{"product_id":"gdukop-engine-coolant-overflow-reservoir-tank-with-cap-direct-fit-603-955-for-buick-encore-chevy-trax-heat-resistant-plastic","title":"GDUKOP Engine Coolant Overflow Reservoir Tank with Cap — Direct-Fit 603-955 for Buick Encore \u0026 Chevy Trax, Heat-Resistant Plastic","description":"\u003cp\u003e\u003cstrong\u003eThe GDUKOP 603-955 engine coolant overflow reservoir tank with cap is a direct-fit replacement coolant expansion bottle designed to restore proper coolant level control for compatible Buick Encore and Chevy Trax models.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen an original coolant overflow tank becomes cracked, discolored, or begins to leak, the cooling system can lose the ability to maintain stable coolant levels and pressure. The GDUKOP 603-955 reservoir is manufactured from heat-resistant plastic and built to match OE dimensions and mounting points so you can replace the worn part without trimming, drilling, or adapting hoses. It ships with a matching cap and meets the reference OE numbers used by many service manuals.\u003c\/p\u003e\n\n\u003ch3\u003eWill this reservoir fit my vehicle?\u003c\/h3\u003e\n\u003cp\u003eThis tank is engineered to directly replace the factory unit on specific Buick and Chevrolet small SUVs. Check your model year and engine size against the listed fitment to confirm compatibility before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with Buick Encore: 2013–2021, L4 1.4L engines\u003c\/li\u003e\n  \u003cli\u003eCompatible with Chevrolet Trax: 2013–2021 L4 1.4L and 2013–2019 L4 1.8L engines\u003c\/li\u003e\n  \u003cli\u003eMatches OE reference numbers: 603-955, 13502353, 95201979, 95269001\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this replacement improve cooling system reliability?\u003c\/h3\u003e\n\u003cp\u003eReplacing a damaged overflow reservoir prevents slow coolant loss and reduces the chance of air entering the cooling circuit. The GDUKOP tank holds expansion coolant and allows the system to recover fluid as temperatures change, helping the engine run with a stable coolant level.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDurable, heat-resistant plastic resists cracking under engine bay temperatures\u003c\/li\u003e\n  \u003cli\u003ePrevents leaks that can lead to low coolant warnings or overheating events\u003c\/li\u003e\n  \u003cli\u003eRestores proper coolant recovery and pressure balance across the system\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs installation difficult and what comes in the box?\u003c\/h3\u003e\n\u003cp\u003eThe reservoir replaces the original unit using the same mounting points and hose connections, so most installations require only basic hand tools and minimal mechanical experience. GDUKOP supplies the tank with a cap and designed hose outlets to match factory routing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect replacement—no trimming or modification needed\u003c\/li\u003e\n  \u003cli\u003eIncludes matching threaded cap for a secure seal\u003c\/li\u003e\n  \u003cli\u003eSimple install: disconnect battery, drain small amount of coolant, swap tank, reconnect hoses\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and standards were used to make this tank?\u003c\/h3\u003e\n\u003cp\u003eThe GDUKOP overflow tank is molded from engineered plastics chosen for thermal stability and chemical resistance to common engine coolants. That construction reduces the likelihood of premature failure from heat cycling or coolant exposure.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHeat-resistant plastic construction suitable for under-hood conditions\u003c\/li\u003e\n  \u003cli\u003eResists cracks, warping, and coolant-induced degradation\u003c\/li\u003e\n  \u003cli\u003eManufactured to match factory dimensions and connector placements\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The GDUKOP 603-955 coolant overflow reservoir is ideal for owners, mechanics, and fleet managers who need a reliable, cost-effective replacement for the original expansion tank on Buick Encore and Chevrolet Trax vehicles within the specified years and engine sizes. It's a practical choice if you see coolant loss, visible tank damage, or dashboard coolant warnings and want a straightforward, direct-fit swap to restore proper cooling operation.\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 tank include the cap?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the GDUKOP 603-955 reservoir is supplied with the matching threaded cap.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I install it myself?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — it’s a direct replacement using factory mounting points; basic tools and minimal experience are needed.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"GDUKOP","offers":[{"title":"Default Title","offer_id":55166425170263,"sku":"B0F8B8CP8J","price":52.65,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/gdukop-reservoir-front-view.jpg?v=1790368286","url":"https:\/\/britishgarage.co.uk\/products\/gdukop-engine-coolant-overflow-reservoir-tank-with-cap-direct-fit-603-955-for-buick-encore-chevy-trax-heat-resistant-plastic","provider":"British Garage","version":"1.0","type":"link"}