Now that winter has arrived in Chicago, I have become motivated to get the
heaters working in my recent Subie conversion.  This has involved draining,
refilling and bleeding the cooling system a few times as I try different
configurations.
  The radiator has a bleed screw, the rear heater has a bleed screw, but the
front heater does not.  I don't understand how the air in the front heater
is ever supposed to get out; it is considerably higher than the heater hoses
which run under the van.  It seems to me that if there is any significant
air in the front heater core it would not transfer heat very well and the
coolant would not circulate the way it should.
  Does anyone have an answer, solution, or some reassurance for me?

Larry A.
'91 GL with EJ22