Aluminum Coolant Overflow Expansion Tank for Dodge Challenger (2009-2010) 3.5L 5.7L 6.1L

Heavy-Duty Aluminum Coolant Overflow Expansion Tank for 2009-2010 Dodge Challenger (LC)

What it Does: The aluminum coolant overflow expansion tank replaces the failure-prone factory plastic reservoir on the 2009-2010 Challenger to eliminate pressurized coolant leaks and prevent cooling system failure caused by engine-bay heat fatigue.

The Stock Dodge Challenger Reservoir Fatigue

The original pressurized recovery bottle on the LC platform is molded from standard polymer plastic that degrades quickly under continuous thermal cycling. Mounted next to the radiator, the reservoir absorbs intense underhood heat soak, resulting in yellowing, material embrittlement, and hairline cracks along the factory sonic-welded seams. Common mechanical failure points include fractured neck threads and sheared hose barbs. Once compromised, the stock reservoir cannot hold system pressure, leading to air ingress, dropped boiling thresholds, coolant loss, and risk of overheating on both V6 and high-displacement V8 platforms.

The Engineering Solution

Engineered as a direct drop-in replacement, this tank is constructed from 0.100-inch thick-wall sheet aluminum to handle continuous cooling system pressures without expanding or splitting. Every seam is precision TIG-welded to ensure structural integrity under elevated pressure cycles. Unlike OEM plastic, raw aluminum does not crack, discolor, or degrade from coolant chemistry or UV exposure. The assembly retains factory hose routing, drops directly into the OEM bracketry, and replaces failure-prone OEM part number 4596466AG.

Technical Specifications

Compatibility

• 2009-2010 Dodge Challenger SE (3.5L V6)
• 2009-2010 Dodge Challenger R/T (5.7L HEMI V8)
• 2009-2010 Dodge Challenger SRT8 (6.1L HEMI V8)

Frequently Asked Questions

Does this fit the LC Challenger?

Yes, this is a direct fit for the 2009-2010 Dodge Challenger equipped with the 3.5L V6, 5.7L HEMI, or 6.1L HEMI engine.

Does this reservoir accept the factory pressure cap?

Yes, the neck is configured to accept the stock-spec pressurized expansion cap and connects directly to factory overflow hoses.

The Dodge Muscle Standard

High-displacement Mopar engines generate substantial heat loads during hard pulls. Upgrading to robust all-aluminum hardware ensures your cooling system withstands heavy throttle without blowing seams or spilling coolant on the track or street.