We have BM's and we skimp on DI water- sheesh. Cmon, people, buy a gallon of DI water for 69 cents, and use it for your coolant dilution. Never use tap/well water unless you know how much hardness/TDS is in that water!
No need to flush unless you know the cooling system is FULL of gunk. Flush is usually not necessary. BUT, DI water is.
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