Quote:
Originally Posted by andy650
No more than any other water, when mixed with coolant in a sealed system.
Any clean water is fine (inc non hard tap), or make it simple and buy premix.
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Deionised water is unique in having been stripped of ions (positively charged particles) it will do its best to scavenge these back from any metal it comes into contact with. Safest to use premixed and save any left over for topping up system if needed.
Distilled water has just had minerals removed, so will not deposit calcium or other dissolved substances in your cooling system, but is pretty inert otherwise.