Aluminum Coolant Overflow Expansion Tank for Dodge Magnum (2005-2008) 2.7L 3.5L 5.7L 6.1L

Heavy-Duty Aluminum Coolant Overflow Expansion Tank for 2005-2008 Dodge Magnum (LX)

What it Does: The Aluminum Coolant Overflow Expansion Tank replaces the leak-prone factory plastic recovery bottle on the 2005-2008 Dodge Magnum to eliminate pressurized seam ruptures and maintain consistent cooling system pressure.

The Stock Dodge Magnum Pressurized Reservoir Failure

On the LX platform, the factory cooling system utilizes a pressurized degas bottle positioned adjacent to the radiator. The OEM molded plastic reservoir degrades rapidly under extreme thermal cycling and engine bay radiant heat. Over time, plastic fatigue causes seam delamination, microscopic stress fractures, warped neck threads, and sheared heater hose nipples. When structural integrity fails, the system depressurizes, venting pressurized ethylene glycol, inducting atmospheric air into the water jackets, and inducing localized boiling or severe cylinder head overheating across both LH V6 and HEMI V8 platforms.

The Engineering Solution

This high-strength expansion tank is fabricated from heavy-gauge .100-inch sheet aluminum, engineered to withstand extreme continuous hydraulic pressure spikes without deformation. Featuring precision TIG-welded structural seams and CNC-machined barbed inlet and outlet fittings, it resists UV embrittlement, coolant corrosion, and structural heat fatigue. The reinforced filler neck ensures positive pressure cap sealing, preserving cooling system boiling points under demanding load conditions while integrating directly into factory mounting provisions without hose modification.

Technical Specifications

Compatibility

• 2005 - 2008 Dodge Magnum SE 2.7L V6 (EER)
• 2005 - 2008 Dodge Magnum SXT 3.5L V6 (EGG)
• 2005 - 2008 Dodge Magnum R/T 5.7L HEMI V8 (EZB)
• 2006 - 2008 Dodge Magnum SRT8 6.1L HEMI V8 (ESF)

Frequently Asked Questions

Does this fit the LX Magnum?

Yes, this is a direct fit for the 2005-2008 Dodge Magnum equipped with the 2.7L, 3.5L, 5.7L HEMI, or 6.1L SRT8 engine.

Does this aluminum expansion tank reuse the factory pressure cap?

Yes, the neck is engineered to mate directly with the OEM 16-18 PSI pressure relief cap and stock routing hoses.

The Dodge Muscle Standard

Engineered to handle the aggressive thermal demands of high-displacement American muscle, this aluminum expansion tank prevents catastrophic coolant venting whether idling in traffic or running wide-open throttle down the drag strip.