MrMagoo Posted August 11, 2015 Report Share Posted August 11, 2015 I need to do a coolant change on my '95 DeVille 4.9L, and I've read where people have said you shouldn't flush the system with water because you might upset the 50/50 mix. Why are they saying that? Because... 1) The factory service manual I have (not Chilton or Haynes) says to flush with water (and I would be using distilled, not tap). 2) If you drain all the water out, how would there be any left to throw the mixture off? 3) The manual warns against "a solution of higher than 70/30 mixture of antifreeze to water", but it doesn't warn against an imbalance the other way. Is there something I'm missing? Quote Link to comment Share on other sites More sharing options...
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