SYKRSS Engine Coolant Reservoir Tank for Kenworth & Peterbilt 2008–2019 — Direct-Fit Polypropylene

SYKRSS 603-5403 is a direct-fit replacement engine coolant expansion reservoir designed for Kenworth and Peterbilt models from 2008–2019, built to OE standards for reliable coolant storage and recovery.

This SYKRSS coolant overflow tank (OE nos. N5346001, T1673008) is a 100% new polypropylene reservoir engineered to match the original part’s form, fit, and function. It stores excess antifreeze, lets you visually check fluid level without opening the radiator cap, and returns coolant to the cooling system as temperatures normalize. The tank is intended for heavy-duty trucks and is manufactured to withstand heat, vibration, and the operational demands of on-road engines.

How does this reservoir work within my truck’s cooling system?

The expansion tank collects coolant expelled from the radiator when the engine runs hot and coolant volume increases. As the engine cools, the cooled fluid is drawn back into the radiator, maintaining the system’s coolant level without manual topping. It helps prevent overflow onto other components and preserves system pressure balance.

• Accepts excess coolant during thermal expansion.
• Returns cooled fluid to the radiator automatically.
• Provides an external, visible fluid level to avoid unnecessary cap removal.

Will this SYKRSS tank fit my Kenworth or Peterbilt vehicle?

Yes—this unit is built to meet OE specifications and is compatible with many Kenworth and Peterbilt trucks manufactured between 2008 and 2019. Confirm fit by cross-referencing OE numbers N5346001 or T1673008 with your vehicle’s parts list or by comparing mounting points and hose locations to the original tank.

• Direct-fit design to match original mounting and connections.
• OE reference numbers provided for accurate verification.
• Intended for 2008–2019 Kenworth and Peterbilt models—check chassis specifics before ordering.

What materials and durability features does this reservoir offer?

The SYKRSS reservoir is molded from high-quality polypropylene (PP), chosen for its heat resistance and vibration tolerance. That material helps prevent cracking, warping, or premature failure under heavy-duty use. The manufacturing process aims to meet or exceed OE durability expectations for long service life.

• High-temperature resistant polypropylene construction.
• Engineered to resist vibration and thermal cycling.
• Finished and fitted to OEM-style tolerances for reliable sealing and mounting.

What support and warranty come with the SYKRSS coolant tank?

SYKRSS backs this reservoir with a 12-month warranty and responsive customer support. If the tank has manufacturing defects or you encounter fitment issues, contact SYKRSS for troubleshooting, replacement authorization, or guidance within the stated warranty period.

• 12-month limited warranty for manufacturing-related issues.
• Customer support response typically within 48 hours.
• Replacement guidance and assistance with fit verification.

Who is this product for? This SYKRSS 603-5403 coolant expansion tank is suited for fleet managers, maintenance technicians, and owner-operators who service Kenworth and Peterbilt trucks from 2008–2019 and need a dependable, OE-grade replacement part. It’s also appropriate for anyone replacing a cracked or leaking reservoir who wants a direct-fit, durable plastic tank that supports coolant recovery and system integrity without modifying existing hoses or mounts.