{"id":7352,"date":"2026-06-16T06:06:40","date_gmt":"2026-06-16T06:06:40","guid":{"rendered":"http:\/\/australianholden.com\/?p=7352"},"modified":"2026-06-21T11:33:07","modified_gmt":"2026-06-21T11:33:07","slug":"vb-vc-vh-and-vk-commodore-cooling-system-problems","status":"publish","type":"post","link":"https:\/\/australianholden.com\/index.php\/2026\/06\/16\/vb-vc-vh-and-vk-commodore-cooling-system-problems\/","title":{"rendered":"VB, VC, VH and VK Commodore Cooling System Problems"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The VB, VC, VH and VK Commodore are among Australia&#8217;s most popular classic Holden models. Whether powered by a 2.85-litre six, 3.3-litre red\/ blue motor, 4.2-litre V8 or 5.0-litre V8, these early Commodores were designed to provide reliable performance in Australian conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, after more than 40 years on the road, cooling system problems have become increasingly common. Overheating, coolant leaks, blocked radiators and failing water pumps can quickly turn a pleasant weekend cruise into a roadside breakdown.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The good news is that most cooling system issues are well understood and relatively easy to diagnose. With proper maintenance and a few sensible upgrades, early Commodores can remain dependable even during Australia&#8217;s hottest summers.<\/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 : \"Commodore 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\">Understanding the Commodore Cooling System<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The cooling system is designed to regulate engine temperature by circulating coolant through the engine and radiator.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Key components include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Radiator<\/li>\n\n\n\n<li>Water pump<\/li>\n\n\n\n<li>Thermostat<\/li>\n\n\n\n<li>Cooling fan<\/li>\n\n\n\n<li>Heater core<\/li>\n\n\n\n<li>Hoses<\/li>\n\n\n\n<li>Coolant<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Failure of any component can result in overheating.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Overheating Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Overheating is by far the most common cooling complaint among early Commodore 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 running high<\/li>\n\n\n\n<li>Coolant overflow<\/li>\n\n\n\n<li>Steam from engine bay<\/li>\n\n\n\n<li>Engine pinging or detonation<\/li>\n\n\n\n<li>Reduced performance<\/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>Faulty thermostat<\/li>\n\n\n\n<li>Water pump failure<\/li>\n\n\n\n<li>Airflow restrictions<\/li>\n\n\n\n<li>Coolant leaks<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ignoring overheating can lead to serious engine damage.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Blocked Radiators<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Many original Commodore radiators are now decades old.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Common Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Engine runs hot in traffic<\/li>\n\n\n\n<li>Coolant discolouration<\/li>\n\n\n\n<li>Uneven radiator temperatures<\/li>\n\n\n\n<li>Poor cooling performance<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Internal corrosion<\/li>\n\n\n\n<li>Sediment build-up<\/li>\n\n\n\n<li>Old coolant<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Even vehicles with low kilometres can suffer internal blockage.<\/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>Better heat dissipation<\/li>\n\n\n\n<li>Increased reliability<\/li>\n\n\n\n<li>Reduced weight<\/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>Blue motor sixes<\/li>\n\n\n\n<li>Holden V8s<\/li>\n\n\n\n<li>Modified engines<\/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;Radaitor<\/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 : \"Radaitor\",\nfu_ebay_query : \"aluminium radiator VB VC VH VK Commodore\",\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 circulates coolant throughout the engine.<\/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>Bearing noise<\/li>\n\n\n\n<li>Overheating<\/li>\n\n\n\n<li>Poor heater performance<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Seal wear<\/li>\n\n\n\n<li>Bearing deterioration<\/li>\n\n\n\n<li>Corrosion<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Most original water pumps have exceeded their expected lifespan.<\/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>OEM-quality construction<\/li>\n\n\n\n<li>Reliable operation<\/li>\n\n\n\n<li>Excellent value<\/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>Holden six-cylinder engines<\/li>\n\n\n\n<li>Holden 253 V8<\/li>\n\n\n\n<li>Holden 308 V8<\/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;Water Pump<\/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 : \"Water Pump\",\nfu_ebay_query : \"GMB Commodore water pump\",\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\">Thermostat Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A faulty thermostat can cause either overheating or slow warm-up.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Engine overheating<\/li>\n\n\n\n<li>Temperature fluctuations<\/li>\n\n\n\n<li>Poor heater performance<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Failures<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Stuck closed<\/li>\n\n\n\n<li>Stuck open<\/li>\n\n\n\n<li>Inconsistent operation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Fortunately, thermostats are inexpensive and easy to replace.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Thermostat Upgrade<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Tridon Thermostat<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Accurate temperature control<\/li>\n\n\n\n<li>Reliable operation<\/li>\n\n\n\n<li>Australian availability<\/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>Standard restorations<\/li>\n\n\n\n<li>Daily drivers<\/li>\n\n\n\n<li>Touring vehicles<\/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;Tridon<\/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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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 Fan Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Early Commodores used engine-driven fans and fan clutches.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Overheating at low speed<\/li>\n\n\n\n<li>Excessive fan noise<\/li>\n\n\n\n<li>Reduced cooling in traffic<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Worn fan clutch<\/li>\n\n\n\n<li>Damaged fan blades<\/li>\n\n\n\n<li>Airflow restrictions<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Many overheating complaints only occur during stop-start driving.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Fan Clutch Failure<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The viscous fan clutch is a common failure point.<\/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 in traffic<\/li>\n\n\n\n<li>Little fan resistance when spinning by hand<\/li>\n\n\n\n<li>Reduced airflow<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Replacing a worn fan clutch often restores cooling performance immediately.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Coolant Leaks<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Even small coolant leaks can create major problems.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Common Leak Locations<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Radiator tanks<\/li>\n\n\n\n<li>Heater hoses<\/li>\n\n\n\n<li>Water pump<\/li>\n\n\n\n<li>Thermostat housing<\/li>\n\n\n\n<li>Heater core<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Warning Signs<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sweet coolant smell<\/li>\n\n\n\n<li>Low coolant level<\/li>\n\n\n\n<li>Wet engine bay<\/li>\n\n\n\n<li>Stains beneath vehicle<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Leaks should always be addressed immediately.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Heater Core Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The heater core is effectively a small radiator inside the cabin.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Coolant smell inside vehicle<\/li>\n\n\n\n<li>Fogged windows<\/li>\n\n\n\n<li>Wet carpet<\/li>\n\n\n\n<li>Coolant loss<\/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>Internal corrosion<\/li>\n\n\n\n<li>Age-related deterioration<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Replacement can be labour intensive but is often necessary.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Hose Deterioration<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Original rubber hoses eventually fail.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Soft hoses<\/li>\n\n\n\n<li>Cracks<\/li>\n\n\n\n<li>Swelling<\/li>\n\n\n\n<li>Coolant leaks<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A burst hose can cause rapid overheating.<\/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>Quality construction<\/li>\n\n\n\n<li>Improved reliability<\/li>\n\n\n\n<li>Long service life<\/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>Full cooling system rebuilds<\/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. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_4 = jQuery(\"#fu_ebay_4\");\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 : \"Gates\",\nfu_ebay_query : \"Gates radiator hose kit Commodore\",\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 : 4,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_4.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\">Incorrect Coolant Use<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Many classic Commodores have suffered from poor coolant maintenance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Common Problems<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Corrosion<\/li>\n\n\n\n<li>Scale build-up<\/li>\n\n\n\n<li>Water pump wear<\/li>\n\n\n\n<li>Blocked radiators<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Plain water should never be used long-term.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Coolant for Early Commodores<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Penrite OEM Coolant<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Corrosion protection<\/li>\n\n\n\n<li>Improved cooling efficiency<\/li>\n\n\n\n<li>Long service intervals<\/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>Six-cylinder Commodores<\/li>\n\n\n\n<li>V8 Commodores<\/li>\n\n\n\n<li>Restored vehicles<\/li>\n<\/ul>\n\n\n<div id=\"fu_ebay_5\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 5 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_5\"><\/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;Penrite coolant<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_5 = null;\nvar waitForDepends_fu_ebay_5 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_5);\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_5 = jQuery(\"#fu_ebay_5\");\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 : \"Penrite coolant\",\nfu_ebay_query : \"Penrite coolant\",\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 : 5,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_5.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\">Airflow Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The cooling system relies on adequate airflow through the radiator.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Common Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Debris build-up<\/li>\n\n\n\n<li>Damaged radiator fins<\/li>\n\n\n\n<li>Missing shrouds<\/li>\n\n\n\n<li>Incorrect fan installation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Many owners underestimate the importance of the factory fan shroud.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Missing Fan Shrouds<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A missing shroud can significantly reduce cooling performance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Overheating in traffic<\/li>\n\n\n\n<li>Reduced airflow<\/li>\n\n\n\n<li>Higher operating temperatures<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Always retain or replace damaged shrouds.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Temperature Gauge Issues<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Sometimes the cooling system is functioning correctly, but the gauge is inaccurate.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fluctuating readings<\/li>\n\n\n\n<li>False overheating concerns<\/li>\n\n\n\n<li>Inconsistent temperatures<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Faulty sender unit<\/li>\n\n\n\n<li>Wiring issues<\/li>\n\n\n\n<li>Gauge deterioration<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Always verify actual engine temperature before diagnosing major cooling faults.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Diagnostic Tool<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Infrared Temperature Gun<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Instant temperature readings<\/li>\n\n\n\n<li>Accurate diagnostics<\/li>\n\n\n\n<li>Easy to use<\/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>Cooling system troubleshooting<\/li>\n\n\n\n<li>Preventative maintenance<\/li>\n<\/ul>\n\n\n<div id=\"fu_ebay_6\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 6 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_6\"><\/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;Infrared Temperature Gun<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_6 = null;\nvar waitForDepends_fu_ebay_6 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_6);\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_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 : \"Infrared Temperature Gun\",\nfu_ebay_query : \"Infrared Temperature Gun\",\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\">V8 Cooling Challenges<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The Holden 253 and 308 V8 generate more heat than the six-cylinder engines.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Common Issues<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Overheating in traffic<\/li>\n\n\n\n<li>Heat soak<\/li>\n\n\n\n<li>Higher under-bonnet temperatures<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Recommended Upgrades<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Aluminium radiator<\/li>\n\n\n\n<li>New fan clutch<\/li>\n\n\n\n<li>Quality coolant<\/li>\n\n\n\n<li>Correct fan shroud<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These upgrades dramatically improve reliability.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Six-Cylinder Cooling Issues<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The blue motor six is generally reliable but not immune to cooling problems.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Common Concerns<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Radiator blockage<\/li>\n\n\n\n<li>Water pump wear<\/li>\n\n\n\n<li>Thermostat failure<\/li>\n\n\n\n<li>Hose deterioration<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Regular maintenance usually prevents major issues.<\/p>\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\">This promotes corrosion and internal damage.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ignoring Small Leaks<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Small leaks eventually become major failures.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Removing the Thermostat<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This often reduces cooling efficiency rather than improving it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Neglecting Coolant Changes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Coolant should be replaced periodically to maintain corrosion protection.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Recommended Cooling System Reliability Package<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">For VB, VC, VH and VK Commodores, the ideal cooling package includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Aluminium radiator<\/li>\n\n\n\n<li>GMB water pump<\/li>\n\n\n\n<li>Tridon thermostat<\/li>\n\n\n\n<li>Gates hose kit<\/li>\n\n\n\n<li>Penrite coolant<\/li>\n\n\n\n<li>Fan clutch inspection or replacement<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This combination addresses most common cooling issues.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cooling system problems are among the most common issues affecting VB, VC, VH and VK Commodores today. Fortunately, most faults are caused by ageing components rather than design flaws. A blocked radiator, worn water pump or faulty thermostat can usually be diagnosed and repaired without major expense.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Regular coolant changes, proper maintenance and a few carefully chosen upgrades can dramatically improve reliability and reduce the risk of overheating.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Whether you&#8217;re maintaining a stock VH SL\/X, a VK Berlina, a VC V8 or a modified street machine, keeping the cooling system in top condition is one of the most important steps in preserving your classic Commodore 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\/16\/holden-253-308-v8-issues-explained\/\" type=\"post\" id=\"7340\">Holden 253 &amp; 308 V8 Issues Explained<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/16\/vb-vc-and-vh-commodore-rust-problems\/\" type=\"post\" id=\"7346\">VB, VC and VH Commodore Rust Problems<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/16\/how-to-inspect-an-early-commodore-before-buying\/\" type=\"post\" id=\"7348\">How to Inspect an Early Commodore Before Buying<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/16\/vb-vc-and-vh-commodore-transmission-problems\/\" type=\"post\" id=\"7358\">VB VC VH VK Commodore Transmission Problems<\/a><\/li>\n\n\n\n<li>Best Rust Prevention Products for Classic Commodores<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The VB, VC, VH and VK Commodore are among Australia&#8217;s most popular classic Holden models. Whether powered by a 2.85-litre six, 3.3-litre red\/ blue motor, 4.2-litre V8 or 5.0-litre V8, these early Commodores were designed to provide reliable performance in Australian conditions. However, after more than 40 years on the road, cooling system problems have [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":586,"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-7352","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>VB, VC, VH and VK 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