{"product_id":"aluminum-coolant-overflow-expansion-tank-for-lincoln-navigator-2018-2024-3-5l","title":"Aluminum Coolant Overflow Expansion Tank for Lincoln Navigator (2018-2024) 3.5L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHeavy-Duty Aluminum Coolant Overflow Expansion Tank for 2018-2024 Lincoln Navigator (U554)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Aluminum Coolant Overflow Expansion Tank replaces the leak-prone factory plastic degas bottle on the 2018-2024 Lincoln Navigator to prevent cooling system depressurization and chronic coolant loss.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Lincoln Navigator Degas Bottle Failure\u003c\/h3\u003e\n\u003cp\u003eThe factory cooling reservoir on the \u003cstrong\u003eU554\u003c\/strong\u003e platform is constructed from blow-molded nylon plastic that deteriorates prematurely under heavy thermal cycling. Radiator surge cycles, underhood heat soak, and constant pressurized expansion cause the OEM polymer to oxidize, turn brittle, and yellow. Failure typically occurs along the center sonic-welded mold seam and at the fragile quick-connect hose barbs, resulting in hairline fissures, weeping coolant, engine bay vapor, and loss of critical cooling system operating pressure.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered as a permanent fix, this expansion tank is fabricated from aircraft-grade aluminum sheet with precision CNC-formed panels and fully TIG-welded external seams. Unlike molded plastic, ductile aluminum handles continuous system pressure without ballooning, seam separation, or stress cracking. The tank features precision-machined hose connections engineered to accept OEM quick-disconnect fittings directly, replacing OEM part number \u003cstrong\u003eFL3Z-8A080-A\u003c\/strong\u003e. Every unit undergoes 100% pneumatic pressure testing prior to dispatch to help ensure a leak-free seal under maximum cooling demand.\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;\"\u003e2018-2024 Lincoln Navigator\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;\"\u003e3.5L EcoBoost D35 Twin-Turbo V6 \/ U554\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;\"\u003e450 hp \/ 510 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;\"\u003eFL3Z-8A080-A\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\u003e2018-2024 Lincoln Navigator 3.5L Twin Turbo V6\u003c\/li\u003e\n  \u003cli\u003e2018-2024 Lincoln Navigator L 3.5L Twin Turbo V6\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the U554 Navigator?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2018-2024 Lincoln Navigator equipped with the \u003cstrong\u003e3.5L EcoBoost D35\u003c\/strong\u003e engine.\u003c\/p\u003e\n\n\u003ch4\u003eCan I reuse my factory radiator cap and coolant hoses?\u003c\/h4\u003e\n\u003cp\u003eYes, this tank retains OEM-spec neck threading and inlet\/outlet barb diameters for standard factory cap and hose reuse.\u003c\/p\u003e\n\n\u003ch3\u003eThe Lincoln Durability Standard\u003c\/h3\u003e\n\u003cp\u003eWhether navigating stop-and-go city traffic or operating at peak gross combined weight ratings while towing heavy loads, this all-aluminum expansion tank ensures cooling system integrity without the threat of catastrophic plastic reservoir failure.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67524681040120,"sku":"DS-EM6W233FF","price":278.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/aluminum-coolant-overflow-expansion-tank-for-lincoln-navigator-2018-2024-3-5l-1.webp?v=1790462844","url":"https:\/\/performancechiptuning.com\/products\/aluminum-coolant-overflow-expansion-tank-for-lincoln-navigator-2018-2024-3-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}