[jeffcoslacker]

We used a machine that provides pump and air powered agitation...you install a flushing tee in the heater hose, connect it to the machine, and there is a downspout kind of neck you put in place of the radiator cap. A regular hose supplies water to the machine.

Start the car and run with heater on full (very important, this is where the majority of cooling system crap settles, in the heater core) and when you feel the thermostat open, you open the valve and it pushes the water in through the tee, and the old stuff flushes out of the neck in the radiator. Once it runs clear, you fill a basin on the machine with new coolant, hit the pump, and it pushes the new coolant in, and all the water out the radiator neck. When you see coolant begin to flow out the neck, it's done.

For a really hogged up system you could hit the agitator which pulses the incoming water with air pressure bursts, but that is hard on an older system, so we almost never used it.

Anyway, your solution should have worked pretty well.

Ideally you want to flush AGAINST the direction of normal flow for best effect.