In a message dated 5/20/00 1:55:39 AM, thewestyman@MINDSPRING.COM writes:

<< One oddity of the Subaru engine is

that the coolant flow to the heater core must be constant, i.e. the flow

cannot be restricted or shut off, as this will cause the engine to run hot

or overheat. Has someone designed or used a three-way valve, or other type

bypass system that will allow the coolant to be closed off as normal, to the

heater core, but at the same time allow the coolant to continue to flow back

to the engine in a completed circuit? Any ideas? Thanks!

Karl M

Westy Ventures >>

Karl,
You have the solution.  A shunt in the loop via a 3-way, 2 position valve
with the CORRECT flow pattern will accomplish what you want.  I checked for
one but, I couldn't find one quickly with hose barbs.  Surely, they are made.
 There is nothing wrong with using a threaded valve with hose bard adapters;
it's just not as svelte.

Another way is to use 2 stop cocks.  That is even less svelte but
accomplishes the same end.  One problem with this hookup, which a 3-way
circumvents, is that someone not familiar with the valving arrangement may
inadvertently shut off the loop.

Rich