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No, the cleaning additive is used with straight water, allowed to circulate and then drained, usually multiple times, then the system is flushed with clear water a couple times, then refilled with the proper coolant mix. Some shops, like mine, have fabricated connectors that allow us to run clean hot water thru the entire system for long periods without the engine running for this purpose. Typically, this is a "time and materials" type project, once the source of the intermix in found and fixed.......
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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