{"id":7422,"date":"2026-06-10T05:35:17","date_gmt":"2026-06-10T05:35:17","guid":{"rendered":"http:\/\/australianholden.com\/?p=7422"},"modified":"2026-06-21T04:42:06","modified_gmt":"2026-06-21T04:42:06","slug":"vl-commodore-cooling-system-problems","status":"publish","type":"post","link":"https:\/\/australianholden.com\/index.php\/2026\/06\/10\/vl-commodore-cooling-system-problems\/","title":{"rendered":"VL Commodore Cooling System Problems"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cooling system problems are one of the most critical issues affecting VL Commodores. These vehicles, produced between 1986 and 1988, are now over 35 years old and rely on ageing radiators, hoses, water pumps, and sensors that are highly prone to failure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The VL Commodore is especially sensitive to cooling system health because it uses the Nissan RB30E or RB30ET engine, which generates more heat and operates under tighter temperature tolerances than earlier Holden six-cylinder engines.<\/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;Cooling System<\/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 : \"Cooling System\",\nfu_ebay_query : \"VL Commodore Cooling System\",\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\">Why VL Cooling Systems Fail<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Cooling system failure in VL Commodores is usually caused by age and neglect.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Main Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Old or blocked radiators<\/li>\n\n\n\n<li>Cracked rubber hoses<\/li>\n\n\n\n<li>Failing water pumps<\/li>\n\n\n\n<li>Thermostat issues<\/li>\n\n\n\n<li>Poor coolant maintenance<\/li>\n\n\n\n<li>Air pockets in the system<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Because these vehicles are now classic cars, most original cooling components are well past their service life.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">1. Overheating Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Overheating is the most serious cooling issue in VL Commodores.<\/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 rising quickly<\/li>\n\n\n\n<li>Steam from engine bay<\/li>\n\n\n\n<li>Loss of power under load<\/li>\n\n\n\n<li>Coolant boiling in overflow tank<\/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>Blocked or corroded radiator<\/li>\n\n\n\n<li>Faulty thermostat<\/li>\n\n\n\n<li>Weak water pump<\/li>\n\n\n\n<li>Air trapped in cooling system<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Even short overheating events can cause head gasket damage in RB engines.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">2. Radiator Failure<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Radiators are a major weak point in VL Commodores.<\/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>Rust-coloured coolant<\/li>\n\n\n\n<li>Poor temperature control<\/li>\n\n\n\n<li>Hot engine at idle<\/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>Clogged radiator core<\/li>\n\n\n\n<li>Age-related deterioration<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">VL Turbo models are especially hard on radiators due to increased heat load.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">3. Water Pump Failure<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The water pump is essential for coolant circulation.<\/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 area<\/li>\n\n\n\n<li>Bearing noise<\/li>\n\n\n\n<li>Overheating at idle or low speed<\/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 failure<\/li>\n\n\n\n<li>Age-related breakdown<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Failure often leads to rapid overheating.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">4. Thermostat Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The thermostat regulates engine operating temperature.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Engine running too hot or too cold<\/li>\n\n\n\n<li>Temperature fluctuations<\/li>\n\n\n\n<li>Slow warm-up<\/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>Stuck closed thermostat<\/li>\n\n\n\n<li>Worn internal components<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A faulty thermostat is a common hidden cause of overheating.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">5. Coolant Hose Deterioration<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Rubber hoses degrade over time.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Visible cracks or bulging hoses<\/li>\n\n\n\n<li>Coolant leaks<\/li>\n\n\n\n<li>Sudden hose failure<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Hose Areas<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Upper radiator hose<\/li>\n\n\n\n<li>Lower radiator hose<\/li>\n\n\n\n<li>Heater hoses<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Old hoses are one of the most common roadside failure points.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">6. Air Locks in Cooling System<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Air trapped in the system reduces cooling efficiency.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Temperature spikes<\/li>\n\n\n\n<li>Gurgling sounds<\/li>\n\n\n\n<li>Inconsistent 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>Improper bleeding after service<\/li>\n\n\n\n<li>Low coolant levels<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">VL engines must be carefully bled after cooling system work.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">7. Heater Core Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Heater cores often fail due to corrosion.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Damp passenger footwell<\/li>\n\n\n\n<li>Sweet coolant smell inside cabin<\/li>\n\n\n\n<li>Weak or no cabin heat<\/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>Old coolant breakdown<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Heater core replacement is labour-intensive.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">8. Coolant Contamination<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Old or incorrect coolant causes internal damage.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rusty or dirty coolant<\/li>\n\n\n\n<li>Sludge in radiator<\/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>Neglected maintenance<\/li>\n\n\n\n<li>Mixing coolant types<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Regular flushing is essential.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">9. Fan and Cooling Relay Issues<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Cooling fans are critical in low-speed traffic.<\/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>Poor idle 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>Failed fan relay<\/li>\n\n\n\n<li>Electric fan motor failure (some VL setups)<\/li>\n\n\n\n<li>Mechanical fan clutch wear (if fitted)<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">10. Temperature Sensor Faults<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Faulty sensors can cause incorrect readings.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Erratic temperature gauge<\/li>\n\n\n\n<li>False overheating warnings<\/li>\n\n\n\n<li>Poor cold-start enrichment (EFI models)<\/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>Sensor failure<\/li>\n\n\n\n<li>Wiring corrosion<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">VL Turbo Cooling Challenges<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">VL Turbo models generate significantly more heat.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Common Issues<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Higher operating temperatures<\/li>\n\n\n\n<li>Heat soak in engine bay<\/li>\n\n\n\n<li>Increased radiator stress<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Required Upgrades<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>High-flow aluminium radiator<\/li>\n\n\n\n<li>Improved intercooler airflow<\/li>\n\n\n\n<li>Quality coolant with corrosion protection<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Best Radiator Upgrade for VL Commodore<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Aluminium High-Flow 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 in traffic and heat<\/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 driven VL Commodores<\/li>\n\n\n\n<li>Modified or turbocharged engines<\/li>\n\n\n\n<li>Hot climate conditions<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Best Coolant for VL Commodores<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Type<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Long-life ethylene glycol coolant<\/li>\n\n\n\n<li>Mixed to manufacturer specifications<\/li>\n<\/ul>\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>Stable operating temperature<\/li>\n\n\n\n<li>Improved component lifespan<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Preventative Maintenance Tips<\/h1>\n\n\n\n<h3 class=\"wp-block-heading\">Flush Coolant Regularly<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Every 2\u20133 years recommended.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Replace Hoses Proactively<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Prevents sudden roadside failures.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Inspect Radiator Condition<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Check for corrosion or blockage.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Maintain Proper Coolant Levels<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Low coolant is an early warning sign of failure.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Warning Signs of Cooling Failure<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rising temperature gauge<\/li>\n\n\n\n<li>Coolant leaks under vehicle<\/li>\n\n\n\n<li>Sweet smell from engine bay<\/li>\n\n\n\n<li>Heater not working properly<\/li>\n\n\n\n<li>Frequent coolant top-ups<\/li>\n\n\n\n<li><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Cooling system problems in VL Commodores are extremely common due to age and the higher heat demands of the RB30 engine. Radiators, water pumps, hoses, and thermostats all become failure points over time.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Preventative maintenance is critical. Addressing small issues early and upgrading key components such as the radiator and hoses can significantly improve reliability and prevent engine damage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With proper care and upgrades, the VL Commodore cooling system can remain reliable even under demanding driving conditions.<\/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\/14\/vk-vl-commodore-cooling-system-problems\/\" type=\"post\" id=\"7397\">VK Commodore Cooling System Problems<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/10\/vk-vl-starting-problems-guide\/\" type=\"post\" id=\"7415\">VL Commodore Starting Problems Guide<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/14\/vk-vl-commodore-electrical-problems\/\" type=\"post\" id=\"7411\">VK, VL Commodore Electrical Problems<\/a><\/li>\n\n\n\n<li>VL Commodore Buying Guide<\/li>\n\n\n\n<li>Best Coolant for Old Commodore Engines<\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/14\/how-to-inspect-a-vk-vl-commodore-before-buying\/\" type=\"post\" id=\"7393\">How to Inspect a VK or VL Commodore Before Buying<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cooling system problems are one of the most critical issues affecting VL Commodores. These vehicles, produced between 1986 and 1988, are now over 35 years old and rely on ageing radiators, hoses, water pumps, and sensors that are highly prone to failure. The VL Commodore is especially sensitive to cooling system health because it uses [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3465,"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-7422","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>VL Commodore Cooling System Problems - Australian Holden<\/title>\n<meta name=\"description\" content=\"Cooling system problems are one of the most critical issues affecting VL Commodores. 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