What about the thermostat? 

Don't you have to remove it first in order to get proper = flow?  Also, what about the heater core?

 

--Snip!--

 

The Flushing procedure:
     1)  With = the engine cold, hook the hose up to the flusing = tee.
     2)  disconnect the return radiator hose going into the water = pump.  This is
     the hose that comes from the = radiator to the water pump.  It is the lower
     hose = located on the dirvers side front of engine going to the water pump.
     Leave all other hose and caps connected.
     3)  Turn on the water and = caputre the coolant that is coming out of the
     = radiator hose.  When the water being collected is clear of coolant and
     sedimaent (About 15 gallons) the system = is flushed.
     4)  Replace radiatior hose.
     5)  Remove hose and install cap = provided with flushing system onto the tee
     (if = preferred, remove tee and replace with short section of metal pipe.)