Aluminum Coolant Overflow Expansion Tank for Chrysler 300 (2005-2010) 2.7L 3.5L 5.7L 6.1L

Heavy-Duty Aluminum Coolant Overflow Expansion Tank for 2005-2010 Chrysler 300 (LX)

What it Does: The aluminum coolant overflow expansion tank replaces the leak-prone factory plastic recovery bottle on the 2005-2010 Chrysler 300 to eliminate pressurized coolant leaks and maintain stable cooling system pressure.

The Stock Chrysler 300 Coolant Reservoir Failure

The factory coolant recovery reservoir on the LX platform operates as a pressurized expansion tank adjacent to the radiator. Continual thermal cycling from the high-heat HEMI and V6 powertrains, combined with standard 16-18 PSI operating pressures, severely degrades the factory blow-molded nylon. Over time, plastic fatigue creates stress micro-fractures along the seam welds, filler necks warp and break their pressure seal, and the lower outlet barb embrittles to the point of shearing, causing sudden coolant loss, overheating, and air intrusion into the cooling jacket.

The Engineering Solution

Fabricated from 0.100-inch (2.5mm) structural sheet aluminum with precision TIG-welded seams, this expansion tank is engineered to withstand extreme thermal expansion and pressure spikes without fatigue. Aluminum exhibits superior tensile strength and will not crack, discolour, or degrade from continuous exposure to 220°F+ ethylene glycol mixtures and underhood UV radiation. Designed with CNC-machined hose fittings and integrated mounting brackets, it bolts directly into the factory location and utilizes OEM hose routings. Direct replacement for OEM part number 4596466AG.

Technical Specifications

Compatibility

• 2005-2010 Chrysler 300 Base / Touring / Limited (2.7L & 3.5L V6)
• 2005-2010 Chrysler 300C (5.7L HEMI V8)
• 2005-2010 Chrysler 300C SRT8 (6.1L HEMI V8)

Frequently Asked Questions

Does this fit the LX 300?

Yes, this is a direct fit for the 2005-2010 Chrysler 300 equipped with the 2.7L, 3.5L, 5.7L HEMI, or 6.1L SRT8 HEMI engine.

Can I reuse the factory cooling lines and mounting hardware?

Yes, this unit features exact-dimension barbs and mounting tabs designed to reuse your stock hoses and factory mounting locations.

The Chrysler Muscle Caliber

Engineered to handle the thermal demands of heavy V6 and high-displacement V8 muscle platforms, this all-aluminum tank provides structural reliability and zero pressure loss under demanding operating conditions.