{"id":6562,"date":"2026-05-30T06:41:43","date_gmt":"2026-05-30T06:41:43","guid":{"rendered":"http:\/\/australianholden.com\/?page_id=6562"},"modified":"2026-05-30T06:41:47","modified_gmt":"2026-05-30T06:41:47","slug":"hx-holden-cooling-system","status":"publish","type":"page","link":"https:\/\/australianholden.com\/index.php\/home\/h-series\/hx-holden\/hx-holden-cooling-system\/","title":{"rendered":"HX Holden Cooling System"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/australianholden.com\/index.php\/australian-holden\/h-series\/hx-holden\/\" type=\"page\" id=\"39\">HX Holden<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Previous: HJ Holden Cooling System<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Next: HZ Holden Cooling System<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The HX Holden sits right in the sweet spot of classic Australian motoring. Released in 1976 as the successor to the HJ, the HX refined Holden\u2019s already successful large-car formula with better emissions control, improved drivability, and subtle mechanical updates aimed at reliability and efficiency.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While the styling changes were relatively minor, Holden engineers spent plenty of time improving the underlying systems that mattered to Australian drivers \u2014 and few systems mattered more than cooling. These cars were expected to survive brutal summers, endless highway kilometres, heavy towing duties, and country-town traffic jams without overheating.<\/p>\n\n\n<div id=\"fu_ebay_0\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 0 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_0\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;HX Holden<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_0 = null;\nvar waitForDepends_fu_ebay_0 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_0);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_0 = jQuery(\"#fu_ebay_0\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"HX Holden\",\nfu_ebay_query : \"HX Holden Cooling\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 0,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_0.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<p class=\"wp-block-paragraph\">50 years later, the HX remains a favourite among restorers, street machine builders, and weekend cruisers. But age has made cooling system maintenance one of the most important aspects of owning one today.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cooling System Overview<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The HX Holden used a conventional liquid cooling system featuring:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; Copper-brass crossflow radiator<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; Belt-driven mechanical water pump<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; Thermostat-controlled coolant flow<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; Engine-driven clutch fan<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; Overflow reservoir bottle<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; Transmission cooler integrated into automatic radiators<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The setup was simple, rugged, and specifically designed for Australian conditions where reliability mattered more than outright sophistication.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Compared to earlier HQ and HJ models, the HX benefited from improved emissions tuning and slightly revised cooling characteristics.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Radiator Design<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The HX used a traditional copper-brass crossflow radiator setup.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Features:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; large frontal cooling area<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; strong low-speed cooling ability<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; durable metal construction<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; easy repair and re-coring<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Radiator sizing varied depending on:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; six-cylinder or V8 engine<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; air conditioning fitment<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; automatic or manual transmission<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Automatic cars featured integrated transmission coolers built into the radiator tanks.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Common Radiator Problems<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Most original HX radiators are now decades old and suffer from age-related deterioration.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Common issues include:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; internal corrosion<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; blocked cooling tubes<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; leaking solder joints<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; damaged cooling fins<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; cracked hose necks<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Poor coolant maintenance over the years is one of the biggest causes of overheating in surviving cars.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Fan Systems<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The HX primarily relied on engine-driven clutch fans.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Advantages:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; excellent airflow at idle<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; reliable towing performance<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; simple operation<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; long-term durability<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This setup worked particularly well in Australian heat where slow-speed airflow is critical.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Modern builds often upgrade to electric thermo fans for:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; improved airflow control<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; reduced engine drag<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; quieter operation<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; better fuel efficiency<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Water Pump<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The HX used a conventional belt-driven centrifugal water pump mounted at the front of the engine.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Functions:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; circulate coolant through engine and radiator<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; stabilise operating temperatures<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; support heater core flow<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; prevent hot spots inside cylinder heads<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The factory water pumps were generally very durable if coolant maintenance was kept up.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Common Water Pump Problems<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Typical symptoms include:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; coolant leaks from weep hole<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; noisy pump bearings<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; pulley wobble<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; overheating during idle<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; visible coolant residue<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V8-powered cars place noticeably greater strain on water pumps and cooling components.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Thermostat System<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The HX used a conventional wax-pellet thermostat arrangement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Functions:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; regulate coolant flow<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; improve engine warm-up<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; maintain stable temperatures<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; improve fuel economy and drivability<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The system was mechanically simple and inexpensive to service.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Common Thermostat Problems<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thermostat failures are common in ageing HX Holdens.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Symptoms:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; fluctuating temperature readings<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; overheating in traffic<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; poor heater performance<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; slow warm-up times<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fortunately, replacement remains straightforward and inexpensive.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Coolant Specifications<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Holden originally recommended anti-corrosion coolant designed for cast iron engines and copper-brass radiators.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Recommended coolant features:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; corrosion inhibitors<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; anti-cavitation protection<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; stable boiling point performance<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; protection against internal scale buildup<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Using proper coolant is critical for preserving older cooling systems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Why Coolant Maintenance Matters<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Neglected coolant destroys old Holden cooling systems from the inside out.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Common issues caused by poor maintenance:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; radiator blockage<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; heater core restriction<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; internal corrosion<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; water pump wear<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; sludge buildup in coolant passages<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Regular coolant flushing dramatically improves long-term reliability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Common HX Cooling System Problems<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Radiator Corrosion<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One of the biggest issues on surviving HX Holdens.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Symptoms:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; overheating on long drives<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; coolant leaks<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; rust-coloured coolant<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; reduced cooling efficiency<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Fan Clutch Wear<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Symptoms:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; overheating in traffic<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; poor idle cooling<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; excessive fan noise<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Heater Core Restriction<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Often caused by decades of poor coolant maintenance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Symptoms:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; weak cabin heater performance<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; fluctuating temperatures<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; coolant contamination<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Thermostat Failure<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Symptoms:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; unstable temperature readings<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; inconsistent warm-up behaviour<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; overheating during slow driving<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cooling System Service Components<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Water Pump<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Typical lifespan:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; 120,000\u2013180,000 km<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Radiator<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Typical rebuild or replacement age:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; 10\u201315 years<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Thermostat<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Usually replaced around:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; 100,000\u2013150,000 km<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Coolant<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Recommended interval:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; every 2\u20135 years depending on coolant type<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Best Cooling Upgrades for HX Holden<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The HX platform responds extremely well to modern cooling upgrades.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Popular upgrades include:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; aluminium radiators<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; thermo fan conversions<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; silicone radiator hoses<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; upgraded water pumps<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; alloy overflow tanks<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; high-flow radiator cores<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; low-temperature thermostats<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">These upgrades are especially useful for modified V8-powered cars.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cooling Upgrades for Street Machines &amp; Towing<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Many HX Holdens now run significantly more power than factory specification.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Recommended upgrades:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; thicker radiator cores<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; twin thermo fans<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; engine oil coolers<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; transmission coolers<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; improved fan shrouds<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The HX Holden cooling system perfectly reflects Holden engineering during the golden era of Australian full-size cars. It was designed to be durable, simple to service, and capable of surviving harsh local conditions without complaint.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/australianholden.com\/index.php\/australian-holden\/h-series\/hx-holden\/\" type=\"page\" id=\"39\">HX Holden<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Previous: HJ Holden Cooling System<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Next: HZ Holden Cooling System<\/p>\n","protected":false},"excerpt":{"rendered":"<p>HX Holden Previous: HJ Holden Cooling System Next: HZ Holden Cooling System The HX Holden sits right in the sweet spot of classic Australian motoring. Released in 1976 as the successor to the HJ, the HX refined Holden\u2019s already successful large-car formula with better emissions control, improved drivability, and subtle mechanical updates aimed at reliability [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":583,"parent":39,"menu_order":16,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"class_list":["post-6562","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>HX Holden Cooling System - Australian Holden<\/title>\n<meta name=\"description\" content=\"Released in 1976 as the successor to the HJ, the HX refined Holden\u2019s already successful large-car formula with better emissions control,\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/australianholden.com\/index.php\/home\/h-series\/hx-holden\/hx-holden-cooling-system\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"HX Holden Cooling System - 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