X4XZ Front Engine Coolant Reservoir 603-382 for Ford — Translucent Expansion Tank & Cap

This replacement coolant reservoir (OE# 603-382) and matching surge cap for select Ford vehicles restores the cooling system's ability to collect expanding antifreeze, relieve pressure, and return excess fluid as the engine temperature changes. Built from translucent, heat-resistant plastic and supplied as a complete tank-and-cap package, the part is designed to mirror the fit and function of the original equipment so you can confirm coolant level visually without removing the radiator cover.

How will this reservoir affect my vehicle's cooling performance?

Replacing a cracked or leaking expansion tank with this X4XZ 603-382 unit helps maintain proper coolant volume and system pressure cycles. It prevents coolant loss and supports normal thermal expansion and contraction behavior in the cooling circuit.

• Holds overflow coolant and returns it to the radiator as the engine cools.
• Relieves excess pressure through the included surge cap.
• Translucent material lets you monitor fluid level at a glance.
• Resists engine-bay heat and vibration for reliable service life.

Which Ford models and engines is the 603-382 tank compatible with?

This tank fits a range of Ford compact and midsize vehicles when matching OE numbers are required. Always confirm part numbers and vehicle fitment before purchase to ensure correct application.

• Ford Focus (2012–2018) — 1.0L and 2.0L and select Battery EV variants.
• Ford Escape (2013–2016) — 1.6L models.
• Ford C-Max (2013–2018) — 2.0L models.
• Ford Transit Connect (2014–2016) — 1.6L models.

What are the build details and installation considerations?

The X4XZ tank is manufactured from durable plastic chosen to withstand thermal cycling and road vibration. It arrives as a two-piece package (reservoir plus surge cap), but professional installation is recommended to avoid coolant contamination and ensure proper hose and sensor connections.

• Material: heat-resistant translucent plastic for easy level checks.
• Included: 1 coolant reservoir and 1 surge cap; instructions not included.
• Recommended: install under professional guidance to ensure secure hose clamps and sensor alignment.
• Part numbers replaced: 8V618K218AE, CV6Z8A080A, CV6Z-8A080-A, 603382, BE8Z8100A.

What should I expect after replacing a damaged reservoir?

Once the faulty tank is replaced, you should see stable coolant levels and reduced top-end overheating risk caused by fluid loss or pressure imbalance. Monitor for leaks and verify cap sealing during the first few drives.

• Improved coolant retention and visible level monitoring.
• Less chance of engine overheating due to lost fluid volume.
• Normal pressure relief via the provided surge cap.
• Service life is influenced by installation quality and operating conditions.

Who is this for: The X4XZ 603-382 coolant expansion tank is intended for owners or technicians working on compatible Ford vehicles that need a direct replacement for a cracked, leaking, or otherwise failing reservoir. It is especially useful for drivers who want a cost-effective alternative to OEM parts while retaining the same fit and monitoring convenience; however, this is an aftermarket direct-fit part, so confirm exact OE numbers and have a qualified mechanic perform the swap to ensure correct installation and system bleeding.