Radium 20-0039 Coolant Tank Kit Lotus Elise/Exige 2ZZ-GE Engine Image1
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Radium Coolant Tank Kit Lotus Elise/Exige 2ZZ-GE Engine

  • Replace Faulty Tanks

  • Durable Construction

  • Black Finish

Radium 20-0039 Coolant Tank Kit Lotus Elise/Exige 2ZZ-GE Engine

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Product Details

The Radium Coolant Expansion Swirl Tank features three ports that use -6AN to 9/16-18 O-ring adapters (not tapered pipe threads) for a positive seal. The main tank is a 2-piece design constructed of cast aluminum. The two halves (shown below) are welded together along with a CNC billet aluminum cap receiver which mates to any standard 32mm "import" style pressure cap.

The S2 Lotus Elise, Lotus Exige, and Lotus 2-Eleven comes standard with a Denso coolant expansion tank. This is the same plastic tank that is found in the Toyota 2ZZ-GE equipped vehicles. For fitment, Lotus designed a complex bracket that incorporates a mount for the electric hot-soak water pump. There has been cases reported where the Denso tank has failed and owners have found that new replacements are quite expensive. Radium has simplied the Lotus design by making two separate mounts and further improved it using a robust aluminum tank and adapting the factory hoses to -6AN fittings.

The mount uses all factory threaded mounted holes. Because of this, there is no need to drill or modify anything as it bolts in. Install is a fairly simple process that can be performed by an average mechanic. Everything is accessible with the rear clam intact. Aluminum push lok-hose ends are included to convert the factory coolant hoses into -6AN.

All coolant tanks are pressure tested in house (shown below) and then powder coated texture black.


  • Cast Aluminum Coolant Tank-Powder Coated Black
  • Nickel Plated Sight Tube Fittings
  • Aluminum -6AN O-Ring Adapter Fittings
  • Anodized Black -Aluminum -6AN Hose Ends-Anodized Black
  • Laser Cut Aluminum Tank Bracket-Powder Coated Black
  • Laser Cut Aluminum Hot-Soak Water Pump Bracket
  • Rubber Isolation Coolant Tank Grommets
  • Hot-Soak Water Pump Cushion Clamp
  • Mounting Hardware

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