{"product_id":"performance-water-pump-kit-for-hummer-h3-h3t-2008-2010-5-3l","title":"Performance Water Pump Kit for Hummer H3,H3T (2008-2010) 5.3L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHeavy-Duty Performance Water Pump Kit for 2008-2010 Hummer H3,H3T (GMT345)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Performance Water Pump Kit replaces the leak-prone factory cooling pump on the 2008-2010 Hummer H3,H3T to restore pressurized coolant circulation and prevent catastrophic engine overheating under heavy loads.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Hummer H3,H3T Cooling System Vulnerability\u003c\/h3\u003e\n\u003cp\u003eFactory cooling systems on the \u003cstrong\u003eGMT345\u003c\/strong\u003e platform powered by the \u003cstrong\u003eLH8\u003c\/strong\u003e 5.3L V8 suffer premature shaft seal failure and bearing degradation due to severe thermal cycling and high engine bay heat soak. Over time, the stock mechanical seal hardens, causing coolant to weep through the drainage cavity and depressurize the system. Furthermore, factory stamped impellers can experience fluid cavitation at elevated RPM, leading to localized hotspotting, vapor pocket formation, and warped cylinder head surfaces during sustained trail crawling or heavy towing.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis direct-fit water pump assembly upgrades system reliability with a reinforced cast housing and heavy-duty, unitized dual-row bearings that withstand extreme radial serpentine belt loads. Fitted with an upgraded carbon-ceramic mechanical shaft seal, it eliminates weeping and holds dynamic cooling pressure reliably. The balanced internal impeller is engineered to prevent cavitation, ensuring uniform flow rates through the engine block and radiator cores. It includes a calibrated thermostat housing assembly, replacement hardware, and OEM-spec gaskets for an airtight, leak-free seal.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 Engine Water Pump\u003c\/li\u003e\n  \u003cli\u003e1 Thermostat Housing\u003c\/li\u003e\n  \u003cli\u003e1 Thermostat\u003c\/li\u003e\n  \u003cli\u003e2 Rectangular Gaskets\u003c\/li\u003e\n  \u003cli\u003e1 Oval Gasket\u003c\/li\u003e\n  \u003cli\u003e2 Mounting Bolts\u003c\/li\u003e\n\u003c\/ul\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;\"\u003e2008-2010 Hummer H3,H3T\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;\"\u003eLH8 5.3L V8 \/ GMT345\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 \/ 320 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;\"\u003e12681417, 12600767, AW6009\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\u003e2008-2010 Hummer H3 5.3L V8\u003c\/li\u003e\n  \u003cli\u003e2009-2010 Hummer H3T 5.3L V8\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the GMT345 H3,H3T?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2008-2010 Hummer H3,H3T equipped with the \u003cstrong\u003eLH8\u003c\/strong\u003e 5.3L V8 engine. \u003cstrong\u003eDoes not fit 3.5L (L52) or 3.7L (LLR) inline-5 engine configurations.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eDo I need to bleed the cooling system after installation?\u003c\/h4\u003e\n\u003cp\u003eYes, always perform a complete cooling system vacuum bleed or air purge to remove trapped air pockets and torque mounting bolts to factory specifications.\u003c\/p\u003e\n\n\u003ch3\u003eThe Hummer Caliber\u003c\/h3\u003e\n\u003cp\u003eThe Hummer \u003cstrong\u003eGMT345\u003c\/strong\u003e chassis requires unwavering cooling stability for harsh off-road trails and rigorous towing. Installing an upgraded water pump and thermostat kit safeguards your powertrain against thermal degradation, ensuring dependable heat management across demanding environments.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67545122734328,"sku":"DS-E2DXST9ON","price":108.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/performance-water-pump-kit-for-hummer-h3-h3t-2008-2010-5-3l-1.jpg?v=1790717252","url":"https:\/\/performancechiptuning.com\/es\/products\/performance-water-pump-kit-for-hummer-h3-h3t-2008-2010-5-3l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}