Aluminum Coolant Overflow Expansion Tank for Lincoln LS (2000-2006) 3.0L 3.9L

Heavy-Duty Aluminum Coolant Expansion Tank for 2000-2006 Lincoln LS (DEW98)

What it Does: The Aluminum Coolant Overflow Expansion Tank replaces the failure-prone factory plastic degas reservoir on the 2000-2006 Lincoln LS to eliminate seam leaks, maintain system pressure, and safeguard against severe overheating.

The Stock Lincoln LS Degas Bottle Failure

The OEM plastic coolant reservoir on the DEW98 platform degrades prematurely under continuous thermal cycling. Positioned in tight proximity to the engine block on both the Duratec 30 3.0L V6 and AJ-V8 (AJ30/AJ35) 3.9L V8, radiant underhood heat causes the factory composite to turn yellow, embrittle, and stress-crack. The most common failures occur along the sonic-welded mold seams, hose barbs, and pressurized filler neck. These hairline fractures bleed off cooling system pressure, lower the boiling point of the coolant, and cause air pockets that lead to localized cylinder head overheating.

The Engineering Solution

This reservoir is constructed from heavy-gauge, corrosion-resistant fabricated aluminum designed to handle elevated operating pressures and constant heat soak. Each seam is robotic TIG welded and leak-tested to prevent pressure drop under extreme loads. CNC-machined barbed fittings match OEM hose routing, eliminating the need to modify factory lines. By replacing failure-prone OEM numbers 5W4Z-8A080-AA and XW4Z-8A080-AA with a solid-metal enclosure, it provides a permanent mechanical fix for cooling system depressurization. An integrated billet filler neck and replacement pressure cap ensure a tight seal out of the box.

Technical Specifications

Compatibility

• 2000-2005 Lincoln LS 3.0L V6 (Duratec 30)
• 2000-2006 Lincoln LS 3.9L V8 (AJ30 / AJ35)

Frequently Asked Questions

Does this fit the DEW98 LS?

Yes, this is a direct fit for the 2000-2006 Lincoln LS equipped with the Duratec 30 or AJ30/AJ35 engine.

Does installation require cutting or modifying original coolant hoses?

No, this tank features direct OEM-placement barbs and bracket points that mate directly to factory cooling lines and chassis mounts.

The Lincoln Performance Standard

Engineered to match the high-output demands of Lincoln rear-wheel-drive platforms, this expansion tank provides the structural integrity needed to maintain rock-solid coolant pressure and long-term drivetrain reliability.