Aluminum Coolant Overflow Expansion Tank for Ford Excursion (2003-2005) 6.0L

Heavy-Duty Aluminum Coolant Overflow Expansion Tank for 2003-2005 Ford Excursion (U137)

What it Does: The aluminum coolant overflow expansion tank replaces the leak-prone factory plastic degas bottle on the 2003-2005 Ford Excursion to prevent catastrophic seam separation and coolant loss under high cooling system pressures.

The Stock Ford Excursion Plastic Degas Bottle Failure

The factory molded nylon degas reservoir on the U137 chassis is notoriously vulnerable to heat fatigue when paired with the high-pressure cooling loop of the 6.0L Powerstroke V8 (VT365). Extreme thermal cycling degrades the structural integrity of the OEM plastic over time, resulting in stress fractures, stripped neck threads, and seam separation along the ultrasonic weld lines. Under heavy towing loads and high boost pressures, pressure surges cause the stock container to balloon, crack, or vent coolant continuously from the cap.

The Engineering Solution

Fabricated from heavy-gauge, corrosion-resistant sheet aluminum, this direct replacement degas tank is precision TIG welded and pressure tested to eliminate plastic rupture points entirely. The rigid aluminum construction withstands aggressive thermal spikes without warping or degrading under engine bay UV exposure. Designed with factory-aligned hose barbs and precision mounting brackets, it drops straight into the stock location, pairing directly with OEM part numbers 3C3Z-8A080-AE and 6C3Z-8A080-B while maintaining a reliable, leak-free seal under severe operating conditions.

Technical Specifications

Compatibility

• 2003-2005 Ford Excursion Eddie Bauer 6.0L Powerstroke V8 Diesel
• 2003-2005 Ford Excursion Limited 6.0L Powerstroke V8 Diesel
• 2004-2005 Ford Excursion XLS 6.0L Powerstroke V8 Diesel
• 2003-2005 Ford Excursion XLT 6.0L Powerstroke V8 Diesel
• Note: Fits 6.0L Powerstroke diesel applications only. Does not fit 7.3L diesel or gas models.

Frequently Asked Questions

Does this fit the U137 Excursion?

Yes, this is a direct fit for the 2003-2005 Ford Excursion equipped with the 6.0L Powerstroke V8 (VT365) engine.

Are modifications or custom hoses required for installation?

No, this unit is engineered for direct bolt-on installation utilizing the factory mounting holes and standard cooling hoses.

The Ford Heavy-Duty Standard

Built for severe-duty hauling and high-load towing, this all-aluminum expansion tank provides the critical thermal durability required to keep your diesel running reliably across heavy hauls and remote routes.