{"id":7234,"date":"2026-06-17T00:46:23","date_gmt":"2026-06-17T00:46:23","guid":{"rendered":"http:\/\/australianholden.com\/?p=7234"},"modified":"2026-06-21T12:08:38","modified_gmt":"2026-06-21T12:08:38","slug":"holden-red-motor-cooling-system-problems","status":"publish","type":"post","link":"https:\/\/australianholden.com\/index.php\/2026\/06\/17\/holden-red-motor-cooling-system-problems\/","title":{"rendered":"Holden Red Motor Cooling System Problems"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The Holden Red Motor is renowned for being one of Australia&#8217;s toughest and most reliable engines. Whether fitted to an EH, HD, HR, HK, HT, HG, HQ, HJ, HX, HZ or WB Holden, the famous inline six-cylinder engine earned its reputation by surviving decades of daily driving, towing, racing and abuse.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, like any engine designed more than half a century ago, the cooling system has become one of the most common sources of problems. Many Holden owners blame the Red Motor itself for overheating, but in reality, the majority of cooling issues stem from ageing components, neglected maintenance or modifications that upset the original cooling balance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your Red Motor is running hotter than it should, losing coolant, or constantly creeping towards the red on the temperature gauge, this guide explains the most common causes, symptoms and solutions.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Why Cooling System Problems Are Common Today<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">When Holden designed the Red Motor, the cooling system was more than adequate for Australian conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The problem is that most cooling systems are now decades old.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Common contributing factors include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Internal radiator corrosion<\/li>\n\n\n\n<li>Blocked engine water jackets<\/li>\n\n\n\n<li>Worn water pumps<\/li>\n\n\n\n<li>Incorrect thermostats<\/li>\n\n\n\n<li>Old hoses<\/li>\n\n\n\n<li>Poor quality coolant<\/li>\n\n\n\n<li>Engine modifications<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Many Red Motors are still running original-style cooling systems that have never been completely rebuilt.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Engine Overheating<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Overheating is by far the most common cooling complaint among Red Motor owners.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Temperature gauge climbing above normal<\/li>\n\n\n\n<li>Coolant boiling into overflow bottle<\/li>\n\n\n\n<li>Steam from radiator<\/li>\n\n\n\n<li>Loss of coolant<\/li>\n\n\n\n<li>Engine pinging under load<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Blocked radiator<\/li>\n\n\n\n<li>Stuck thermostat<\/li>\n\n\n\n<li>Worn water pump<\/li>\n\n\n\n<li>Ignition timing issues<\/li>\n\n\n\n<li>Lean fuel mixture<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Fortunately, most overheating problems can be diagnosed systematically.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Blocked Radiators<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Radiator blockage is one of the leading causes of Red Motor overheating.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why It Happens<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Over time, rust and mineral deposits accumulate inside the radiator core.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This reduces coolant flow and heat transfer.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Engine runs hot at highway speeds<\/li>\n\n\n\n<li>Coolant appears rusty<\/li>\n\n\n\n<li>Uneven radiator temperatures<\/li>\n\n\n\n<li>Persistent overheating<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A radiator may appear fine externally while being severely restricted internally.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Radiator Upgrade<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Aluminium Performance Radiator<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Improved cooling efficiency<\/li>\n\n\n\n<li>Increased coolant capacity<\/li>\n\n\n\n<li>Better heat transfer<\/li>\n\n\n\n<li>Corrosion resistance<\/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>Modified engines<\/li>\n\n\n\n<li>Summer driving<\/li>\n\n\n\n<li>Towing applications<\/li>\n\n\n\n<li>Highway cruising<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Many owners find that upgrading the radiator completely transforms cooling performance.<\/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    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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\">Blocked Engine Water Jackets<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">One issue unique to older Red Motors is internal block corrosion.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Persistent overheating<\/li>\n\n\n\n<li>Poor coolant circulation<\/li>\n\n\n\n<li>Localised hot spots<\/li>\n\n\n\n<li>Rusty coolant<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Why It Happens<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Decades of running plain water or poor-quality coolant allows rust to build inside the engine block.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In severe cases, coolant passages become heavily restricted.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A cooling system flush often reveals significant rust deposits.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Cooling System Flush<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Nulon Radiator Flush<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Removes rust deposits<\/li>\n\n\n\n<li>Improves coolant flow<\/li>\n\n\n\n<li>Helps restore cooling efficiency<\/li>\n\n\n\n<li>Easy DIY application<\/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>Preventative maintenance<\/li>\n\n\n\n<li>Older engines<\/li>\n\n\n\n<li>Cooling system restoration<\/li>\n<\/ul>\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;Nulon<\/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 : \"Nulon\",\nfu_ebay_query : \"Nulon Radiator flush\",\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\">Water Pump Failure<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The water pump is responsible for circulating coolant through the engine and radiator.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Coolant leaks from pump<\/li>\n\n\n\n<li>Bearing noise<\/li>\n\n\n\n<li>Overheating at low speed<\/li>\n\n\n\n<li>Coolant circulation issues<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Worn bearings<\/li>\n\n\n\n<li>Seal failure<\/li>\n\n\n\n<li>Corrosion<\/li>\n\n\n\n<li>Age-related deterioration<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Many original pumps have already exceeded their intended lifespan several times over.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Water Pump Replacement<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: GMB Water Pump<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>OE-quality construction<\/li>\n\n\n\n<li>Reliable bearings<\/li>\n\n\n\n<li>Long service life<\/li>\n\n\n\n<li>Direct 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>Stock restorations<\/li>\n\n\n\n<li>Daily drivers<\/li>\n\n\n\n<li>Preventative maintenance<\/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;GMB<\/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. 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Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_3 = jQuery(\"#fu_ebay_3\");\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 : \"Tridon\",\nfu_ebay_query : \"Tridon Holden Thermostat\",\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 : 3,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_3.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\">Cooling Hose Deterioration<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Many cooling problems originate from old hoses.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Coolant leaks<\/li>\n\n\n\n<li>Swollen hoses<\/li>\n\n\n\n<li>Cracks in rubber<\/li>\n\n\n\n<li>Collapsed lower radiator hose<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Why It Happens<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Heat and age eventually break down rubber compounds.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Even hoses that appear acceptable externally may be deteriorating internally.<\/p>\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>High-quality rubber<\/li>\n\n\n\n<li>Excellent durability<\/li>\n\n\n\n<li>OE-style 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 rebuilds<\/li>\n\n\n\n<li>Preventative maintenance<\/li>\n<\/ul>\n\n\n<div id=\"fu_ebay_4\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 4 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_4\"><\/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_4 = null;\nvar waitForDepends_fu_ebay_4 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_4);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. 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Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_6 = jQuery(\"#fu_ebay_6\");\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 : \"Digital Water Temperature Gauge\",\nfu_ebay_query : \"Digital Water Temperature Gauge\",\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 : 6,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_6.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\">Common Cooling System Mistakes<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Running Plain Water<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Encourages corrosion and internal rust.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ignoring Coolant Changes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Coolant additives eventually break down.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Replacing Parts Without Diagnosis<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Many owners replace multiple components when a simple blockage is the real issue.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Using Incorrect Thermostats<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Not all thermostats are created equal.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Holden Red Motor is rarely the cause of its own cooling problems. Most overheating issues stem from ageing radiators, blocked water passages, worn pumps, deteriorated hoses or neglected maintenance. The good news is that these problems are generally easy to diagnose and relatively inexpensive to fix.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">By combining a clean cooling system, quality coolant, a properly functioning thermostat and a healthy radiator, a Red Motor can run reliably even in harsh Australian summer conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Products such as Penrite coolant, Nulon flushes, Gates hoses, Tridon thermostats and upgraded aluminium radiators remain some of the best investments a Holden owner can make when restoring or maintaining one of Australia&#8217;s most iconic engines.<\/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-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\">Grey Motor Oil Leak Problems 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 renowned for being one of Australia&#8217;s toughest and most reliable engines. Whether fitted to an EH, HD, HR, HK, HT, HG, HQ, HJ, HX, HZ or WB Holden, the famous inline six-cylinder engine earned its reputation by surviving decades of daily driving, towing, racing and abuse. However, like any engine [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3484,"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-7234","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 Cooling System Problems - Australian Holden<\/title>\n<meta name=\"description\" content=\"The Holden Red Motor is renowned for being one of Australia&#039;s toughest and most reliable engines.\" \/>\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\/2026\/06\/17\/holden-red-motor-cooling-system-problems\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Holden Red Motor Cooling System Problems - Australian Holden\" \/>\n<meta property=\"og:description\" content=\"The Holden Red Motor is renowned for being one of Australia&#039;s toughest and most reliable engines.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/australianholden.com\/index.php\/2026\/06\/17\/holden-red-motor-cooling-system-problems\/\" \/>\n<meta property=\"og:site_name\" content=\"Australian Holden\" \/>\n<meta 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