{"product_id":"performance-water-pump-kit-for-chevrolet-express-1500-2007-2014-5-3l","title":"Performance Water Pump Kit for Chevrolet Express 1500 (2007-2014) 5.3L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHeavy-Duty Water Pump and Thermostat Kit for 2007-2014 Chevrolet Express 1500 (GMT610)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Performance Water Pump Kit replaces the leak-prone factory mechanical pump on the 2007-2014 Chevrolet Express 1500 to maintain optimal coolant circulation and eliminate thermal runaway under heavy commercial loads.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Chevrolet Express 1500 Cooling Weakness\u003c\/h3\u003e\n\u003cp\u003eThe confined engine compartment of the **GMT610** chassis exposes cooling components to extreme thermal cycling. Over extended duty, the factory mechanical water pump on the **Vortec 5.3L LMF** engine suffers from shaft seal degradation, leading to coolant weeping through the front bearing inspection port. Once coolant breaches the unitized seal, rapid bearing contamination induces shaft play, pulley wobble, and potential belt misalignment. Furthermore, prolonged cyclic heat stress causes internal impeller erosion, generating cavitation at higher RPMs and degrading the gallon-per-minute (GPM) flow needed during fleet towing and high-ambient idling.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered to resolve fleet durability issues, this replacement assembly features an upgraded, heavy-duty mechanical seal and hardened internal bearings designed to handle high serpentine belt tension without radial runout. The precision-machined cast aluminum housing provides perfectly planar mounting surfaces, ensuring even torque distribution across the included rectangular and oval gaskets to prevent perimeter fluid leaks. Matched with an integrated OE-calibrated thermostat and housing, this kit restores laminar coolant flow through the block and radiator, preventing localized hot spots in high-duty cycle **Gen IV Small Block** engines.\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;\"\u003e2007-2014 Chevrolet Express 1500\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;\"\u003eVortec 5.3L V8 (LMF) \/ 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;\"\u003e310 hp \/ 334 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\u003e2007-2014 Chevrolet Express 1500 5.3L V8\u003c\/li\u003e\n  \u003cli\u003eVerify engine displacement and configuration before ordering.\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 GMT610 Express 1500?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2007-2014 Chevrolet Express 1500 equipped with the **5.3L LMF** engine. \u003cstrong\u003eVerify your engine displacement prior to purchase; this unit does not interchange with 4.3L V6 or 6.0L V8 cooling configurations.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eWhat torque procedure should be used during installation?\u003c\/h4\u003e\n\u003cp\u003eTorque all water pump mounting fasteners in two progressive passes to factory manufacturer specifications to avoid casting distortion and gasket failure.\u003c\/p\u003e\n\n\u003ch3\u003eThe Chevrolet Durability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to meet rigorous commercial fleet demands, this cooling assembly ensures maximum thermal stability and leak-free reliability when running extended idle routes or pulling near gross vehicle weight rating (GVWR).\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67545106514168,"sku":"DS-E6W7SSPEI","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-chevrolet-express-1500-2007-2014-5-3l-1.jpg?v=1790716812","url":"https:\/\/performancechiptuning.com\/products\/performance-water-pump-kit-for-chevrolet-express-1500-2007-2014-5-3l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}