{"product_id":"performance-water-pump-thermostat-kit-for-jaguar-xj-2010-2019-5-0l","title":"Performance Water Pump \u0026 Thermostat Kit for Jaguar XJ (2010-2019) 5.0L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHeavy-Duty Water Pump \u0026amp; Thermostat Cooling Overhaul Kit for 2010-2019 Jaguar XJ (X351)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Performance Water Pump and Thermostat Kit replaces brittle factory cooling components on the 2010-2019 Jaguar XJ to prevent catastrophic coolant loss and maintain critical thermal regulation under boost.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Jaguar XJ Cooling System Weakness\u003c\/h3\u003e\n\u003cp\u003eThe factory cooling circuit on the \u003cstrong\u003eX351\u003c\/strong\u003e chassis relies on multi-piece molded plastic coolant crossover tubes, plastic thermostat housings, and composite bleeder plugs. Under the intense thermal cycling and under-hood heat soak generated by the supercharged \u003cstrong\u003eAJ133\u003c\/strong\u003e V8, these nylon-composite pipes become brittle, heat-cycle fatigue, and crack along ultrasonic weld seams. When these plastic pipes fracture, rapid coolant depressurization can cause sudden head gasket failure and cylinder head warping before dash sensors register overheating.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive cooling package replaces the notorious OEM failure points with structural aluminum coolant crossover pipes and reinforced copper fittings that withstand continuous elevated operating pressures and high-temperature thermal cycling. The included heavy-duty mechanical water pump features an upgraded bearing pack and shaft seal to mitigate cavitation at high engine RPM. Paired with a pre-assembled thermostat unit featuring an integrated coolant temperature sensor and a solid copper bleeder screw, this direct-replacement kit eliminates weak failure-prone plastic junctions entirely.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1x High-Flow Mechanical Water Pump\u003c\/li\u003e\n  \u003cli\u003e1x Thermostat Assembly with Integrated Sensor\u003c\/li\u003e\n  \u003cli\u003e1x Aluminum Coolant Crossover Pipe Assembly\u003c\/li\u003e\n  \u003cli\u003e1x Thermostat Outlet Hose with Copper Fittings\u003c\/li\u003e\n  \u003cli\u003e1x Copper Bleeder Screw \u0026amp; Crossover Plug\u003c\/li\u003e\n  \u003cli\u003e1x Heater Outlet Hose\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;\"\u003e2010-2019 Jaguar XJ\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;\"\u003e\n\u003cstrong\u003eAJ133\u003c\/strong\u003e \/ \u003cstrong\u003eX351\u003c\/strong\u003e\n\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;\"\u003e470 hp \/ 424 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;\"\u003e\n\u003cstrong\u003eAJ812119\u003c\/strong\u003e, \u003cstrong\u003eAJ813909\u003c\/strong\u003e, \u003cstrong\u003eC2D20660\u003c\/strong\u003e, \u003cstrong\u003eLR090630\u003c\/strong\u003e\n\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\u003e2010-2019 Jaguar XJ Supercharged (5.0L Supercharged V8)\u003c\/li\u003e\n  \u003cli\u003e2010-2019 Jaguar XJ Supersport \/ XJR \/ XJR575 (5.0L Supercharged V8)\u003c\/li\u003e\n  \u003cli\u003e2013-2019 Jaguar XJ 3.0L Supercharged V6 (AJ126 Engine Platform)\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 X351 XJ?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2010-2019 Jaguar XJ equipped with the \u003cstrong\u003eAJ133\u003c\/strong\u003e supercharged engine. \u003cstrong\u003eDoes not fit naturally aspirated 5.0L V8 models.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eDo I need to bleed the cooling circuit after installation?\u003c\/h4\u003e\n\u003cp\u003eYes, the supercharged cooling system requires a full vacuum evacuation and coolant bleed using the included copper bleeder screw to eliminate air pockets around the supercharger charge coolers.\u003c\/p\u003e\n\n\u003ch3\u003eThe Jaguar European Standard\u003c\/h3\u003e\n\u003cp\u003ePrecision-engineered to meet European tight-tolerance cooling specifications, this aluminum-upgraded cooling system preserves factory sensor calibration without throwing check engine lights while securing your high-displacement powertrain from catastrophic thermal breakdown.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67545308332280,"sku":"DS-EJ5YXS8UK","price":246.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/performance-water-pump-thermostat-kit-for-jaguar-xj-2010-2019-5-0l-1.jpg?v=1790721374","url":"https:\/\/performancechiptuning.com\/products\/performance-water-pump-thermostat-kit-for-jaguar-xj-2010-2019-5-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}