X4XZ Coolant Reservoir Replacement for Ford Expedition & F-150 (2015–2024) - OE Fit, Polypropylene

X4XZ 603-318 is a direct-fit replacement coolant reservoir designed for select Ford Expedition, F-150, Lobo and Lincoln Navigator models from 2015–2024. This replacement engine coolant reservoir (OE FL3Z-8A080-A) restores factory fit and function for vehicles that use the FL3Z-8A080-A tank. Molded from durable polypropylene, the tank provides a visible expansion chamber for coolant so you can monitor level without opening the radiator cap. The unit ships new and ready to install with the goal of matching original equipment performance and long-term durability.

Which vehicles will this coolant reservoir fit?

This reservoir is intended for Ford and Lincoln models that list OE part FL3Z-8A080-A. Common fits include 2018–2024 Ford Expedition, 2015–2024 Ford F-150, 2015–2023 Ford Lobo and 2018–2024 Lincoln Navigator. Always verify compatibility by checking your vehicle’s year, make and part number.

• OE reference: FL3Z-8A080-A (also listed as 603-318, 603318, FL3Z8A080A)
• Primary fit: Expedition (2018–2024), F-150 (2015–2024)
• Also fits: Lobo (2015–2023) and Navigator (2018–2024)
• Confirm fit using your vehicle’s part lookup or fitment filter

How does this reservoir help engine cooling and maintenance?

The expansion tank gives coolant room to expand as the engine warms, preventing overpressure and allowing coolant to return to the system as it cools. Because the tank is translucent, you can check antifreeze level visually and spot leaks early without removing the radiator cap.

• Prevents coolant overflow and reduces pressure spikes
• Visible fluid level helps quick inspections and leak checks
• Designed to match original mounting points for straightforward replacement

What are the build quality and material details?

Constructed from high-grade polypropylene, this reservoir offers chemical resistance and impact tolerance suitable for under-hood conditions. The design follows OE shape and connection points to ensure the same form, fit and function as the factory part.

• Material: durable PP (polypropylene) for heat and chemical resistance
• Manufactured to meet or exceed OE durability standards
• Factory-style ports and mounting locations for easy installation

What comes in the package and what support is available?

Each purchase includes one brand-new engine coolant reservoir expansion tank; mounting hardware and hoses are not included unless specified. X4XZ provides a one-year product service window and customer support to help with fitment or quality questions.

• Package contents: 1 x engine coolant reservoir expansion tank
• No instruction manual included; professional installation recommended if unsure
• After-sales: 24-hour customer service and 1-year product support

This replacement reservoir is best for owners restoring cooling-system reliability after a cracked or leaking tank, technicians performing routine maintenance, and DIYers who want a direct-fit OEM-equivalent part. If your vehicle lists FL3Z-8A080-A as the correct part number, this X4XZ 603-318 tank offers a cost-effective, durable option that keeps the coolant system operating as intended while making fluid level checks faster and safer.

FAQ

Q: Does this reservoir include hoses or cap?

A: No, the package contains only the coolant reservoir tank; hoses and cap are not included.

Q: Is this an exact OEM replacement for part FL3Z-8A080-A?

A: Yes, it is listed to match OE FL3Z-8A080-A and is designed for equivalent form, fit and function.