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Q: My Car is due for a coolant change,my friend who is also my mechanic suggested on 1999 Saturn SL2

a super flush with distilled water; over the last 10years I have lost 2 heater cores due to coolant leaks so he wants to leave this in for about a week & then replace the orange coolant along with a new water pump,will leaving the super flush mixture in for such a long time hurt the cooling system?
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A week is pretty long, it may eat through some things. Most of time I see that the orange coolant is the real problem. There are and have been many clsss action law suits over Dexcool, the orange coolant, because in some areas of the country, it turns to a mud and ruins cooling system components. I used to manage a fleet of 600 GM cars, and when we took delivery of new cars, the first thing we did was flush out the Dexcool and use conventional coolant, This solved all our problems. But again, in fairness to Dexcool, in some areas of the country it works fine, it just depends on the composition of the water in your area, because when you top off with some water, a bad chemical reaction can take place. Distilled water is ok, but why not just avoid the real issue and use conventional green coolant? It has worked well for about 100 years.
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