{"product_id":"dorman-front-pressurized-coolant-reservoir-with-cap-for-cadillac-chevy-gmc-direct-replacement-thermoplastic","title":"Dorman Front Pressurized Coolant Reservoir with Cap for Cadillac Chevy GMC - Direct Replacement, Thermoplastic","description":"\u003cp\u003e\u003cb\u003eDorman 603-054 is a direct-replacement front pressurized engine coolant reservoir with cap engineered to restore proper coolant containment and fit the original mounting and hose connections on compatible Cadillac, Chevrolet and GMC models.\u003c\/b\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis replacement coolant overflow bottle is manufactured from durable thermoplastic and supplied with a preinstalled cap so you can quickly return a vehicle’s cooling system to service. It’s built to match the form, mounting points and hose ports of the factory part so installation is straightforward for DIYers or professional technicians. Before ordering, confirm vehicle compatibility using your trim and year in the garage tool to ensure the Confirmed Fit indicator applies to your specific model.\u003c\/p\u003e\n\n\u003ch3\u003eWhat vehicles does this reservoir fit?\u003c\/h3\u003e\n\n\u003cp\u003eThe Dorman 603-054 reservoir is made for a range of late-2000s and 2010s Cadillac, Chevrolet and GMC full-size SUVs and trucks, including Escalade, Silverado, Sierra, Tahoe, Suburban, Yukon and Avalanche models. Fitment covers multiple model years and variants—see the garage tool for exact matching by trim.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eCompatible with Cadillac Escalade, Escalade ESV and Escalade EXT years listed in the fitment tool.\u003c\/li\u003e\n  \u003cli\u003eFits Chevrolet Silverado 1500\/2500\/3500, Tahoe, Suburban, Avalanche and Cheyenne across specified years.\u003c\/li\u003e\n  \u003cli\u003eCompatible with GMC Sierra 1500\/2500HD\/3500HD and Yukon\/Yukon XL models in the listed years.\u003c\/li\u003e\n  \u003cli\u003eAlways verify fit using the Confirmed Fit bar and any fitment notes shown by the garage tool.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this reservoir match the original part?\u003c\/h3\u003e\n\n\u003cp\u003eDorman engineered this reservoir to reproduce the original unit’s fit and functional points so mounting tabs, hose connections and cap sealing mimic factory geometry. The cap is pressurized and included, reducing the number of parts you need to source separately.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eFactory-like mounting locations for bolt-in installation.\u003c\/li\u003e\n  \u003cli\u003eCorrect hose port sizes and orientation for easy connection.\u003c\/li\u003e\n  \u003cli\u003eSupplied with a pressurized cap to maintain proper coolant system pressure.\u003c\/li\u003e\n  \u003cli\u003eBuilt from heat- and vibration-resistant thermoplastic for underhood durability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the durability and quality features?\u003c\/h3\u003e\n\n\u003cp\u003eThis reservoir is produced from materials chosen to resist underhood heat, coolant exposure and engine vibration. Dorman leverages long aftermarket experience to deliver parts designed for practical longevity and dependable performance in routine driving conditions.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eHigh-temperature thermoplastic construction resists warping and cracking.\u003c\/li\u003e\n  \u003cli\u003eVibration-tolerant design helps prevent stress fractures at mounting points.\u003c\/li\u003e\n  \u003cli\u003ePreinstalled cap ensures correct sealing and system pressurization from day one.\u003c\/li\u003e\n  \u003cli\u003eManufactured and inspected to meet aftermarket fit-and-function expectations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I install this coolant reservoir myself?\u003c\/h3\u003e\n\n\u003cp\u003eInstallation is typically straightforward for anyone comfortable working in the engine bay. Basic steps include draining the recommended amount of coolant if needed, disconnecting hoses and sensors, unbolting the old reservoir, transferring any hardware or sensors as required, and bolting the new unit into place before refilling and bleeding the cooling system per manufacturer guidance.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003ePark on a level surface and allow the engine to cool completely before starting.\u003c\/li\u003e\n  \u003cli\u003eDisconnect negative battery terminal if accessing electrical connectors or sensors.\u003c\/li\u003e\n  \u003cli\u003eRemove hoses and mounting bolts, transfer any sensors, then install the new reservoir.\u003c\/li\u003e\n  \u003cli\u003eRefill coolant and run the engine to check for leaks and proper level; follow vehicle-specific bleed procedure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Dorman 603-054 is intended for owners and technicians repairing Cadillac, Chevrolet or GMC full-size trucks and SUVs from the covered model years who need an OEM-style replacement coolant reservoir with cap. It’s a practical option when the original tank is cracked, leaking, warped or the mounting points are damaged, and when you want a ready-to-install unit that restores system containment and pressure without modifying the cooling system.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this reservoir include the cap?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—Dorman 603-054 comes with the pressurized cap preinstalled for a complete replacement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How do I confirm this part fits my vehicle?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Enter your vehicle year and trim in the garage tool and check the Confirmed Fit bar and any fitment notes.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":55168555778391,"sku":"B00FY816E2","price":76.1,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/dorman-front-view-reservoir-cap.jpg?v=1790408095","url":"https:\/\/britishgarage.co.uk\/products\/dorman-front-pressurized-coolant-reservoir-with-cap-for-cadillac-chevy-gmc-direct-replacement-thermoplastic","provider":"British Garage","version":"1.0","type":"link"}