8V618K218AE Coolant Expansion Tank Fits C-MAX Escape Focus Transit 2012-2018

Product Specification

Product Function Description

The coolant reservoir overflow tank is a critical component of your Ford vehicle's cooling system. This tank, also known as the expansion tank or coolant recovery bottle, stores excess coolant that expands and overflows from the radiator when the engine is hot . When the engine cools down, the vacuum created in the cooling system draws the stored coolant back into the radiator, maintaining proper coolant levels and preventing air from entering the system . For Ford Focus, Escape, C-Max, and Transit Connect models, a properly functioning coolant reservoir ensures consistent engine temperature, prevents overheating, and protects the engine from thermal damage . This component is manufactured to factory specifications, providing reliable performance and durability .

When Should You Replace It?

Consider replacing your coolant reservoir overflow tank if you experience any of the following symptoms:

• Visible coolant leaks around the reservoir or on the ground under the vehicle

• Low coolant level warning light illuminated on the dashboard

• Engine overheating or temperature gauge reading higher than normal

• Cracks, discoloration, or damage visible on the plastic reservoir body

• The reservoir cap does not seal properly or shows signs of wear

• Coolant odor coming from the engine bay without visible external leaks

• The vehicle fails to maintain proper coolant level despite regular refills

Note: Coolant reservoirs are wear items that can become brittle and crack over time due to exposure to heat and thermal cycling . Regular inspection is recommended, and replacement should be performed at the first signs of failure.

Product Attributes

Why Choose This Coolant Reservoir?

Restores Cooling System Function – A cracked or leaking reservoir allows coolant loss and air entry into the system, leading to overheating . This new reservoir restores proper coolant storage and recovery for reliable engine temperature control.

Prevents Engine Overheating – A faulty reservoir can cause low coolant levels, leading to overheating and potential engine damage. Replacing it early helps protect your engine from costly repairs.

Direct Replacement – Precision-engineered to match the original reservoir specifications. Direct bolt-on replacement with correct mounting points – no modifications required.

Quality Construction – Manufactured with durable materials designed to withstand underhood heat, vibration, and repeated thermal cycling .

Proven Compatibility – This reservoir is confirmed compatible with multiple Ford models, including Focus, Escape, C-Max, and Transit Connect, covering various years and engine options .

Essential Maintenance Item – Replacing the coolant reservoir is an affordable maintenance step that helps ensure reliable cooling system operation and prevents unexpected breakdowns.

Package Contents

• 1 × Coolant Reservoir Expansion TankPlease confirm compatibility with your Ford model, year, and engine before purchasing.

Features & Functional Notes

Performance Notes:

• The coolant reservoir is critical for maintaining proper coolant levels and preventing engine overheating.

• A cracked or leaking reservoir can cause low coolant levels, leading to engine overheating.

• Common failure points include cracks in the plastic body, leaking at the seam, or a failing cap seal.

Quality Assurance & Service Commitment

Quality Assurance:
Every component is manufactured under controlled production processes to ensure consistent dimensional accuracy and material integrity. Each unit undergoes the following quality checks before packaging:

• Dimensional inspection – critical mounting points and hose connections are verified against design specifications

• Pressure test – 100% leak tested to ensure proper sealing and pressure retention

• Material integrity check – plastic composition is verified for heat and vibration resistance

• Cap seal test – pressure cap is confirmed for proper sealing

Packaging Protection:
Each coolant reservoir is individually sealed in protective packaging to prevent contamination and physical damage during storage and transit. The packaging includes a clear part number label for easy identification.

Service Commitment:

 Related Product Recommendations

When replacing the coolant reservoir, it is often recommended to inspect and consider replacing the following related components at the same time. These parts share the same cooling system and operating environment.

Recommended Related Parts:

Coolant Hoses – The hoses connected to the reservoir can become brittle over time. Inspect for cracks, swelling, or leaks when replacing the reservoir.

Radiator Cap – Some aftermarket coolant reservoir kits include a new cap. If replacing the reservoir separately, confirm the cap is included. A failing cap can cause pressure loss and overheating.