iframe style=\"width: 120px; height: 240px;\" src=\"\/\/ws-na.amazon-adsystem.com\/widgets\/q?ServiceVersion=20070822&amp;OneJS=1&amp;Operation=GetAdHtml&amp;MarketPlace=US&amp;source=ss&amp;ref=as_ss_li_til&amp;ad_type=product_link&amp;tracking_id=freea08-20&amp;marketplace=amazon&amp;region=US&amp;placement=B018K9K2U0&amp;asins=B018K9K2U0&amp;linkId=b11e84b561ea7896c0c5d060cb7b091f&amp;show_border=true&amp;link_opens_in_new_window=true\" width=\"300\" height=\"150\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/code><\/p>\n<h1><span class=\"search_highlight\">Coolant<\/span> Description<\/h1>\n<p><span class=\"admonition_caution\"><strong>Caution!<\/strong><b>\u00a0<\/b>Antifreeze can be added to raise the boiling point of the <span class=\"search_highlight\">coolant<\/span>, but too much will affect the freezing point. Do not use a solution stronger than 70\u00a0percent antifreeze, as the freeze level rises rapidly after this point. Pure antifreeze will freeze at -22\u00b0C (-8\u00b0F).<\/span><\/p>\n<p>GM Goodwrench DEX-COOL\u00ae was developed in order to last for 240,000\u00a0km (150,00\u00a0miles) or 5\u00a0years, whichever occurs first. Follow the instructions in Draining and Filling Cooling System . Use only GM Goodwrench DEX-COOL\u00ae or HAVOLINE\u00ae DEX-COOL\u00ae when adding or changing the <span class=\"search_highlight\">coolant<\/span>.<\/p>\n<p>A 50\/50 mixture of ethylene glycol DEX-COOL\u00ae and water will provide the following protection:<\/p>\n<ul type=\"BULLET\">\n<li>Give freezing protection down to -37\u00b0C (-34\u00b0F)<\/li>\n<li>Give boiling protection up to 129\u00b0C (265\u00b0F)<\/li>\n<li>Protect against rust and corrosion<\/li>\n<li>Help keep the proper engine temperature<\/li>\n<li>Let the warning lights and gauges work as they should.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>I have a problem with my cooling system in my 1999 Buick Century Custom. I am leaking coolant. I tried stop leak, is not working. I can drive for long periods of time, open the radiator cap without any problem. It is cold to the touch and there is no pressure when I release the&hellip;&nbsp;<a href=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2016\/08\/leaking-coolant-1999-buick-century\" rel=\"bookmark\">Read More &raquo;<span class=\"screen-reader-text\">Leaking Coolant 1999 Buick Century<\/span><\/a><\/p>\n","protected":false},"author":12948,"featured_media":0,"comment_status":"open","ping_status":"closed","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":[1,54],"tags":[9325,82,10799],"class_list":["post-32312","post","type-post","status-publish","format-standard","hentry","category-auto-repair-questions","category-buick","tag-century","tag-coolant-leak","tag-leaking-coolant"],"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>Leaking Coolant 1999 Buick Century - FreeAutoMechanic Advice<\/title>\n<meta name=\"description\" content=\"I am leaking coolant. 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