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Distilled Water in Cooling System - Maybe not. 900

posted by  rhaire on  Wed Feb 12 08:47 CST 2003
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last visit: Mon Aug 4 10:16 CST 2014
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Well not so fast Steve, there is an element of truth to the distilled water as solvent angle. Yes, I was told distilled is a no no in metal systems. This by way of service people who maintain very expensive stainless autoclaves. The problem is not ions and corrosion but rather the solubilization of metal by water containing no ions. I am not sure a car would be affected too much by this solubilization effect, since the water is not flowing through but would come to equilibrium with the dissolved metal in a closed system pretty quickly, but these guys also recommend soft water emphatically. I no longer use distilled water in my cars. You simply can't dismiss the recommendation by competent people in the field though and in principle, when large amounts of water are handled, metal dissolution by distilled water is a problem. I just do not think in an auto cooling system (2 gallons) that you will dissolve too much of the head or block.






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