{"product_id":"dorman-pressurized-coolant-reservoir-for-ram-2500-3500-4500-5500-2013-2018-with-cap-direct-fit-heat-resistant","title":"Dorman Pressurized Coolant Reservoir for Ram 2500\/3500\/4500\/5500 (2013–2018) with Cap — Direct-Fit, Heat-Resistant","description":"\u003cp\u003e\u003cstrong\u003eThe Dorman 603-839 is a direct-fit pressurized engine coolant reservoir with cap designed to replace the factory overflow tank on compatible Ram 2500, 3500, 4500, and 5500 models from 2013–2018.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eBuilt for longevity under-the-hood, this replacement coolant reservoir is manufactured from automotive-grade materials to tolerate heat, road vibration, and everyday wear. It’s engineered to match the original part’s mounting points, hose connections, and pressure-handling characteristics so installation is straightforward and performance is consistent with the vehicle’s cooling system design. Always verify fitment by entering your exact trim and model year into the vehicle garage tool before purchase.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the Dorman 603-839 restore my cooling system’s performance?\u003c\/h3\u003e\n\u003cp\u003eReplacing a cracked or leaking reservoir prevents coolant loss, helps maintain correct coolant levels, and preserves system pressure for efficient heat transfer. The reservoir replicates the original part’s capacity and connections so the cooling circuit can operate as intended.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eExact-fit design for matching hose and mount locations\u003c\/li\u003e\n  \u003cli\u003ePressurized cap included to maintain proper system pressure\u003c\/li\u003e\n  \u003cli\u003eRobust material resists cracking from heat and vibration\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I expect during installation?\u003c\/h3\u003e\n\u003cp\u003eInstallation is intended to be simple for anyone comfortable with basic underhood work. The tank is built to align with factory mounting points and hose fittings, minimizing modification or fabrication.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect replacement—matches original mounting points\u003c\/li\u003e\n  \u003cli\u003eHose connections align with factory lines for quick hookup\u003c\/li\u003e\n  \u003cli\u003eMinimal tools required; basic hand tools are usually sufficient\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this part fit my Ram truck and how do I confirm it?\u003c\/h3\u003e\n\u003cp\u003eThis Dorman reservoir is compatible with Ram 2500, 3500, 4500, and 5500 model years 2013–2018, but variations in trim and equipment can affect fit. Use the site’s garage tool or enter your vehicle’s exact make, model, year, and trim to confirm correct fitment before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eLists compatibility with Ram 2500\/3500\/4500\/5500 (2013–2018)\u003c\/li\u003e\n  \u003cli\u003eCheck vehicle trim and equipment in the garage tool for exact match\u003c\/li\u003e\n  \u003cli\u003eContact customer support for help if you’re unsure about fit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the materials and durability features of this reservoir?\u003c\/h3\u003e\n\u003cp\u003eThe tank is made from durable polymers selected to resist high underhood temperatures, chemical exposure, and constant vibration. Dorman’s aftermarket design follows the original part’s form and function to ensure reliable, long-term operation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHigh-temperature-resistant plastic construction\u003c\/li\u003e\n  \u003cli\u003eEngineered to withstand vibration and road stress\u003c\/li\u003e\n  \u003cli\u003eDesigned and tested to mirror factory performance characteristics\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Dorman 603-839 reservoir is intended for owners and technicians who need a dependable, OEM-compatible replacement for a failing or damaged coolant overflow tank on Ram 2500, 3500, 4500, or 5500 trucks from 2013 through 2018. It’s a practical choice for DIY mechanics seeking a straightforward direct-fit repair, fleet managers maintaining uptime, and professional shops replacing worn cooling components without modifying vehicle systems. Confirm vehicle fitment with the garage tool, then install to restore proper coolant containment and system pressure.\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. The Dorman 603-839 is supplied with the pressurized cap included for a complete replacement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I install this myself?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Many owners can. It’s a direct-fit replacement that typically requires basic hand tools and routine coolant handling precautions.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":48087752638622,"sku":"B082P4MDHJ","price":155.84,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/dorman-coolant-reservoir-front-view_32f488b9-910e-44ca-8366-fa5d1fab4931.jpg?v=1785930336","url":"https:\/\/northtrailauto.ca\/products\/dorman-pressurized-coolant-reservoir-for-ram-2500-3500-4500-5500-2013-2018-with-cap-direct-fit-heat-resistant","provider":"North Trail Auto","version":"1.0","type":"link"}