{"product_id":"sykrss-engine-coolant-reservoir-tank-603-5403-for-kenworth-peterbilt-polypropylene-direct-fit","title":"SYKRSS Engine Coolant Reservoir Tank 603-5403 for Kenworth \u0026 Peterbilt — Polypropylene Direct-Fit","description":"\u003cp\u003e\u003cstrong\u003eSYKRSS 603-5403 is a direct-fit engine coolant expansion reservoir designed to replace OE N5346001 \/ T1673008 on selected Kenworth and Peterbilt models.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis replacement coolant reservoir is engineered from heat-resistant polypropylene to handle heavy-duty truck cooling cycles while restoring proper coolant overflow and recovery function. It’s built to the original equipment shape and mounting points so installation is straightforward for technicians and owners who service W900, T800, T660, T600 and a range of Peterbilt heavy-duty models. The tank lets you monitor antifreeze level without removing the radiator cap and returns excess fluid to the system as the engine cools.\u003c\/p\u003e\n\n\u003ch3\u003eWhich trucks does this SYKRSS coolant tank fit?\u003c\/h3\u003e\n\u003cp\u003eThe SYKRSS 603-5403 reservoir covers a broad set of late-model Kenworth and Peterbilt trucks. Fitment matches multiple model years for W900, T800, T660, T600 and many Peterbilt variants including 377, 385, 386, 382, 365\/367\/384 and 389.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible OE references: N5346001 and T1673008 (service cross-reference).\u003c\/li\u003e\n  \u003cli\u003eFits Kenworth: W900 (2008–2018), T800 (2008–2018), T660 (2008–2017), T600 (2008–2015).\u003c\/li\u003e\n  \u003cli\u003eFits Peterbilt: 377\/385 (2008–2014), 388 (2008–2015), 386 (2008–2016), 382 (2008–2017), 365\/367\/384 (2008–2018), 389 (2008–2019), 348 (2010–2018).\u003c\/li\u003e\n  \u003cli\u003eAlways confirm fit using vehicle filters or parts diagrams before purchase.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this reservoir handle heat, vibration and coolant exposure?\u003c\/h3\u003e\n\u003cp\u003eThe tank is molded from high-grade polypropylene designed for long-term resistance to hot coolant and the vibrations common in heavy trucks. Its material retains shape and sealing performance under cyclic thermal stress to help prevent leaks and maintain system pressure balance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePP plastic resists heat and chemical exposure from engine antifreeze blends.\u003c\/li\u003e\n  \u003cli\u003eReinforced mounting points mirror OE fit to reduce movement and stress.\u003c\/li\u003e\n  \u003cli\u003eTranslucent body allows visible level checks without opening the radiator cap.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat practical benefits will I notice after installing this replacement tank?\u003c\/h3\u003e\n\u003cp\u003eReplacing a cracked or faded overflow tank restores correct coolant recovery and preserves cooling-system efficiency. You’ll regain a clear sight of coolant level, reduce risk of contamination, and avoid unnecessary coolant loss that can lead to overheating situations.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRestores overflow storage for expanded hot coolant and recovery during cooldown.\u003c\/li\u003e\n  \u003cli\u003eHelps prevent oil dilution and unnecessary wear by maintaining proper coolant volumes.\u003c\/li\u003e\n  \u003cli\u003eImproves diagnostics—quick visual checks of antifreeze level without tools.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I expect during installation and warranty support?\u003c\/h3\u003e\n\u003cp\u003eThe 603-5403 is intended as a direct replacement so installation is often a simple removal-and-replace job using existing hoses and mounting brackets. SYKRSS includes a 12-month warranty and responsive support for fitment or quality questions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned for bolt-on replacement using existing hardware when compatible.\u003c\/li\u003e\n  \u003cli\u003eCheck hose routing and clamp condition; replace clamps if corroded.\u003c\/li\u003e\n  \u003cli\u003eSYKRSS warranty covers manufacturing defects for 12 months; contact support for assistance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Fleet mechanics, owner-operators, and maintenance teams working on Kenworth and Peterbilt heavy trucks who need a reliable OE-form coolant expansion tank. It’s suited to anyone replacing a cracked, discolored, or leaking reservoir who wants OE-alike fit, visible coolant level checks, and a durable polypropylene construction backed by a one-year parts warranty.\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: Is this reservoir a direct OEM replacement?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — it replaces OE numbers N5346001 and T1673008 and is made to match original fit and function.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does SYKRSS offer a warranty on this tank?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the coolant reservoir includes a 12-month warranty and customer support within 48 hours.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"SYKRSS","offers":[{"title":"Default Title","offer_id":48081443979422,"sku":"B0D5L1H835","price":154.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/sykrss-front-view-coolant-reservoir.jpg?v=1785804750","url":"https:\/\/northtrailauto.ca\/products\/sykrss-engine-coolant-reservoir-tank-603-5403-for-kenworth-peterbilt-polypropylene-direct-fit","provider":"North Trail Auto","version":"1.0","type":"link"}