{"product_id":"performance-water-pump-kit-for-chevrolet-express-3500-2003-2006-4-8l-6-0l","title":"Performance Water Pump Kit for Chevrolet Express 3500 (2003-2006) 4.8L 6.0L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHeavy-Duty Water Pump and Accessory Drive Kit for 2003-2006 Chevrolet Express 3500 (GMT610)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Performance Water Pump Kit restores critical thermal management and accessory drive tension on the 2003-2006 Chevrolet Express 3500 to prevent engine overheating and accessory belt slip under heavy commercial loads.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Chevrolet Express 3500 Cooling Drive Vulnerability\u003c\/h3\u003e\n\u003cp\u003eUnder demanding fleet cycles, continuous idling, and high-temp towing, factory cooling components on the \u003cstrong\u003eGMT610\u003c\/strong\u003e van encounter severe mechanical stress. The OEM water pump shaft bearings and dynamic unitized seals break down over time, causing shaft runout, impeller cavitation, and coolant weeping. Concurrently, factory belt tensioner dampening springs succumb to heat soak and fatigue, losing required preload. This induces harmonic belt chatter, parasitic drag, glaze-induced slippage, and reduced cooling flow across the \u003cstrong\u003eLR4\u003c\/strong\u003e and \u003cstrong\u003eLQ4\u003c\/strong\u003e engine architectures.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive service package replaces critical wear points with severe-duty components engineered for extended service intervals. The water pump features an OEM-grade cast aluminum housing and precision-balanced impeller that maximizes coolant velocity while preventing cavitation at sustained high RPMs. Upgraded internal bearings resist side-load deflection exerted by the accessory drive. Matched with heavy-duty EPDM serpentine belts, an integrated thermostat, and pre-calibrated mechanical tensioners, this kit directly supersedes OEM part numbers \u003cstrong\u003e12580162\u003c\/strong\u003e, \u003cstrong\u003e12609719\u003c\/strong\u003e, and \u003cstrong\u003e12560380\u003c\/strong\u003e to restore reliable cooling capacity.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100% style=\" border-collapse: collapse border: solid font-size: min-width:\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2003-2006 Chevrolet Express 3500\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e4.8L LR4, 6.0L LQ4 Vortec V8 \/ GMT610\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e285–300 hp \/ 295–360 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e12580162, 12609719, 12560380, 12562458, 12703898, 19195104\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2006 Chevrolet Express 3500 4.8L V8 (Vortec LR4)\u003c\/li\u003e\n  \u003cli\u003e2003-2005 Chevrolet Express 3500 6.0L V8 (Vortec LQ4)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the GMT610 Express 3500?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2003-2006 Chevrolet Express 3500 equipped with the 4.8L LR4 or 6.0L LQ4 Vortec engine.\u003c\/p\u003e\n\n\u003ch4\u003eDoes this kit include all necessary seals and replacement hardware?\u003c\/h4\u003e\n\u003cp\u003eYes, it comes fully equipped with the pre-assembled thermostat, mounting hardware, high-temperature O-rings, and die-cut water pump gaskets for a complete, leak-free installation.\u003c\/p\u003e\n\n\u003ch3\u003eThe Chevrolet Fleet Durability Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt to handle the punishing thermal demands of continuous commercial hauling, heavy towing, and utility van payloads, this cooling kit provides the hydraulic efficiency and mechanical strength needed to protect your Vortec V8 from downtime.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67544638128376,"sku":"DS-EJVO0HNPS","price":193.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/performance-water-pump-kit-for-chevrolet-express-3500-2003-2006-4-8l-6-0l-1.jpg?v=1790708370","url":"https:\/\/performancechiptuning.com\/fr\/products\/performance-water-pump-kit-for-chevrolet-express-3500-2003-2006-4-8l-6-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}