Ford EcoSport Focus Fiesta Coolant Reservoir Plug AV618C083AB Genuine

Ford EcoSport, Focus, Fiesta 2011-2018 coolant reservoir plug, genuine part AV618C083AB is a sealing component in the engine cooling system, designed to seal the connection point or blank opening on the coolant reservoir. This part helps prevent coolant from leaking out and limits dust and contaminants from entering the system.

On Ford EcoSport, Ford Focus and Ford Fiesta 2011-2018, the coolant reservoir plug works together with the coolant reservoir, reservoir cap, coolant hoses, radiator and cooling circulation system. When the plug maintains a proper seal, the system can keep coolant levels stable, reduce fluid loss and help the engine maintain a suitable operating temperature.

Part AV618C083AB is an original Ford part, manufactured to the exact dimensions and technical standards of the OEM cooling system. The material is heat resistant and designed for long-term contact with coolant, helping maintain sealing performance under continuously changing temperature and pressure while the engine is running.

After a period of use, the plug may harden, crack, deform or lose sealing ability due to high temperatures and aging. In that case, coolant may leak at the reservoir area, causing the fluid level to gradually drop and possibly leaving water marks or residue around the connection point. If not addressed in time, low coolant levels can affect the engine's ability to control operating temperature.

Product AV618C083AB is manufactured to Ford's genuine standards, ensuring sealing performance, durability and compatibility with the original cooling system of Ford EcoSport, Focus and Fiesta 2011-2018.

Product information

Product name: Coolant Reservoir Plug / Coolant Reservoir Plug
Part number: AV618C083AB/ AV6Z8K103A
Brand: Genuine Ford

Applicable models:

• Ford EcoSport 2014-2020
• Ford Focus 2012-2015
• Ford Fiesta 2011-2018

Installation location: Coolant reservoir
System: Engine cooling system
Condition: New

Functions and role

• Seals the connection point on the coolant reservoir.
• Prevents coolant leaks.
• Limits the entry of dust and contaminants.
• Helps maintain stable coolant levels.
• Supports efficient cooling system operation.

Key benefits

• Genuine Ford part.
• High heat resistance material.
• Stable sealing performance.
• Resistant to coolant exposure.
• Precision design to original specifications.
• Simple installation in the correct position.

Signs it needs inspection or replacement

• Coolant leaks around the reservoir.
• Unusually low coolant level.
• The plug is cracked or deformed.
• The plug has hardened over time.
• Coolant residue appears around the mounting point.
• The cooling system shows signs of fluid loss.

👉 Although the coolant reservoir plug is a small part, it plays an important role in ensuring the cooling system remains sealed. Using the genuine Ford EcoSport, Focus, Fiesta 2011-2018 coolant reservoir plug, part AV618C083AB, helps reduce coolant leaks and maintain stable system operation.

Replacement recommendations

• Replace with the correct AV618C083AB part for the vehicle.
• Check the installation position and contact surface before replacement.
• Inspect the coolant reservoir and surrounding hoses if a leak is found.
• Do not install while the engine is hot to avoid burns from coolant.
• After replacement, recheck coolant level and system leakage.