{"product_id":"performance-water-pump-kit-for-gmc-envoy-2003-2006-5-3l","title":"Performance Water Pump Kit for GMC Envoy (2003-2006) 5.3L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHeavy-Duty Cooling System \u0026amp; Accessory Drive Water Pump Kit for 2003-2006 GMC Envoy (GMT360)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Performance Water Pump Kit replaces the leak-prone factory coolant pump, degraded tensioner, and glazed drive belts on the 2003-2006 Envoy to restore coolant circulation volume and maintain correct accessory belt tension under load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock GMC Envoy Mechanical Seal Failure\u003c\/h3\u003e\n\u003cp\u003eFactory cooling systems on the \u003cstrong\u003eGMT360\u003c\/strong\u003e platform powered by the \u003cstrong\u003eLM4\u003c\/strong\u003e and \u003cstrong\u003eLH6\u003c\/strong\u003e 5.3L V8 frequently suffer from dynamic seal degradation and bearing galling caused by continuous accessory belt side-loads. Thermal cycling between cold starts and operating temperatures breaks down the OEM elastomeric shaft seal, allowing pressurized coolant to contaminate internal cartridge bearings and exit through the weep hole. Simultaneously, factory spring-damped tensioners lose torsional resistance, causing belt slippage, localized heat buildup, and harmonic vibration that damages adjacent accessory pulleys.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eManufactured using a high-pressure die-cast aluminum housing, this complete assembly integrates a heavy-duty unitized shaft seal alongside precision ground bearings to mitigate lateral runout and resist cavitation under high-RPM operation. The kit includes a pre-assembled thermostat housing and high-temp gaskets to restore thermal regulation without leaks. To eliminate accessory slip, high-tensile EPDM serpentine belts and an upgraded spring-damped belt tensioner assembly ensure precise belt alignment and sustained tension. This kit directly supersedes OE reference numbers \u003cstrong\u003e12580162\u003c\/strong\u003e, \u003cstrong\u003e12609719\u003c\/strong\u003e, and \u003cstrong\u003e12560380\u003c\/strong\u003e.\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: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\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 GMC Envoy\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;\"\u003eLM4 \/ LH6 Vortec 5.3L V8 \/ GMT360\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;\"\u003e290-300 hp \/ 325-330 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\u003e2003-2006 GMC Envoy 5.3L V8\u003c\/li\u003e\n  \u003cli\u003e2003-2006 GMC Envoy XL 5.3L V8\u003c\/li\u003e\n  \u003cli\u003e2004-2005 GMC Envoy XUV 5.3L V8\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the GMT360 Envoy?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2003-2006 GMC Envoy equipped with the \u003cstrong\u003eLM4\u003c\/strong\u003e and \u003cstrong\u003eLH6\u003c\/strong\u003e 5.3L Vortec V8 engine.\u003c\/p\u003e\n\n\u003ch4\u003eShould the cooling system be flushed prior to installation?\u003c\/h4\u003e\n\u003cp\u003eYes, draining and flushing the cooling system is necessary to clear abrasive debris and scale that can score the new mechanical shaft seal.\u003c\/p\u003e\n\n\u003ch3\u003eThe GMC Heavy-Duty Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt to handle heavy towing, elevated thermal loads, and rigorous service cycles, this comprehensive water pump and drive belt kit restores OEM cooling efficiency and accessory drive integrity for demanding truck and SUV applications.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67544677187832,"sku":"DS-E6I47VYT2","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-gmc-envoy-2003-2006-5-3l-1.jpg?v=1790708787","url":"https:\/\/performancechiptuning.com\/products\/performance-water-pump-kit-for-gmc-envoy-2003-2006-5-3l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}