{"product_id":"jtl-parts-coolant-reservoir-tank-603-5403-engine-coolant-expansion-tank-radiator-overflow-reservoir-replacement-for-n5346001-t1673008-st6000-heavy-duty-application","title":"JTL Parts Coolant Reservoir Tank 603-5403 (Engine Coolant Expansion Tank \/ Radiator Overflow Reservoir) – Replacement for N5346001 \/ T1673008 \/ ST6000 – Heavy Duty Application","description":"\u003cdiv style=\"font-family: Arial, sans-serif; line-height: 1.6; color: #222;\"\u003e\n\n  \u003ch2\u003eCOOLANT RESERVOIR 603-5403 Engine Coolant Tank\u003c\/h2\u003e\n  \u003ch3\u003eReplacement for 603-5403 \/ N5346001 – Heavy Duty Application\u003c\/h3\u003e\n\n  \u003cp\u003e\n    The \u003cstrong\u003eCoolant Reservoir 603-5403\u003c\/strong\u003e is designed for heavy-duty trucks, \n    providing a reliable storage and pressure control system for engine coolant. \n    This reservoir helps maintain proper coolant levels, prevents overheating, \n    and ensures stable engine temperature under demanding operating conditions.\n  \u003c\/p\u003e\n\n  \u003chr\u003e\n\n  \u003ch3\u003eProduct Details\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 603-5403\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Engine Coolant Reservoir (Expansion Tank)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Cooling System\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCross Reference:\u003c\/strong\u003e 603-5403, N5346001, T1673008, ST6000, 5751023\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eKey Benefits\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eMaintains proper coolant level in the system\u003c\/li\u003e\n    \u003cli\u003eHelps prevent engine overheating\u003c\/li\u003e\n    \u003cli\u003eBuilt for high-pressure cooling systems\u003c\/li\u003e\n    \u003cli\u003eDurable construction for heavy-duty applications\u003c\/li\u003e\n    \u003cli\u003eEnsures stable engine temperature control\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eFunction\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eStores excess coolant during thermal expansion\u003c\/li\u003e\n    \u003cli\u003eReturns coolant to the system as needed\u003c\/li\u003e\n    \u003cli\u003eMaintains pressure balance in the cooling system\u003c\/li\u003e\n    \u003cli\u003eSupports consistent engine cooling performance\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eHigh-Quality Construction\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eHigh-strength reinforced plastic body\u003c\/li\u003e\n    \u003cli\u003eHeat and vibration resistant design\u003c\/li\u003e\n    \u003cli\u003eIncludes pressure-rated cap (15 PSI)\u003c\/li\u003e\n    \u003cli\u003eOEM-style fit and durability\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eVehicle Fitment\u003c\/h3\u003e\n  \u003cp\u003e\n    Compatible with heavy-duty trucks such as:\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eKenworth Trucks\u003c\/li\u003e\n    \u003cli\u003ePeterbilt Trucks\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eFits Models\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eKenworth T600 \/ T800 \/ W900\u003c\/li\u003e\n    \u003cli\u003ePeterbilt 365 \/ 367 \/ 386 \/ 389\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cp\u003e\n    \u003cstrong\u003eNote:\u003c\/strong\u003e Fitment may vary depending on engine and configuration. \n    Always verify part number before purchase.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eReplaces \/ Cross Reference Numbers\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e603-5403\u003c\/li\u003e\n    \u003cli\u003eN5346001\u003c\/li\u003e\n    \u003cli\u003eT1673008\u003c\/li\u003e\n    \u003cli\u003e5751023\u003c\/li\u003e\n    \u003cli\u003eST6000 \/ ST6001 \/ ST6002\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eInstallation\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eDirect replacement design\u003c\/li\u003e\n    \u003cli\u003eIncludes mounting points for easy installation\u003c\/li\u003e\n    \u003cli\u003eNo modifications required\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003ePackage Includes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e1 x Coolant Reservoir\u003c\/li\u003e\n    \u003cli\u003e1 x Pressure Cap\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n\u003c\/div\u003e","brand":"JTL Parts","offers":[{"title":"Default Title","offer_id":53273620119917,"sku":null,"price":0.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0974\/3243\/7101\/files\/22.png?v=1777565486","url":"https:\/\/www.jtlparts.com\/products\/jtl-parts-coolant-reservoir-tank-603-5403-engine-coolant-expansion-tank-radiator-overflow-reservoir-replacement-for-n5346001-t1673008-st6000-heavy-duty-application","provider":"JTL Parts","version":"1.0","type":"link"}