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Yes, that's right. You can also flush by repeatedly filling the coolant system and using compressed air at some low pressure, say 10 psi, to force the water out.

Chris, for how long did you flush it? Did you follow the procedure? You should be able to get a clear flow from flushing one time, just keep it going and you can do the radiator separately. The coolant filter is in a bypass loop, so it will take a while for all fluid to pass just one time...