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At around 65K miles I tested and added some of the proper Ford coolant revitalizer. Now at 100K what is the recommended service? Test again? Drain and fill each of the two cooling systems? Flush with water and then drain and fill? Is a flush machine needed?

Gone are the days of buying a Prestone tee and splicing it into a heater hose and flushing your engine.
 

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I'd get a dealer service quote just to see what they want. If that's too high, get a case of 50/50 from the parts department, pull the lower hoses and drain, then fill back to the proper levels.
 
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