I thought I answered you on the other forum. Anyway, this one is better.

edit, I didn't read all of your post. Sorry. When I flush my system, I use a "T" in the heater line and the hose connetor that Prestone sells. I start the water and turn on the pump. Run it until the water is clear. I used to remove the knock sensors and pump water in there using a fitting that allows you to attach a garden hose.