Aluminum Coolant Overflow Expansion Tank for Ford Mustang (2019-2023) 2.3L 5.0L 5.2L

Heavy-Duty Aluminum Coolant Overflow Expansion Tank for 2019-2023 Ford Mustang (S550)

What it Does: The Aluminum Coolant Overflow Expansion Tank directly replaces the failure-prone factory plastic degas reservoir on the 2019-2023 Ford Mustang to maintain steady cooling system pressure and eliminate seam separation under elevated under-hood temperatures.

The Stock Ford Mustang Degas Bottle Failure

Factory S550 degas tanks rely on blow-molded nylon composites that deteriorate rapidly under thermal cycling and sustained under-hood temperatures. Operating right beside high-output powerplants—whether the turbocharged 2.3L EcoBoost, high-compression 5.0L Coyote, or high-revving 5.2L Voodoo / Predator architectures—the stock plastic embrittles over time. Repeated expansion and contraction weaken the sonic-welded central split seams and threaded filler neck. Under pressurized track conditions or spirited highway driving, the stock plastic balloons and develops hairline fractures, bleeding off system pressure, dropping boiling thresholds, introducing localized vapor pockets, and venting coolant.

The Engineering Solution

Manufactured entirely from lightweight T-6061 aluminum, this heavy-duty reservoir delivers structural rigidity that fully resists heat soak and cyclic expansion. Every seam is 100% TIG welded and independently pressure-tested to ensure zero weeping or leak path development under elevated cooling pressures. The unit integrates CNC-machined factory-location barb connections, allowing direct retention of OEM bypass and overflow plumbing without routing modifications. Finished in a durable, heat-resistant black powder coat, it resists chemical degradation and eliminates yellowing while maintaining reliable pressurized degas operation. Direct replacement for OEM part number FR3Z-8A080-A.

Technical Specifications

Compatibility

• 2019 - 2023 Ford Mustang EcoBoost 2.3L
• 2019 - 2023 Ford Mustang GT 5.0L V8
• 2019 - 2020 Ford Mustang Bullitt 5.0L V8
• 2021 - 2023 Ford Mustang Mach 1 5.0L V8
• 2019 - 2020 Ford Mustang Shelby GT350 / GT350R 5.2L V8
• 2020 - 2022 Ford Mustang Shelby GT500 5.2L V8

Frequently Asked Questions

Does this fit the S550 Mustang?

Yes, this is a direct fit for the 2019-2023 Ford Mustang equipped with the 2.3L EcoBoost, 5.0L Coyote, or 5.2L V8 engine.

Does this aluminum expansion tank require an aftermarket pressure cap?

No, a replacement high-pressure cap is included directly in the box, though it remains compatible with standard factory-spec pressure caps.

The Ford Muscle Caliber

Engineered to handle sustained high-RPM operation and high cylinder pressures, this aluminum degas tank provides the thermal resilience required to keep your Mustang operating safely at full throttle.