{"product_id":"performance-water-pump-kit-for-gmc-sierra-2500-1999-2004-6-0l","title":"Performance Water Pump Kit for GMC Sierra 2500 (1999-2004) 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 1999-2004 GMC Sierra 2500 (GMT800)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Performance Water Pump Kit replaces worn cooling and front-end accessory drive components on the 1999-2004 GMC Sierra 2500 to restore thermal regulation, prevent coolant cavitation, and eliminate belt slip under heavy load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock GMC Sierra 2500 Thermal Fatigue and Tensioner Decay\u003c\/h3\u003e\n\u003cp\u003eFactory cooling components on high-mileage \u003cstrong\u003eGMT800\u003c\/strong\u003e trucks running the \u003cstrong\u003eVortec 6.0L LQ4\u003c\/strong\u003e suffer chronic degradation over time. The stock water pump mechanical shaft seal hardens from thermal cycling, resulting in coolant weeping through the weep hole and subsequent front bearing failure. Concurrently, factory spring-loaded belt tensioners lose torsional damping, allowing the serpentine belt to flutter under high accessory loads like heavy alternator draw or air conditioning engagement. This slack causes belt glazing, chirping, parasitic drag, and inconsistent coolant flow rates across the engine block during heavy towing.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive service kit upgrades your front-end drive with an aluminum housing water pump engineered to maintain uniform coolant velocity across the cylinder heads. Featuring precision internal impellers, a high-temperature mechanical shaft seal, and an integrated OE-rated thermostat, it resists cavitation and eliminates boiling hot spots. The assembly includes a heavy-duty cast-iron spring tensioner with a low-friction sealed pulley bearing, alongside premium EPDM serpentine belts that resist rib cracking and high-temp elongation. Gaskets, O-rings, and hardware are included to ensure zero-leak installation over factory references \u003cstrong\u003e12580162\u003c\/strong\u003e and \u003cstrong\u003e12609719\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;\"\u003e1999-2004 GMC Sierra 2500\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;\"\u003e6.0L Vortec LQ4 \/ GMT800\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;\"\u003e300 hp \/ 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\u003e1999-2004 GMC Sierra 2500 Base 6.0L V8 (GMT800)\u003c\/li\u003e\n  \u003cli\u003e1999-2004 GMC Sierra 2500 SLE 6.0L V8 (GMT800)\u003c\/li\u003e\n  \u003cli\u003e1999-2004 GMC Sierra 2500 SLT 6.0L V8 (GMT800)\u003c\/li\u003e\n  \u003cli\u003e2001-2004 GMC Sierra 2500 HD 6.0L V8 (GMT800)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the GMT800 Sierra 2500?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 1999-2004 GMC Sierra 2500 equipped with the 6.0L Vortec LQ4 engine.\u003c\/p\u003e\n\n\u003ch4\u003eDoes this kit include both the main serpentine drive belt and the A\/C compressor belt?\u003c\/h4\u003e\n\u003cp\u003eYes, this kit supplies both the accessory serpentine drive belt and the dedicated A\/C compressor belt along with the tensioner assembly.\u003c\/p\u003e\n\n\u003ch3\u003eThe GMC Heavy-Duty Towing Standard\u003c\/h3\u003e\n\u003cp\u003eWhen pulling heavy equipment or steep mountain grades, cooling stability is non-negotiable. This complete cooling and belt drive package restores consistent thermal regulation and structural belt grip, ensuring reliable operation under maximum gross vehicle weight.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67544651038968,"sku":"DS-ESIRZ3I49","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-sierra-2500-1999-2004-6-0l-1.jpg?v=1790708510","url":"https:\/\/performancechiptuning.com\/fr\/products\/performance-water-pump-kit-for-gmc-sierra-2500-1999-2004-6-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}