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

"Vince P." <vince_pappalardo@OM.CV.HP.COM> wrote:

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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.)

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