Kim,
Could be a number of things... I suspect you have a small leak from
compression into your cooling system. The place to vent this is in the front
at the radiator. Seems air bubbles collect at the top of the radiator. The
air then pushes the coolant out the back of the system.

Now with your discovery of a loose fitting going to the rear heater, perhaps
that is where you are drawing (or were drawing) air in. Try bleeding the
system again and see if the problem goes away. Think about replacing that
'T' before it separates and cause even bigger problems.

Just my opinion,

tim o'brien
84 WB (that had lots of coolant genrating properties)
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