{"product_id":"bdfhyk-coolant-expansion-reservoir-for-gm-trucks-suvs-oe-fit-polypropylene-replaces-603-102","title":"BDFHYK Coolant Expansion Reservoir for GM Trucks \u0026 SUVs — OE-fit Polypropylene, Replaces 603-102","description":"\u003cp\u003e\u003cstrong\u003eThe BDFHYK Engine Coolant Expansion Reservoir is a direct-replacement overflow tank engineered to restore proper coolant containment and level visibility for compatible GM trucks and SUVs.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis replacement coolant expansion tank fits a range of GM vehicles and replaces OE numbers such as 603-102, 15075118, 15203949 and others, providing a durable polypropylene construction and clear level sight for routine maintenance. Designed as a like-for-like part, it helps you monitor antifreeze levels without removing the radiator cap and reconnects existing hoses and sensors for a straightforward installation.\u003c\/p\u003e\n\n\u003ch3\u003eWhich vehicles does this reservoir work with?\u003c\/h3\u003e\n\u003cp\u003eThis tank is manufactured to match fit for many General Motors full-size trucks and SUVs. Confirm compatibility by checking your vehicle year, model, and the OE number listed on your original part before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible: 2002–2006 Chevrolet Avalanche, Tahoe, Silverado, Suburban (1500\/2500\/3500 HD Classic)\u003c\/li\u003e\n  \u003cli\u003eCompatible: 2003–2006 Cadillac Escalade ESV\/EXT and 2003–2009 Hummer H2\u003c\/li\u003e\n  \u003cli\u003eCompatible: 1999–2007 GMC Yukon XL, Sierra (1500\/2500\/3500 HD Classic)\u003c\/li\u003e\n  \u003cli\u003eReplaces OE numbers: 603-102, 15075118, 15203949, 15778386, 15778387, 15808715, 15808716, 19353731\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow is the build quality and material useful for my cooling system?\u003c\/h3\u003e\n\u003cp\u003eThe reservoir is molded from high-quality polypropylene (PP) chosen for chemical resistance and thermal endurance. That material helps resist warping, cracking, and the degrading effects of antifreeze over time.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePP construction reduces risk of leaks and long-term brittleness\u003c\/li\u003e\n  \u003cli\u003eTransparent sections enable quick visual level checks without radiator cap removal\u003c\/li\u003e\n  \u003cli\u003eOE-grade fitment preserves mounting points, hose connections, and sensor locations\u003c\/li\u003e\n  \u003cli\u003eManufactured to meet performance expectations of original equipment\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 a direct swap using your vehicle’s existing hoses and fittings. The package includes basic instructions to guide hand-tools-level replacement and restore system integrity.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRemove the old tank, transfer any reusable fittings, attach hoses and fasteners\u003c\/li\u003e\n  \u003cli\u003eEnsure proper sensor and cap connections if applicable to your model\u003c\/li\u003e\n  \u003cli\u003eRefill coolant to recommended levels and inspect for leaks after warm-up\u003c\/li\u003e\n  \u003cli\u003eTypical installation time: roughly 30–90 minutes depending on vehicle and experience\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy choose a BDFHYK replacement tank over a used or generic part?\u003c\/h3\u003e\n\u003cp\u003eBDFHYK supplies a new, OE-standard-quality reservoir made on a production line with inspection controls. A fresh tank eliminates uncertainty from age-related damage that can compromise cooling system performance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBrand-new unit avoids hidden cracks, clogged passages, or warped mounting locations\u003c\/li\u003e\n  \u003cli\u003eOE-equivalent dimensions and port locations simplify fitment and reduce modification need\u003c\/li\u003e\n  \u003cli\u003ePackaged with installation guidance to reduce guesswork during replacement\u003c\/li\u003e\n  \u003cli\u003eCustomer support available for questions and issue resolution within 48 hours\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The BDFHYK coolant expansion reservoir is intended for owners and mechanics maintaining older GM full-size trucks and SUVs that need a reliable, ready-to-install overflow tank. It’s suited to DIYers who want a clear visible coolant level, professional shops replacing worn or leaking reservoirs, and anyone replacing a failed OE part with a cost-effective, OE-equivalent unit. Before purchase, verify your vehicle’s model year and OE number to ensure correct fitment.\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 fit my 2005 Chevy Silverado?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes if your Silverado is 2002–2006 HD Classic and your original OE number matches one of the listed replacements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will I need extra parts to install this tank?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Usually no—this is a direct replacement using existing hoses and sensors; only basic hand tools are typically required.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"BDFHYK","offers":[{"title":"Default Title","offer_id":48081348886686,"sku":"B0BPM7K97Z","price":85.69,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/bdfhyk-front-view-reservoir_13d94f4b-1093-4306-89d4-024fcd283aa6.jpg?v=1785800252","url":"https:\/\/northtrailauto.ca\/products\/bdfhyk-coolant-expansion-reservoir-for-gm-trucks-suvs-oe-fit-polypropylene-replaces-603-102","provider":"North Trail Auto","version":"1.0","type":"link"}