Radium Engineering Coolant Tank Kit – Toyota GR Corolla (2023+)

The Radium Engineering Coolant Tank Kit is a premium billet aluminum replacement for the factory plastic coolant reservoir on the Toyota GR Corolla. Designed for performance driving and long-term reliability, this upgrade addresses the weaknesses of OEM plastic tanks while improving cooling system stability, engine bay durability, and overall performance readiness.

Factory plastic coolant reservoirs are designed for cost and weight efficiency, not sustained heat and pressure. Under repeated heat cycles, aggressive driving, or track use, plastic tanks can weaken, crack, or fail without warning. The Radium coolant tank is engineered to eliminate these risks by replacing the factory unit with a motorsport-grade aluminum solution built to withstand extreme thermal and mechanical stress.

Unlike universal aftermarket tanks, the Radium system is designed specifically for the GR Corolla platform. It installs as a direct bolt-on replacement, retains full OEM cooling system functionality, and maintains factory coolant volume. This ensures seamless integration with the factory cooling strategy while delivering significantly improved durability and reliability.

The tank features a compact billet aluminum design that frees up engine bay space and improves service access. Internally, it incorporates a dual-chamber layout with crossover passages and an integrated swirl feature to help remove air from the cooling system and promote consistent coolant flow. These design elements improve cooling system stability during high-load driving conditions.

Constructed from CNC-machined billet aluminum and finished with a durable anodized coating, the Radium coolant tank is suitable for both daily driving and track use. It delivers enhanced thermal stability, long-term durability, and a clean, high-end engine bay appearance, making it one of the most effective cooling upgrades available for the GR Corolla.

Important Note About Radiator Caps

The factory GR Corolla radiator cap does not fit the Radium coolant tank.

A compatible radiator cap is required for proper installation and operation. If you do not already have a compatible cap, we recommend selecting one of the Radium radiator cap options available on this product page.

Choosing the correct pressure rating allows you to tailor cooling system performance for daily driving or high-performance use.

Radiator Cap Options (Recommended Add-On)

If you select a radiator cap, choose the option that best matches your driving style:

• 1.1 Bar Radiator Cap
  Best for daily driving and OEM-like behavior. Maintains factory-style pressure and drivability.

• 1.3 Bar Radiator Cap
  Ideal for performance street builds. Provides increased pressure tolerance and improved cooling stability under spirited driving.

• 1.6 Bar Radiator Cap
  Recommended for track use and high-performance applications. Maximizes pressure resistance and cooling system performance under extreme conditions.

If you already own a compatible radiator cap, you may select the option to purchase the coolant tank without a cap.

Key Features and Benefits

• Direct bolt-on replacement for the factory GR Corolla coolant tank

• CNC-machined billet aluminum construction for superior durability

• Anodized finish for corrosion resistance and long-term reliability

• Retains OEM coolant volume and system functionality

• Compact design frees engine bay space and improves service access

• Dual-chamber internal design with crossover passages

• Integrated swirl feature to reduce air in the cooling system

• Motorsport-grade mounting bracket and hardware included

What’s Included

• Billet aluminum coolant tank assembly

• Aluminum mounting bracket

• Billet adapter fittings

• Overflow hose

• Stainless steel hardware

Radiator cap sold separately unless selected as an add-on.

Fitment

• Toyota GR Corolla (2023+)

Why Upgrade the GR Corolla Coolant Tank?

The factory GR Corolla coolant reservoir is made from plastic, which can degrade over time due to heat, pressure, and vibration. As power levels increase or driving conditions become more demanding, the risk of failure rises.

Upgrading to a billet aluminum coolant tank provides:

• Increased resistance to heat and pressure

• Improved long-term reliability

• Reduced risk of sudden coolant system failure

• Better cooling system stability during aggressive driving

• Enhanced engine bay durability and aesthetics

For GR Corolla owners who drive aggressively, track their vehicles, or plan future performance upgrades, an aluminum coolant tank is a practical and preventative upgrade.

Radium vs OEM vs Aftermarket Coolant Tanks

OEM Plastic Tank

• Designed for cost and weight reduction

• Susceptible to heat degradation and cracking

• Limited long-term durability under performance use

Universal Aftermarket Tanks

• Often require custom mounting or hose routing

• May not retain OEM cooling system behavior

• Inconsistent fitment and integration

Radium Engineering Tank

• Designed specifically for the GR Corolla

• Direct bolt-on installation

• Retains OEM cooling system functionality

• Motorsport-grade materials and engineering

Is This Upgrade Worth It for Daily Driving?

Yes. While the Radium coolant tank is designed with motorsport use in mind, it also provides significant benefits for daily-driven GR Corollas.

Daily driving advantages include:

• Increased reliability over long-term ownership

• Reduced risk of plastic tank failure

• Improved durability in hot climates

• OEM-like integration with enhanced materials

Ideal For

• Stock GR Corolla owners seeking long-term reliability

• Tuned or modified vehicles with increased heat output

• Track-driven or spirited driving builds

• Owners upgrading cooling system components

• Enthusiasts building a high-quality engine bay

Installation Information

Installation is quick and straightforward using factory mounting threads, with no cutting or drilling required.

For step-by-step instructions, view the official installation guide here:
➡️ Installation Instructions (PDF)

Frequently Asked Questions

Does this coolant tank require modifications to install?
No. The Radium coolant tank is designed as a direct bolt-on replacement using factory mounting points and hose connections.

Does it retain factory coolant capacity?
Yes. The tank maintains the same coolant volume and functionality as the OEM reservoir.

Will this improve engine cooling performance?
While it does not increase radiator capacity, it improves cooling system stability and reliability under high heat conditions.

Is this product suitable for track use?
Yes. The Radium coolant tank is designed to withstand the demands of track driving and high-performance applications.

Will this cause any warning lights or errors?
No. The coolant tank does not interfere with sensors or ECU functions.

Do I need to buy a radiator cap?
Yes, unless you already own a compatible cap. The OEM GR Corolla radiator cap does not fit the Radium tank.