Well, crap. Another old-wives tale debunked.I lived on the gulf coast for many many years. I was in the Coast Guard there then got out and went to work for a Ford Dealer. Ford certified master tech and also ASE. Never heard of anyone using distilled water in cooling systems in fact, we were told not too. We were told it causes damage to the system.
Why You Should Never Use Distilled Water in Your Cooling System | Rislone
Many people have "heard" that distilled water is the best water to use in a cooling system. This is wrong! Let us tell you why.rislone.com
‘Course, been using premixed coolant for about 50 years, so no straight water’s been involved anyway.