One thing to remember is the heater acts as a little
radiator. Irony is we only turn on that extra radiator
when it is cold out!
I do not recommend using a "bypass hose" that allows
coolant to circulate if the heater core is removed.
This allows coolant to circulate without being cooled
first before re-entering the engine. Small volume
admittedly, but it may aggravate a marginal cooling
system.
When I have by passed the heater core, not much use
for one in Texas during the summer, I just have bought
end plugs (little caps) from Auto Zone (chain store that
carries the HELP line of products).
Cheers,
Tom
P.S. On my old 510 I had a series of bad STANT thermostats
one summer... kept turning on the heater full blast (new
core, nice and hot) to keep from overheating in stop and
go traffic. A little too warm for me, but didn't blow any
head gaskets!
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