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Message: <blockquote data-quote="steve twyver" data-source="post: 560496" data-attributes="member: 62196">I did it a while back.  Bought 4 or 5 gallons of distilled water from the Walmart for about $5 and bought a gallon of Prestone (Expensive) Extended life stuff that mixes with everything.  Then drained the antifreeze and added about 1 gallon distilled.  Drove it 3 miles to full temp and then  drained it again after each time.  My math is as follows:Original mix is 50%after 1 run/drain with 1 gallon distilled - new content is 25%after 2nd run/drain/refill content is 12%after 3 runs/drain/refill content is 6%after 4 runs/drain/refill content is 3%.This was good enough for me and close enough to pure water.  Then I drained it a final time and added 1 gallon expensive antifreeze to get to 50%.   I carefully scrubbed out and drained the overflow.  I refilled that with 50-50 mixture.  Someone here mentioned replacing the thermostat and I wish I had, but I'm sure it will be OK.  You don't want to leave pure water in the block any longer than necessary because it will cause rust quickly.  Biggest problem was recyling the old antifreeze.  It's considered hazardous waste.</blockquote>