Aluminum Coolant Overflow Expansion Tank for Ford F-250 F-350 (1999-2004) 5.4L 6.8L

TIG-Welded Aluminum Coolant Expansion Tank for 1999-2004 Ford F-250, F-350 (P131)

What it Does: The Aluminum Coolant Overflow Expansion Tank replaces the failure-prone factory plastic degas bottle on 1999-2004 Ford F-250 and F-350 trucks to eliminate pressurized coolant leaks and prevent engine overheating under load.

The Stock Ford F-250, F-350 Degas Bottle Fatigue

The factory nylon degas bottle installed on the P131 Super Duty platform is subject to continuous pressurized thermal cycling up to 16 psi. Decades of under-hood radiant heat soak cause the molded polypropylene to turn yellow, micro-craze, and embrittle. Structural failure occurs along the molded ultrasonic mid-seams, around the lower outlet hose barb, and across the mounting ear bosses. Under heavy towing conditions, these stress fractures burst, causing rapid pressure loss, boiling over, and cooling system cavitation.

The Engineering Solution

Engineered as a permanent mechanical fix, this tank is fabricated from high-grade sheet aluminum and fully TIG-welded to eliminate vulnerable molded seam points. Aluminum delivers superior heat dissipation and impervious structural integrity against cyclic internal pressure spikes and UV degradation. The reservoir features precision CNC-machined barbed ports and a reinforced filler neck engineered to maintain a hermetic seal with the included pressure cap. It drops directly into the factory P131 mounting location, retaining original hose routing without cutting or modifications.

Technical Specifications

Compatibility

• 1999-2004 Ford F-250 Super Duty 5.4L Modular V8 (Gas)
• 1999-2004 Ford F-250 Super Duty 6.8L Modular V10 (Gas)
• 1999-2004 Ford F-350 Super Duty 5.4L Modular V8 (Gas)
• 1999-2004 Ford F-350 Super Duty 6.8L Modular V10 (Gas)

Frequently Asked Questions

Does this fit the P131 F-250, F-350?

Yes, this is a direct fit for the 1999-2004 Ford F-250 and F-350 equipped with the Modular 5.4L V8 or 6.8L V10 gas engines.

Does this tank work with the late 2004 6C3Z-8A080-B revision bottle?

No, this reservoir specifically replaces early-style OEM tanks (XC3Z-8A080-AA / 2C3Z-8A080-AA) and is not intended for the revised late-2004 hose configuration.

The Ford Heavy-Duty Caliber

A heavy-duty work truck demands cooling reliability when hauling maximum GCWR in severe heat. Upgrading from brittle OEM plastic to reinforced welded aluminum eliminates a known roadside failure point and protects your Modular engine during heavy-duty towing operations.