Experimental-Only Content: This information has been updated to the V2.X version of IC².
The most recent version of IC² is V2.8.111.
Coolant is a fluid in IC2 used to make Coolant Cells and to cool a Fluid Reactor.
Coolant is made by enriching water or Distilled Water with Lapis Lazuli Dust in the Canning Machine set to Fluid Enrich mode.
Note: The coolant would either be output into the Canning Machine's output tank or an available Universal Fluid Cell, not both. The GUI is merely an example.
As shown, for every 1000 mB of coolant produced, using normal water requires 8 dust while using Distilled Water only requires 1 dust.
Coolant is primarily used to craft 10k Coolant Cells, but can also be placed in the world for decorative purposes.
Fluid Coolant is also a key component of energy production in the Fluid Reactor, where it is heated into Hot Coolant by the reactor and cooled by a Liquid Heat Exchanger.