To Flush coolant the way they do in Iowa, do the following (IM):

1.    Modify an expansion tank cap to have a lawn hose fitting on the top;
2.    Connect lawn hose to modified cap, remove rad bleeder bolt;
3.    let low pressure water flow from tap through hose;
4.    Catch coolant as it flows from rad, then give up and let it spill
(wipe it up with hay)
5.    When coolant is clear, start engine, keep flushing;
6.    Stop engine, replace bleeder bolt, start engine, run till comes to
full temp.
7.    Remove bleeder bolt. Connect a bicycle pump to another expansion tank
cap (suitably modified) and pump untill about two gallons of water flow out
of rad.
8.    Add two gallons of coolant to expansion tank;
9. Bleed system of bubbles.

It worked for me, by the way, and sounds a lot more complicated than it is.
(sure beats removing hoses)

Your results may vary.

Marshall Ruskin
84 Westy "Iron Igloo"
Winnipeg, Manitoba, Canada
Founding Member of "Vanagon's Anonymous"