{"id":7236,"date":"2026-06-17T01:11:09","date_gmt":"2026-06-17T01:11:09","guid":{"rendered":"http:\/\/australianholden.com\/?p=7236"},"modified":"2026-06-21T12:06:12","modified_gmt":"2026-06-21T12:06:12","slug":"holden-red-motor-radiator-upgrade-guide","status":"publish","type":"post","link":"https:\/\/australianholden.com\/index.php\/2026\/06\/17\/holden-red-motor-radiator-upgrade-guide\/","title":{"rendered":"Holden Red Motor Radiator Upgrade Guide"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The Holden Red Motor is one of Australia&#8217;s most beloved engines. From the EH through to the WB series, these tough six-cylinder powerplants earned a reputation for reliability, simplicity and longevity. However, one area that often struggles in modern conditions is cooling performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When these engines were designed, Australian roads were different. Traffic was lighter, ambient temperatures were lower in city environments, and few owners expected to spend hours sitting in traffic with air conditioning running. Fast forward fifty years and many Red Motor-powered Holdens are now fitted with performance upgrades, automatic transmissions, electric accessories and air conditioning systems that place additional strain on the cooling system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your Holden runs hotter than you&#8217;d like, upgrading the radiator is one of the most effective improvements you can make. This guide covers why radiator upgrades are worthwhile, the best options available and the products that provide the greatest value for classic Holden owners.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Why Upgrade the Original Radiator?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Factory radiators were designed around the original engine output and driving conditions of the day.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Today, many Holden owners experience:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Overheating in traffic<\/li>\n\n\n\n<li>Coolant loss<\/li>\n\n\n\n<li>Poor cooling during summer<\/li>\n\n\n\n<li>High operating temperatures during highway driving<\/li>\n\n\n\n<li>Heat soak after engine shutdown<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Even a radiator that looks acceptable externally may have significant internal blockage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After decades of service, efficiency can be dramatically reduced.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Signs Your Radiator Needs Attention<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Before spending money on upgrades, look for common warning signs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms of a Failing Radiator<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Temperature gauge regularly above normal<\/li>\n\n\n\n<li>Coolant boiling after shutdown<\/li>\n\n\n\n<li>Rusty coolant<\/li>\n\n\n\n<li>Coolant leaks<\/li>\n\n\n\n<li>Green staining around tanks<\/li>\n\n\n\n<li>Hot engine despite new thermostat<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If several of these symptoms are present, a radiator upgrade is often a better investment than repeated repairs.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Common Red Motor Cooling Challenges<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The radiator is only one part of the cooling system, but it often becomes the bottleneck.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Factors That Increase Cooling Demand<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Air conditioning installation<\/li>\n\n\n\n<li>Automatic transmission conversions<\/li>\n\n\n\n<li>Performance camshafts<\/li>\n\n\n\n<li>Increased compression ratios<\/li>\n\n\n\n<li>Towing<\/li>\n\n\n\n<li>Australian summer temperatures<\/li>\n\n\n\n<li>Stop-start traffic<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These conditions place significantly greater demands on the cooling system than Holden originally intended.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Copper Brass vs Aluminium Radiators<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">One of the biggest decisions owners face is whether to retain a traditional copper-brass radiator or upgrade to aluminium.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Copper Brass Radiators<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Advantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Original appearance<\/li>\n\n\n\n<li>Easy to repair<\/li>\n\n\n\n<li>Factory-correct restoration choice<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Disadvantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Heavier<\/li>\n\n\n\n<li>Less efficient than modern designs<\/li>\n\n\n\n<li>More susceptible to corrosion<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Copper-brass units remain the preferred choice for concours restorations.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Aluminium Radiators<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Advantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Improved cooling efficiency<\/li>\n\n\n\n<li>Lighter weight<\/li>\n\n\n\n<li>Better heat dissipation<\/li>\n\n\n\n<li>Corrosion resistant<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Disadvantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Less factory-correct appearance<\/li>\n\n\n\n<li>Higher initial cost<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For most regularly driven Holdens, aluminium radiators offer the best overall cooling performance.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Aluminium Radiator Upgrade<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Alloy Performance Radiator<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A quality aluminium radiator is one of the most effective cooling upgrades available for Red Motor Holdens.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Increased cooling capacity<\/li>\n\n\n\n<li>Improved airflow<\/li>\n\n\n\n<li>Better temperature control<\/li>\n\n\n\n<li>Ideal for modified engines<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>EH Holden<\/li>\n\n\n\n<li>HR Holden<\/li>\n\n\n\n<li>HK-HG Holden<\/li>\n\n\n\n<li>HQ-WB Holden<\/li>\n\n\n\n<li>Modified Red Motors<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Many owners report temperature reductions of 10-20 degrees under demanding conditions.<\/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;Radiator<\/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 : \"Radiator\",\nfu_ebay_query : \"Holden red 6 radiator\",\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<h1 class=\"wp-block-heading\">Should You Upgrade to a Three-Core Radiator?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">For owners wanting a factory-style appearance, a three-core radiator can be an excellent compromise.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Retains original look<\/li>\n\n\n\n<li>Greater coolant capacity<\/li>\n\n\n\n<li>Improved cooling efficiency<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Restorations<\/li>\n\n\n\n<li>Mild performance builds<\/li>\n\n\n\n<li>Touring vehicles<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A professionally recored radiator often performs significantly better than the original design.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Radiator Cap Upgrade<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The radiator cap plays a bigger role than many people realise.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Common Problems<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Coolant loss<\/li>\n\n\n\n<li>Boiling<\/li>\n\n\n\n<li>Pressure leaks<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Tridon Radiator Cap<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Maintains proper system pressure<\/li>\n\n\n\n<li>Improves coolant boiling point<\/li>\n\n\n\n<li>Reliable sealing<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Routine maintenance<\/li>\n\n\n\n<li>Cooling system rebuilds<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A quality cap is cheap insurance against overheating.<\/p>\n\n\n<div id=\"fu_ebay_1\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 1 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_1\"><\/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;Holden<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_1 = null;\nvar waitForDepends_fu_ebay_1 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_1);\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_1 = jQuery(\"#fu_ebay_1\");\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 : \"Holden\",\nfu_ebay_query : \"Tridon Radiator Cap Holden\",\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 : 1,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_1.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<h1 class=\"wp-block-heading\">Electric Fan Upgrades<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">One of the most popular cooling upgrades is the addition of electric fans.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Improved cooling in traffic<\/li>\n\n\n\n<li>Reduced engine load<\/li>\n\n\n\n<li>More consistent temperatures<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best Applications<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Air-conditioned vehicles<\/li>\n\n\n\n<li>Automatic transmission cars<\/li>\n\n\n\n<li>Modified engines<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Electric fans are particularly effective when paired with an upgraded radiator.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Electric Fan Kit<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Davies Craig Thermatic Fan Kit<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Australian-designed<\/li>\n\n\n\n<li>Adjustable temperature control<\/li>\n\n\n\n<li>Proven reliability<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Daily drivers<\/li>\n\n\n\n<li>Performance builds<\/li>\n\n\n\n<li>Summer cruising<\/li>\n<\/ul>\n\n\n<div id=\"fu_ebay_2\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 2 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_2\"><\/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;Davies Craig Thermatic Fan Kit<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_2 = null;\nvar waitForDepends_fu_ebay_2 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_2);\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_2 = jQuery(\"#fu_ebay_2\");\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 : \"Davies Craig Thermatic Fan Kit\",\nfu_ebay_query : \"Davies Craig Thermatic Fan Kit\",\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 : 2,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_2.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<h1 class=\"wp-block-heading\">Don&#8217;t Forget the Hoses<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A new radiator connected to old hoses can create new problems.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Common Issues<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Swollen hoses<\/li>\n\n\n\n<li>Internal collapse<\/li>\n\n\n\n<li>Coolant leaks<\/li>\n\n\n\n<li>Age-related cracking<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Best Hose Upgrade<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Gates Radiator Hose Kit<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Excellent durability<\/li>\n\n\n\n<li>OE-quality construction<\/li>\n\n\n\n<li>Reliable fitment<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Full cooling system upgrades<\/li>\n\n\n\n<li>Preventative maintenance<\/li>\n<\/ul>\n\n\n<div id=\"fu_ebay_3\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 3 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_3\"><\/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;Gates<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_3 = null;\nvar waitForDepends_fu_ebay_3 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_3);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. 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While the original cooling system was more than adequate in its day, modern traffic, hotter climates and performance modifications place greater demands on these classic engines than ever before.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A quality aluminium radiator, fresh coolant, upgraded hoses and a properly functioning fan system can dramatically improve reliability, especially during Australian summers. Combined with products such as Penrite coolant, Gates hoses, Davies Craig fans and Tridon radiator caps, a well-planned radiator upgrade can help ensure your Red Motor remains cool, dependable and enjoyable for years to come.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Related Articles<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/17\/holden-red-motor-cooling-system-problems\/\" type=\"post\" id=\"7234\">Holden Red Motor Cooling System Problems<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/17\/holden-red-motor-149-179-issues-explained\/\" type=\"post\" id=\"7232\">Holden Red Motor 149 &amp; 179 Issues Explained<\/a><\/li>\n\n\n\n<li>Best Coolants for Classic Holdens<\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/16\/early-holden-cooling-system-problems-common-causes-symptoms-and-solutions\/\" type=\"post\" id=\"7199\">Early Holden Cooling System Problems<\/a><\/li>\n\n\n\n<li>Best Oils for Early Holden Engines<\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/16\/grey-motor-oil-leak-problems-explained\/\" type=\"post\" id=\"7222\">Holden Grey Motor Issues Explained<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/16\/how-to-inspect-an-early-holden-before-buying\/\" type=\"post\" id=\"7193\">How to Inspect an Early Holden Before Buying<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Holden Red Motor is one of Australia&#8217;s most beloved engines. From the EH through to the WB series, these tough six-cylinder powerplants earned a reputation for reliability, simplicity and longevity. However, one area that often struggles in modern conditions is cooling performance. When these engines were designed, Australian roads were different. Traffic was lighter, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3567,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1],"tags":[],"class_list":["post-7236","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Holden Red Motor Radiator Upgrade Guide - Australian Holden<\/title>\n<meta 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