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Moroso Coolant Expansion Tank for 2006-2015 Mazda MX-5 NC

MX-5 Coolant Tank

23993274 - 63779
Direct replacement for your factory plastic coolant expansion tank. Made in the USA, all aluminum TIG welded. Constructed with internal baffles and a machined aluminum neck that takes a factory cap. All of the inlets and outlets are positioned to match up with the factory hoses. The tank mounts to the same location as the factory tank and is built with the same dimensions for an easy fit.
Availability: Dependent on suppliers inventory
Shipping: Drop Shipped. Shipping method dependent on source
Pricing: $311.99
Free U.S. Over $150


As NC's age, the factory plastic tank is a common failure point because the plastic gets brittle and cracks. Unlike the NA and NB cars where that just meant a leak, the NC relies on this tank to be a pressurized part of the cooling system, which means that as soon as a crack forms the system loses pressure and the engine overheats. Mazda made a huge design error by putting the radiator cap on the reservoir. By pressurizing this tank, it is guaranteed it will fail faster than normal. Eliminate this possibility and install a tank that will never fail!


Shipping Information

  • Item Requires Shipping
  • 3.0 lbs.
  • W10.0000” x H7.0000” x L10.0000”
  • Free U.S. Over $150
  • Drop Shipped. Shipping method dependent on source

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