I use the turkey baster method. Suck the fluid out and refill with fresh fluid. You won't get all the fluid out of the system using this method. I do this over a few days and I'm good to go.
Personally I don't like running the car while the hose is disconnected as I don't like to see a pump run dry. I also don't like to introduce air into the system but I hear it easy to bleed the system.
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