{"product_id":"dorman-pressurized-coolant-reservoir-for-ford-transit-direct-fit-expansion-tank-with-cap","title":"Dorman Pressurized Coolant Reservoir for Ford Transit - Direct-Fit Expansion Tank with Cap","description":"\u003cp\u003e\u003cstrong\u003eDorman 603-844 is a direct-replacement pressurized engine coolant reservoir with cap designed to restore correct coolant containment and overflow control on compatible Ford Transit vehicles.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis replacement expansion tank is engineered to match the original equipment's shape, mounting points and pressure-handling characteristics so it installs cleanly and performs reliably beneath the hood. Manufactured from heat- and vibration-resistant materials, the reservoir includes a properly vented cap and is intended for use on select Ford Transit, Transit-150, Transit-250, Transit-350 and Transit-350 HD model years listed in the fitment guide. Always confirm your vehicle year and trim using the fitment tool before ordering to ensure compatibility.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this replacement reservoir restore cooling system function?\u003c\/h3\u003e\n\u003cp\u003eReplacing a cracked or leaking reservoir prevents coolant loss and helps the cooling system maintain proper pressure and overflow control. The Dorman reservoir aligns with original mounting locations and hose connections so it integrates with the factory cooling loop without modification.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect-fit design mirrors OE shape and mounting points\u003c\/li\u003e\n  \u003cli\u003eIncludes pressurized cap sized for the system's specifications\u003c\/li\u003e\n  \u003cli\u003eRestores sealed overflow and return pathways for coolant\u003c\/li\u003e\n  \u003cli\u003eHelps prevent air entry and coolant leaks under pressure\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy choose a Dorman remanufactured-style part over an aftermarket universal tank?\u003c\/h3\u003e\n\u003cp\u003eDorman focuses on form-and-function replacements that match the original part rather than one-size-fits-all tanks. That means fewer adjustments at installation and less risk of fitment-related leaks or interference with nearby components.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEngineered to the original geometry and hose locations\u003c\/li\u003e\n  \u003cli\u003eBuilt from materials rated for underhood heat and vibration\u003c\/li\u003e\n  \u003cli\u003eBacked by Dorman’s long aftermarket experience for reliability\u003c\/li\u003e\n  \u003cli\u003eDesigned to accept factory cap and sensors where applicable\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I inspect before and during installation?\u003c\/h3\u003e\n\u003cp\u003ePrior to installing the new reservoir, verify that mounting points, hoses and the cap interface match your vehicle. During install, check for clean hose ends, intact clamps and no debris in the cooling passages to ensure a leak-free system.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConfirm part fits your model\/year using the garage fitment tool\u003c\/li\u003e\n  \u003cli\u003eInspect and replace worn clamps and degraded hoses if needed\u003c\/li\u003e\n  \u003cli\u003eDrain and properly dispose of old coolant before removal\u003c\/li\u003e\n  \u003cli\u003eRefill with manufacturer-recommended coolant and bleed air pockets\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow long can I expect the replacement reservoir to last?\u003c\/h3\u003e\n\u003cp\u003eService life depends on operating conditions, coolant chemistry and exposure to extreme heat, but this reservoir is produced from durable materials intended to withstand typical underhood stresses. Routine inspection during scheduled maintenance will help detect issues early.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConstructed from heat- and vibration-resistant plastics\u003c\/li\u003e\n  \u003cli\u003eDesigned to resist cracking from thermal cycling\u003c\/li\u003e\n  \u003cli\u003eProper coolant and maintenance extend service life\u003c\/li\u003e\n  \u003cli\u003eReplace at first signs of leaks, cracks or cap failure\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? Owners or technicians servicing 2015–2019 Ford Transit family vans who need a reliable direct-replacement pressurized coolant reservoir. This part suits professional repair shops, fleet maintainers and DIY mechanics who require an OE-style fit and durable construction to restore proper coolant containment and system pressure control. Confirm vehicle compatibility with the fitment tool before purchasing to ensure a correct match for your Transit model and trim.\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: Will this reservoir fit my 2017 Ford Transit-250?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Possibly — use the vehicle fitment tool with your exact year and trim to confirm compatibility before buying.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the part include the pressure cap?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the Dorman 603-844 includes the pressurized cap sized for the reservoir.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":55171462889815,"sku":"B08M4CM2PT","price":81.43,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/dorman-coolant-reservoir-front-view_999e0939-750c-4088-999e-c25d68f687a3.jpg?v=1790446357","url":"https:\/\/britishgarage.co.uk\/products\/dorman-pressurized-coolant-reservoir-for-ford-transit-direct-fit-expansion-tank-with-cap","provider":"British Garage","version":"1.0","type":"link"}