2003 GMC Safari, 4.3L V6, 124,326 miles.
Out: What I assume is a Dex-Cool clone; kind of a yellow/green when drained into a white bucket. Unknown mileage on coolant (the reason for the drain/refill).
Prep: Tap water rinse with hose until clear: radiator, heater core, engine block, reservoir.
In: Prestone Dex-Cool (orange) and distilled water.