Radium Engineering Coolant Expansion Tank Kit – Toyota GR Corolla

Upgrade your cooling system with the Radium Engineering billet aluminium coolant expansion tank, designed specifically for the Toyota GR Corolla. This high-performance replacement for the OEM plastic tank is ideal for track and street use, offering improved durability, heat transfer, and long-term reliability.

Overview
The CNC-machined two-piece aluminium construction resists heat fatigue and deformation common in plastic tanks under repeated thermal cycling. Anodised for corrosion resistance and sleek aesthetics, the compact design retains OEM coolant volume while freeing up space in the engine bay.

Internally, the tank features dual chambers with top and bottom crossovers and a swirl pot to promote air separation and efficient deaeration—essential for maintaining cooling efficiency under high-performance driving.

This tank is a direct bolt-in solution using factory mounting points and hoses. No permanent modifications are required.

Key Features

• Direct replacement for OEM plastic tank

• CNC-machined aluminium body

• Improved heat dissipation and strength

• Internal swirl chamber for effective air separation

• Compact design for better engine bay access

• Compatible with OEM and Radium Type-A caps

Vehicle Compatibility
Toyota GR Corolla (All trims and model years)