{"id":6532,"date":"2026-05-30T04:49:51","date_gmt":"2026-05-30T04:49:51","guid":{"rendered":"http:\/\/australianholden.com\/?page_id=6532"},"modified":"2026-05-30T04:50:12","modified_gmt":"2026-05-30T04:50:12","slug":"vz-commodore-cooling-system","status":"publish","type":"page","link":"https:\/\/australianholden.com\/index.php\/home\/commodores\/vz-commodore\/vz-commodore-cooling-system\/","title":{"rendered":"VZ Commodore Cooling System"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/australianholden.com\/index.php\/australian-holden\/commodores\/vz-commodore\/\" type=\"page\" id=\"67\">VZ Commodore<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Previous: VY Commodore Cooling System<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Next: VE Commodore Cooling System<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The VZ Commodore arrived in 2004 at an interesting point in Holden\u2019s history. On the surface it looked like a facelifted VY, but underneath there were some major engineering changes\u2014particularly under the bonnet. The old Ecotec V6 was finally retired, replaced by the far more modern Alloytec engine family, and with that came an entirely different approach to cooling system design.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Compared to earlier Commodores, the VZ cooling system was more compact, more electronically controlled, and significantly more sensitive to maintenance quality. Holden had to manage tighter emissions laws, increased engine bay temperatures, and improved fuel economy targets, all while still building a car capable of surviving Australian summers, towing duties, and endless stop-start city driving.<\/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;VZ Commodore<\/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 : \"VZ Commodore\",\nfu_ebay_query : \"VZ Commodore Cooling\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 0,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_0.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<p class=\"wp-block-paragraph\">Done properly, the VZ cooling package works extremely well. Neglected, it quickly becomes one of the car\u2019s biggest weak points.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cooling System Overview<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The VZ Commodore used a fully pressurised liquid cooling system featuring:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; Aluminium crossflow radiator<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; Electric thermo fan assembly<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; Belt-driven water pump<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; Thermostat-controlled coolant flow<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; Pressurised coolant reservoir<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; Integrated transmission cooler on automatic models<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; ECU-controlled fan operation on Alloytec-equipped variants<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cooling system layouts varied depending on engine type, transmission, and performance level.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Radiator Design<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The VZ Commodore used an aluminium crossflow radiator with plastic end tanks.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Characteristics:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; lightweight construction<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; improved heat dissipation over older copper-brass radiators<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; efficient airflow packaging<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; compact engine bay integration<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Common issues:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The plastic end tanks are now a major age-related failure point.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Typical problems include:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; tank cracking near hose necks<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; seam leaks<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; coolant residue around crimps<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; pressure-related fatigue failures<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In Australian conditions, many original VZ radiators are now well beyond their ideal service life.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Thermo Fan System<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike older Commodores that relied heavily on engine-driven fans, the VZ made greater use of ECU-controlled electric thermo fans.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Benefits:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; improved fuel economy<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; reduced parasitic engine drag<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; quieter operation<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; more precise temperature management<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Fan behaviour:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Alloytec-powered VZs in particular run their fans aggressively once temperatures rise, especially with air conditioning engaged.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is completely normal and part of Holden\u2019s emissions-focused thermal strategy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Water Pump<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The VZ Commodore used a belt-driven centrifugal water pump across the range.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Functions:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; circulate coolant through engine block and cylinder heads<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; maintain stable operating temperatures<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; support heater core flow<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; assist thermal recovery after heavy load<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Common Water Pump Problems<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As mileage increases, water pump wear becomes extremely common.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Symptoms include:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; coolant leaks from weep hole<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; bearing noise or pulley wobble<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; overheating during traffic conditions<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; coolant smell after shutdown<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alloytec V6 models are particularly sensitive to reduced coolant circulation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Thermostat System<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The VZ introduced more sophisticated thermostat calibration compared to earlier Commodores.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Characteristics:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; faster warm-up for emissions control<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; tighter temperature regulation<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; improved fuel economy consistency<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; electronically assisted thermal management strategies<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Common Thermostat Issues<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thermostat failures are extremely common on VZ Alloytec engines.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Symptoms:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; fluctuating temperature readings<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; overheating at idle<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; poor heater performance<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; coolant temperature warnings<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because the Alloytec operates at relatively high temperatures, thermostat problems can escalate quickly if ignored.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Coolant Specifications<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The VZ Commodore requires long-life coolant designed specifically for alloy engines.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Recommended coolant characteristics:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; OAT (Organic Acid Technology) coolant<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; aluminium-safe chemistry<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; corrosion inhibitors<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; long service interval compatibility<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Why Coolant Quality Matters<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Modern alloy engines are far less forgiving than older Holden sixes and V8s.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Incorrect coolant or neglected servicing can cause:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; internal corrosion<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; electrolysis damage<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; heater core blockage<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; water pump seal wear<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; sludge formation in coolant galleries<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Regular coolant changes are essential on Alloytec-powered VZs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Common VZ Cooling System Problems<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Radiator Tank Failure<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One of the most common VZ cooling issues.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Symptoms:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; coolant smell after driving<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; gradual coolant loss<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; visible staining around radiator tanks<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Thermostat Failure<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Especially common on Alloytec V6 models.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Symptoms:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; overheating warnings<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; fluctuating temperature gauge<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; heater inconsistency<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Coolant Leaks from Crossover Pipes<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Alloytec\u2019s coolant crossover design can develop leaks over time.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Symptoms:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; unexplained coolant loss<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; coolant smell near intake manifold area<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; residue around coolant fittings<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Thermo Fan Problems<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Symptoms:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; overheating in traffic<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; poor air conditioning performance<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; fan constantly running or failing to engage<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cooling System Service Components<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Water Pump<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Typical replacement window:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; 120,000\u2013180,000 km<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Radiator<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Common lifespan:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; 10\u201315 years before tank fatigue appears<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Thermostat<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Preventative replacement commonly performed around:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; 100,000\u2013150,000 km<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Coolant<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Recommended interval:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; every 5 years or 100,000 km<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Best Cooling Upgrades for VZ Commodore<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The VZ platform benefits heavily from preventative cooling upgrades.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Popular upgrades include:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; full aluminium radiators<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; upgraded thermo fan assemblies<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; low-temperature thermostats<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; silicone radiator hoses<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; alloy overflow tanks<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; external transmission coolers<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; upgraded oil coolers for performance applications<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cooling Upgrades for Modified VZs<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Modified LS-powered VZs generate significantly more heat than factory cooling systems were designed to manage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Common supporting upgrades:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; thicker radiator cores<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; higher-flow water pumps<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; upgraded fan control tuning<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; improved airflow ducting<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uf0b7&nbsp; coolant expansion tank upgrades<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A healthy VZ cooling system works brilliantly. An ignored one becomes expensive very quickly<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/australianholden.com\/index.php\/australian-holden\/commodores\/vz-commodore\/\" type=\"page\" id=\"67\">VZ Commodore<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Previous: VY Commodore Cooling System<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Next: VE Commodore Cooling System<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>VZ Commodore Previous: VY Commodore Cooling System Next: VE Commodore Cooling System The VZ Commodore arrived in 2004 at an interesting point in Holden\u2019s history. On the surface it looked like a facelifted VY, but underneath there were some major engineering changes\u2014particularly under the bonnet. The old Ecotec V6 was finally retired, replaced by the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":598,"parent":67,"menu_order":16,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"class_list":["post-6532","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>VZ Commodore Cooling System - Australian Holden<\/title>\n<meta name=\"description\" content=\"Compared to earlier Commodores, the VZ cooling system was more compact, more electronically controlled, and significantly more sensitive to maintenance quality\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/australianholden.com\/index.php\/home\/commodores\/vz-commodore\/vz-commodore-cooling-system\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"VZ Commodore Cooling System - 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