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Flush and Fill time
Flushing your system simply means displacing the old coolant mix with fresh water from a garden hose or the like. Loose sediment should come out with it.
Cleaning means adding a chemical that is moderately acidic. The acidic nature of the material eats away at scale and other deposits that may be in your cooling system.
Most service manuals recommend you avoid the cleaners unless you can visibly see scale or other hard crud inside the radiator neck, on the radiator cap or elsewhere.
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