Radium Engineering GR Corolla Coolant Tank Kit

Overview

The Radium Engineering Coolant Tank Kit is a premium aftermarket replacement for the plastic expansion/overflow reservoir on the 2023+ Toyota GR Corolla. Designed for both street and high-performance track use, this kit enhances durability, heat management, and engine bay space over the stock unit.

Durable Billet Construction

• Machined from CNC-billet aluminum and anodized for corrosion resistance, the Radium tank is significantly stronger and more heat-resistant than the OEM plastic reservoir. Its rugged design makes it well suited to sustained thermal cycling and aggressive driving conditions. 

Improved Cooling System Performance

• Aluminum’s superior thermal conductivity helps disperse heat more effectively, while the tank’s internal design featuring two connected chambers and a swirl/air-de-aeration feature helps reduce entrapped air in your cooling system, promoting smoother coolant flow and system efficiency.

Direct Fit with OEM Functionality

• This Radium replacement installs using the factory mounting points and interfaces with existing coolant hoses through included adapter fittings. It retains the same coolant capacity as the stock tank but with a more compact footprint, freeing up valuable engine bay space for other modifications and improving accessibility for maintenance.

Complete Installation Kit

• Two-piece billet aluminum tank

• Custom aluminum mounting bracket

• Billet adapter fittings

• 7/32″ overflow hose

• Stainless steel installation hardware

Note: A pressure cap is not included. The OEM Toyota cap (approx. 1.08 bar) may be reused